Zehui Huang - Academia.edu (original) (raw)
Papers by Zehui Huang
Geophysical Research Letters, 1990
... Hidetoshi Shibuya. Department of Earth Sciences, University of Osaka Prefecture, Sakai, Japan... more ... Hidetoshi Shibuya. Department of Earth Sciences, University of Osaka Prefecture, Sakai, Japan. Jih‐Ping Shyu. Department of Oceanography, Texas A&M University. Renato U. Solidum. Philippine Institute of Volcanology and Seismology, Quezon City, Philippines. Piera Spadea ...
Geophysical Research Letters, 1990
Holes were drilled at three Sites in the Sulu Sea on Ocean Drilling Program Leg 124. Site 768 lie... more Holes were drilled at three Sites in the Sulu Sea on Ocean Drilling Program Leg 124. Site 768 lies in the deeper part of the SE sub-basin and Sites 769 and 771 lie on the flanks of the Cagayan ridge. The results indicate that the Sulu Basin originated in the late early Miocene (c.18.8 Ma) in a backarc setting. The
Aapg Bulletin, 1996
Quantitative statements of the evolution of petroleum systems in the Jeanne d'Arc Basin provi... more Quantitative statements of the evolution of petroleum systems in the Jeanne d'Arc Basin provides a solid basis for future exploration, reservoir modelling, reservoir development and resource management. As a contribution to such statements, we have integrated physical property measurements (porosity and permeability) and well log data from the major reservoir intervals throughout the basin using an efficient backpropagation artificial neural
Oceanic crust at Sites 767 and 770 in the northern Celebes Sea is overlain by Eocene and Oligocen... more Oceanic crust at Sites 767 and 770 in the northern Celebes Sea is overlain by Eocene and Oligocene pelagic sediments. Brown clay accumulated below the calcite compensation depth (CCD) at the deeper Site 767 throughout this time interval. At the shallower Site 770, nannofossil clay accumulated just above the CCD during middle to late Eocene and early Oligocene time, interrupted
Tectonophysics, 1994
In an effort to understand the present-day thermal structure of the Jeanne d'Arc Basin, we derive... more In an effort to understand the present-day thermal structure of the Jeanne d'Arc Basin, we derive matrix thermal conductivity values, using a geometric mean model, from thermal conductivity values of thirteen lithologic end-members (of which seven are measurements on materials from the Jeanne d'Arc Basin) and lithological data. Temperature corrections to thermal conductivity are made for both matrix and pore water. In-situ thermal conductivities were obtained after correcting for the effect of porosity, which we estimated from both lithological information and digital well logs. Calculated thermal conductivities of the formations range from 1.46 to 2.65 W m -1K -1. The heterogeneity of formation thermal conductivity is caused by at least two factors. The first is lithological variation due to facies change. The second is due to different degrees of compaction. Under-compacted intervals (overpressure zones) are characteristically of lower thermal conductivity. The surface heat flow density calculated with an inverse method in seventeen wells varies from 37.8 to 60.7 mW/m 2. This study indicates that surface heat flow density values estimated without porosity corrections may be 15% higher than those with porosity corrections. We also demonstrate the sensitivity of modelled timing of maturation to thermal conductivity estimations.
Marine and Petroleum Geology, 1996
A data-based approach is used to establish detailed and accurate geochemical characterization in ... more A data-based approach is used to establish detailed and accurate geochemical characterization in oil source rock intervals, using well logs and noisy information from cuttings. The method starts by extracting examples from the intervals of interest, using generalized relationships between total organic content (TOC) and well log responses. The examples were used to train an artificial neural network (ANN) that
Can J Earth Sci, 1993
ABSTRACT Three sequencing methods were used to calculate the most likely biozonation and the peri... more ABSTRACT Three sequencing methods were used to calculate the most likely biozonation and the periodicity of sedimentary cycles in Lower Cretaceous pelagic strata of the Atlantic and Indian oceans.A database was built of 378 first and last stratigraphic occurrences of calcareous nannofossils, dinocysts, foraminifers, and geomagnetic reversals in highest Jurassic through Lower Cretaceous deep marine strata at 10 Atlantic Ocean and 3 Indian Ocean drilling sites. There are 135 different events in total, about one third of which are unique to either ocean. Using the complete data set, the quantitative stratigraphy methods STRATCOR and RASC calculated closely comparable optimum sequences of average first- and last-occurrence positions. The preferred zonal solution, based on the STRATCOR method, includes 56 events, each of which occurs at three or more sites. The events comprise 6 geomagnetic reversals, 25 nannofossils, 5 planktonic foraminifera, 8 benthic foraminifera, and 12 dinocysts occurrences. Nine assemblage zones have been recognized of Tithonian through Albian age. All but 2 of 18 nannofossil events in the Atlantic Ocean optimum sequence were reported in the same stratigraphic order in a standard Mesozoic nannofossil zonation.Our quantitative examination, using Walsh spectral analysis, of the Lower Cretaceous cyclic sequences at three Deep Sea Drilling Project (DSDP) sites in the Atlantic Ocean generally supports the hypothesis that they are the product of cyclic climatic changes controlled by the Milankovitch orbital cycles. The peaks in the power spectra usually can be related to obliquity and precession cycles; some peaks seem to correspond to the eccentricity cycle. Obliquity seems to be the most important and persistent orbital element responsible for cyclic sedimentation in the Early Cretaceous Atlantic Ocean.The actual pelagic sedimentation rates were calculated for some cores using the results of spectral analysis. The correlation of the actual pelagic sedimentation rate with cyclic patterns and the occurrence of calcareous turbidites indicate that the changes in cycle pattern are the reflection of changes in the oceanographic setting. The changes in oceanographic setting are related to relative-sea-level fluctuations. The intervals dominated by laminated limestone were deposited during higher sea-level periods.
Based on the chronostratigraphy and porosity of the sediments recovered from ODP Sites 767 and 76... more Based on the chronostratigraphy and porosity of the sediments recovered from ODP Sites 767 and 768 drilled in the Celebes Sea and Sulu Sea, respectively, we examine the decompacted sedimentation and basement subsidence rates using a quantitative method. The results of this study help us to recognize several important tectonic events in these two marginal basins which improve understanding of the regional tectonic development. Among the recognized events are: (1) a pronounced increase in decompacted sedimentation rate in the Celebes Sea at 23.4 Ma, indicating basin transformation from a larger, more open oceanic setting to a marginal basin; (2) an increased basement subsidence rate in both basins between 10.8 and 8.9 Ma associated with the initiation of the Sulu Trough and the Sulawesi Trough; (3) appearance of a decompacted sedimentation rate peak between 10.0 and 8.9 Ma in both basins, indicating the combined effect of tectonic uplift in the source area and a sea-level drop; (4) up...
Geochronology, Time Scales, and Global Stratigraphic Correlation, 1995
Well-developed early Campanian to early Maastrichtian pelagic cyclic sediments were recovered fro... more Well-developed early Campanian to early Maastrichtian pelagic cyclic sediments were recovered from Hole 762C on the Exmouth Plateau, off northwest Australia during Ocean Drilling Program (ODP) Leg 122. The cycles consist of nannofossil chalk (light beds) and clayey nannofossil chalk (dark beds), which are strongly to moderately bioturbated, alternating on a decimetre scale, and exhibit gradual boundaries. Trace fossils, which introduced material from a bed of one colour into an underlying bed of another colour, and differences in composition between the light and dark beds indicate that the cycles in these sediments are a depositional feature rather than a diagenetic outcome.Walsh spectral analysis was applied to the upper Campanian–lower Maastrichtian cyclic sediments to examine the regularity of the cycles. With an average sedimentation rate of 1.82 cm/ka in this interval, the most predominant wavelengths of the colour cycles yield periods of around 21 ka and 41 ka, respectively, ...
Well-developed Campanian to Maestrichtian pelagic cyclic sediments were recovered from Hole 762C ... more Well-developed Campanian to Maestrichtian pelagic cyclic sediments were recovered from Hole 762C on the Exmouth Plateau, off northwest Australia, during Ocean Drilling Program Leg 122. The cycles consist of nannofossil chalk (light beds) and clayey nannofossil chalk (dark beds). Both light and dark beds are strongly to moderately bioturbated, alternate on a decimeter scale, and exhibit gradual boundaries. Bioturbation introduces materials from a bed of one color into an underlying bed of another color, indicating that diagenesis is not responsible for the cyclicity. Differences in composition between the light and dark beds, revealed by calcium carbonate measurement and X-ray diffraction analysis, together with trace fossil evidence, indicate that the cycles in the sediments are a depositional feature. Diagenetic processes may have intensified the appearance of the cycles. Spectral analysis was applied to the upper Campanian to lower Maestrichtian cyclic sediments to examine the reg...
A database was built of 378 stratigraphic events, including first and last stratigraphic occurren... more A database was built of 378 stratigraphic events, including first and last stratigraphic occurrences (FO/LO) of calcareous nannofossils, foraminifers, and dinocysts, and geomagnetic reversal occurrences in Latest Jurassic through Early Cretaceous deep-marine strata of 10 Atlantic and three Indian Ocean drilling sites. A total 136 different events are included, about one-third of which are unique to either ocean; however, this number may decrease when more Indian Ocean ODP sites become available for study. Using the complete data set, with the quantitative stratigraphy methods STRATCOR and RASC, we calculated closely comparable optimum sequences of average first and last occurrence positions. The preferred zonal solution, based on the STRATCOR method, includes 56 events, each of which occurs in 3 or more sites and comprises 6 geomagnetic reversal events, 25 nannofossils, 5 planktonic and 8 benthic foraminifers, and 12 dinocysts. Eight assemblage zones of Tithonian through Albian age ...
Oceanic crust at Sites 767 and 770 in the northern Celebes Sea is overlain by Eocene and Oligocen... more Oceanic crust at Sites 767 and 770 in the northern Celebes Sea is overlain by Eocene and Oligocene pelagic sediments. Brown clay accumulated below the calcite compensation depth (CCD) at the deeper Site 767 throughout this time interval. At the shallower Site 770, nannofossil clay accumulated just above the CCD during middle to late Eocene and early Oligocene time, interrupted by a brief episode of noncalcareous clay deposition in earliest Oligocene time. Depth backtracking of these sites and the alternation of calcareous and noncalcareous sediments at Site 770 indicate that an abrupt lowering of the CCD by as much as 500 m occurred in the Celebes Sea region in earliest Oligocene time. This event was synchronous with an equally abrupt but larger-magnitude drop in the CCD in the Pacific and Atlantic Oceans, which has been attributed to changes in ocean circulation, increasing biological productivity, and the accelerated influx of cold Antarctic Bottom Water into the deep ocean basins...
Petroleum Geoscience, 1997
Page 1. Determination of porosity and permeability in reservoir intervals by artificial neural ne... more Page 1. Determination of porosity and permeability in reservoir intervals by artificial neural network modelling, offshore eastern Canada Zehui Huang* and Mark A. Williamson Geological Survey of Canada (Atlantic), PO Box 1006, Dartmouth, NS, Canada B2Y 4A2 ...
Marine and Petroleum Geology, 1994
Marine and Petroleum Geology, 1996
ABSTRACT A data-based approach is used to establish detailed and accurate geochemical characteriz... more ABSTRACT A data-based approach is used to establish detailed and accurate geochemical characterization in oil source rock intervals, using well logs and noisy information from cuttings. The method starts by extracting examples from the intervals of interest, using generalized relationships between total organic content (TOC) and well log responses. The examples were used to train an artificial neural network (ANN) that extracted more detailed and accurate relationships between TOC and well-log responses specific to the study area. A combination of the ‘quickprop’ algorithm and ‘Dynamic Node Creation’ scheme was utilized to facilitate efficient training. The trained ANN is useful for mapping source rock intervals in the area of interest. This method performs satisfactorily when applied to the Egret source rock of the Jeanne d'Arc Basin, offshore eastern Canada.
Marine and Petroleum Geology, 1996
Geophysical Research Letters, 1990
... Hidetoshi Shibuya. Department of Earth Sciences, University of Osaka Prefecture, Sakai, Japan... more ... Hidetoshi Shibuya. Department of Earth Sciences, University of Osaka Prefecture, Sakai, Japan. Jih‐Ping Shyu. Department of Oceanography, Texas A&M University. Renato U. Solidum. Philippine Institute of Volcanology and Seismology, Quezon City, Philippines. Piera Spadea ...
Geophysical Research Letters, 1990
Holes were drilled at three Sites in the Sulu Sea on Ocean Drilling Program Leg 124. Site 768 lie... more Holes were drilled at three Sites in the Sulu Sea on Ocean Drilling Program Leg 124. Site 768 lies in the deeper part of the SE sub-basin and Sites 769 and 771 lie on the flanks of the Cagayan ridge. The results indicate that the Sulu Basin originated in the late early Miocene (c.18.8 Ma) in a backarc setting. The
Aapg Bulletin, 1996
Quantitative statements of the evolution of petroleum systems in the Jeanne d'Arc Basin provi... more Quantitative statements of the evolution of petroleum systems in the Jeanne d'Arc Basin provides a solid basis for future exploration, reservoir modelling, reservoir development and resource management. As a contribution to such statements, we have integrated physical property measurements (porosity and permeability) and well log data from the major reservoir intervals throughout the basin using an efficient backpropagation artificial neural
Oceanic crust at Sites 767 and 770 in the northern Celebes Sea is overlain by Eocene and Oligocen... more Oceanic crust at Sites 767 and 770 in the northern Celebes Sea is overlain by Eocene and Oligocene pelagic sediments. Brown clay accumulated below the calcite compensation depth (CCD) at the deeper Site 767 throughout this time interval. At the shallower Site 770, nannofossil clay accumulated just above the CCD during middle to late Eocene and early Oligocene time, interrupted
Tectonophysics, 1994
In an effort to understand the present-day thermal structure of the Jeanne d'Arc Basin, we derive... more In an effort to understand the present-day thermal structure of the Jeanne d'Arc Basin, we derive matrix thermal conductivity values, using a geometric mean model, from thermal conductivity values of thirteen lithologic end-members (of which seven are measurements on materials from the Jeanne d'Arc Basin) and lithological data. Temperature corrections to thermal conductivity are made for both matrix and pore water. In-situ thermal conductivities were obtained after correcting for the effect of porosity, which we estimated from both lithological information and digital well logs. Calculated thermal conductivities of the formations range from 1.46 to 2.65 W m -1K -1. The heterogeneity of formation thermal conductivity is caused by at least two factors. The first is lithological variation due to facies change. The second is due to different degrees of compaction. Under-compacted intervals (overpressure zones) are characteristically of lower thermal conductivity. The surface heat flow density calculated with an inverse method in seventeen wells varies from 37.8 to 60.7 mW/m 2. This study indicates that surface heat flow density values estimated without porosity corrections may be 15% higher than those with porosity corrections. We also demonstrate the sensitivity of modelled timing of maturation to thermal conductivity estimations.
Marine and Petroleum Geology, 1996
A data-based approach is used to establish detailed and accurate geochemical characterization in ... more A data-based approach is used to establish detailed and accurate geochemical characterization in oil source rock intervals, using well logs and noisy information from cuttings. The method starts by extracting examples from the intervals of interest, using generalized relationships between total organic content (TOC) and well log responses. The examples were used to train an artificial neural network (ANN) that
Can J Earth Sci, 1993
ABSTRACT Three sequencing methods were used to calculate the most likely biozonation and the peri... more ABSTRACT Three sequencing methods were used to calculate the most likely biozonation and the periodicity of sedimentary cycles in Lower Cretaceous pelagic strata of the Atlantic and Indian oceans.A database was built of 378 first and last stratigraphic occurrences of calcareous nannofossils, dinocysts, foraminifers, and geomagnetic reversals in highest Jurassic through Lower Cretaceous deep marine strata at 10 Atlantic Ocean and 3 Indian Ocean drilling sites. There are 135 different events in total, about one third of which are unique to either ocean. Using the complete data set, the quantitative stratigraphy methods STRATCOR and RASC calculated closely comparable optimum sequences of average first- and last-occurrence positions. The preferred zonal solution, based on the STRATCOR method, includes 56 events, each of which occurs at three or more sites. The events comprise 6 geomagnetic reversals, 25 nannofossils, 5 planktonic foraminifera, 8 benthic foraminifera, and 12 dinocysts occurrences. Nine assemblage zones have been recognized of Tithonian through Albian age. All but 2 of 18 nannofossil events in the Atlantic Ocean optimum sequence were reported in the same stratigraphic order in a standard Mesozoic nannofossil zonation.Our quantitative examination, using Walsh spectral analysis, of the Lower Cretaceous cyclic sequences at three Deep Sea Drilling Project (DSDP) sites in the Atlantic Ocean generally supports the hypothesis that they are the product of cyclic climatic changes controlled by the Milankovitch orbital cycles. The peaks in the power spectra usually can be related to obliquity and precession cycles; some peaks seem to correspond to the eccentricity cycle. Obliquity seems to be the most important and persistent orbital element responsible for cyclic sedimentation in the Early Cretaceous Atlantic Ocean.The actual pelagic sedimentation rates were calculated for some cores using the results of spectral analysis. The correlation of the actual pelagic sedimentation rate with cyclic patterns and the occurrence of calcareous turbidites indicate that the changes in cycle pattern are the reflection of changes in the oceanographic setting. The changes in oceanographic setting are related to relative-sea-level fluctuations. The intervals dominated by laminated limestone were deposited during higher sea-level periods.
Based on the chronostratigraphy and porosity of the sediments recovered from ODP Sites 767 and 76... more Based on the chronostratigraphy and porosity of the sediments recovered from ODP Sites 767 and 768 drilled in the Celebes Sea and Sulu Sea, respectively, we examine the decompacted sedimentation and basement subsidence rates using a quantitative method. The results of this study help us to recognize several important tectonic events in these two marginal basins which improve understanding of the regional tectonic development. Among the recognized events are: (1) a pronounced increase in decompacted sedimentation rate in the Celebes Sea at 23.4 Ma, indicating basin transformation from a larger, more open oceanic setting to a marginal basin; (2) an increased basement subsidence rate in both basins between 10.8 and 8.9 Ma associated with the initiation of the Sulu Trough and the Sulawesi Trough; (3) appearance of a decompacted sedimentation rate peak between 10.0 and 8.9 Ma in both basins, indicating the combined effect of tectonic uplift in the source area and a sea-level drop; (4) up...
Geochronology, Time Scales, and Global Stratigraphic Correlation, 1995
Well-developed early Campanian to early Maastrichtian pelagic cyclic sediments were recovered fro... more Well-developed early Campanian to early Maastrichtian pelagic cyclic sediments were recovered from Hole 762C on the Exmouth Plateau, off northwest Australia during Ocean Drilling Program (ODP) Leg 122. The cycles consist of nannofossil chalk (light beds) and clayey nannofossil chalk (dark beds), which are strongly to moderately bioturbated, alternating on a decimetre scale, and exhibit gradual boundaries. Trace fossils, which introduced material from a bed of one colour into an underlying bed of another colour, and differences in composition between the light and dark beds indicate that the cycles in these sediments are a depositional feature rather than a diagenetic outcome.Walsh spectral analysis was applied to the upper Campanian–lower Maastrichtian cyclic sediments to examine the regularity of the cycles. With an average sedimentation rate of 1.82 cm/ka in this interval, the most predominant wavelengths of the colour cycles yield periods of around 21 ka and 41 ka, respectively, ...
Well-developed Campanian to Maestrichtian pelagic cyclic sediments were recovered from Hole 762C ... more Well-developed Campanian to Maestrichtian pelagic cyclic sediments were recovered from Hole 762C on the Exmouth Plateau, off northwest Australia, during Ocean Drilling Program Leg 122. The cycles consist of nannofossil chalk (light beds) and clayey nannofossil chalk (dark beds). Both light and dark beds are strongly to moderately bioturbated, alternate on a decimeter scale, and exhibit gradual boundaries. Bioturbation introduces materials from a bed of one color into an underlying bed of another color, indicating that diagenesis is not responsible for the cyclicity. Differences in composition between the light and dark beds, revealed by calcium carbonate measurement and X-ray diffraction analysis, together with trace fossil evidence, indicate that the cycles in the sediments are a depositional feature. Diagenetic processes may have intensified the appearance of the cycles. Spectral analysis was applied to the upper Campanian to lower Maestrichtian cyclic sediments to examine the reg...
A database was built of 378 stratigraphic events, including first and last stratigraphic occurren... more A database was built of 378 stratigraphic events, including first and last stratigraphic occurrences (FO/LO) of calcareous nannofossils, foraminifers, and dinocysts, and geomagnetic reversal occurrences in Latest Jurassic through Early Cretaceous deep-marine strata of 10 Atlantic and three Indian Ocean drilling sites. A total 136 different events are included, about one-third of which are unique to either ocean; however, this number may decrease when more Indian Ocean ODP sites become available for study. Using the complete data set, with the quantitative stratigraphy methods STRATCOR and RASC, we calculated closely comparable optimum sequences of average first and last occurrence positions. The preferred zonal solution, based on the STRATCOR method, includes 56 events, each of which occurs in 3 or more sites and comprises 6 geomagnetic reversal events, 25 nannofossils, 5 planktonic and 8 benthic foraminifers, and 12 dinocysts. Eight assemblage zones of Tithonian through Albian age ...
Oceanic crust at Sites 767 and 770 in the northern Celebes Sea is overlain by Eocene and Oligocen... more Oceanic crust at Sites 767 and 770 in the northern Celebes Sea is overlain by Eocene and Oligocene pelagic sediments. Brown clay accumulated below the calcite compensation depth (CCD) at the deeper Site 767 throughout this time interval. At the shallower Site 770, nannofossil clay accumulated just above the CCD during middle to late Eocene and early Oligocene time, interrupted by a brief episode of noncalcareous clay deposition in earliest Oligocene time. Depth backtracking of these sites and the alternation of calcareous and noncalcareous sediments at Site 770 indicate that an abrupt lowering of the CCD by as much as 500 m occurred in the Celebes Sea region in earliest Oligocene time. This event was synchronous with an equally abrupt but larger-magnitude drop in the CCD in the Pacific and Atlantic Oceans, which has been attributed to changes in ocean circulation, increasing biological productivity, and the accelerated influx of cold Antarctic Bottom Water into the deep ocean basins...
Petroleum Geoscience, 1997
Page 1. Determination of porosity and permeability in reservoir intervals by artificial neural ne... more Page 1. Determination of porosity and permeability in reservoir intervals by artificial neural network modelling, offshore eastern Canada Zehui Huang* and Mark A. Williamson Geological Survey of Canada (Atlantic), PO Box 1006, Dartmouth, NS, Canada B2Y 4A2 ...
Marine and Petroleum Geology, 1994
Marine and Petroleum Geology, 1996
ABSTRACT A data-based approach is used to establish detailed and accurate geochemical characteriz... more ABSTRACT A data-based approach is used to establish detailed and accurate geochemical characterization in oil source rock intervals, using well logs and noisy information from cuttings. The method starts by extracting examples from the intervals of interest, using generalized relationships between total organic content (TOC) and well log responses. The examples were used to train an artificial neural network (ANN) that extracted more detailed and accurate relationships between TOC and well-log responses specific to the study area. A combination of the ‘quickprop’ algorithm and ‘Dynamic Node Creation’ scheme was utilized to facilitate efficient training. The trained ANN is useful for mapping source rock intervals in the area of interest. This method performs satisfactorily when applied to the Egret source rock of the Jeanne d'Arc Basin, offshore eastern Canada.
Marine and Petroleum Geology, 1996