Easton Wren - Academia.edu (original) (raw)
Papers by Easton Wren
Geophysical Prospecting, 1975
Geoscience Canada, 1984
This book is intended both as a text for students in advanced courses and also as a reference boo... more This book is intended both as a text for students in advanced courses and also as a reference book for persons engaged in seismic exploration. The theoretician and student need to appreciate what is practical, and practitioners need to understand theory and the possibilities it may ...
The current emphasis in seismic stratigraphy has This process of wavelet extraction, followed by ... more The current emphasis in seismic stratigraphy has This process of wavelet extraction, followed by the focussed on velocity inversion and the generation of derivation of the reflectivity sequence, allows the the pseudo-acoustic log from the seismic trace. ideal pre-conditioning for seismic velocity inverThere are several published methods on wavelet sion. extraction which invariably make assumptions about the wavelet, in terms of the phase spectrum, The significance of this approach is demonstrated as well as assumotions about the reflectivity. in a series of synthetic and real data examoles. The The SONISEIS method will provide the basic statistically computed wavelets allow for synthetic wavelet using a statistical estimation, indepenseismograms which consistently outmatch those dently of any assumptions about the wavelet. The with Ricker or best-estimate zero or minimumderived wavelet is re&ced in the seismic trace phase wavelets, with a spike of approphate amplitude and polarity. ...
While the oil industry was totally familiar with applied geophysics in the 1930’s, it was during ... more While the oil industry was totally familiar with applied geophysics in the 1930’s, it was during the 25-year span following World War II that geophysical technology and expertise underwent substantial development. Major innovations during this period included multifold acquisition, non-dynamite sources, competent marine acquisition, the transition from analog to digital recording and the corresponding emphasis on computer processing. However, geophysical objectives did not change during the same period. Primary targets remained structural traps (including reefs) and the collective development in acquisition and processing technology represented essentially an improvement in data quality. While interpretation techniques remained virtually static, the industry became intoxicated with aesthetic seismic sections and very little attention was paid to what the sections should look like. An elusive butterfly that taunted the industry was the idealistic possibility of using seismic data to ...
The current emphasis in seismic stratigraphy has This process of wavelet extraction, followed by ... more The current emphasis in seismic stratigraphy has This process of wavelet extraction, followed by the focussed on velocity inversion and the generation of derivation of the reflectivity sequence, allows the the pseudo-acoustic log from the seismic trace. ideal pre-conditioning for seismic velocity inver- There are several published methods on wavelet sion. extraction which invariably make assumptions about the wavelet, in
Geophysical Prospecting, 1975
With few exceptions, traditional approaches to contouring have been too subjective. Contouring an... more With few exceptions, traditional approaches to contouring have been too subjective. Contouring and contour maps are too often discussed in terms more appropriate to art than to science. With hand contouring there is some justification for this attitude; with machine (i.e. programmed) contouring there is none.Hand contouring is highly susceptible to interpretive judgement and the interpreter is not bound by rigid mathematical constraints. Hence, in allowing for the interpreter's “freedom of expression” it may be difficult to evaluate hand contouring in a totally analytical and objective manner. Machine contouring, however, is based upon mathematical formulation. It is therefore a consistent and objective procedure, ideally suited to objective definition and analysis.It can be demonstrated that the combined process of sampling plus contouring constitutes a two-dimensional filter. The contouring component is that part which introduces “distortion” or wavenumber discrimination. An ideal contour package is one that acts as an all-pass filter where the distortion is zero.The application of filter theory to the evaluation of a machine contour package and its performance permits description in the more convenient language and terminology of the wavenumber domain, rather than that of the space domain. A more important advantage is that the contour package can be subjected to the various standards of filter evaluation such as amplitude and phase response.The practical application, as well as the benefit, of this approach is revealed through the comparison, in both the space and wavenumber domains, of contour maps generated from various machine contour packages.
Geophysical Prospecting, 1975
Transactions of The Royal Society of Tropical Medicine and Hygiene, 2008
Infection and Immunity, 2007
Journal of Management History, 2009
Purpose – This paper aims to discuss the work of Frank and Lillian Gilbreth and how it is still a... more Purpose – This paper aims to discuss the work of Frank and Lillian Gilbreth and how it is still a fundamental part of business in the twenty-first century. It is also proposed that the system developed by the Gilbreths could be added as a supplement, or even considered as a replacement to certain modern process management systems. Design/methodology/approach – A qualitative methodology is used and the Gilbreths' system as described in their original works are compared and contrasted with modern process management systems appearing in contemporary literature. Findings – It is found that most modern process management systems are based on the work of the Gilbreths and other seminal thinkers. However, it is suggested that by paying more attention to the human element, the Gilbreths might have developed a more comprehensive system in comparison with current ones. Originality/value – This paper attempts to reemphasize the role and importance of Frank and Lillian's work as foundational to modern process management systems and to suggest that more attention needs to be given to the human interface in such systems.
Atmospheric Environment (1967), 1978
Geophysical Prospecting, 1975
Geoscience Canada, 1984
This book is intended both as a text for students in advanced courses and also as a reference boo... more This book is intended both as a text for students in advanced courses and also as a reference book for persons engaged in seismic exploration. The theoretician and student need to appreciate what is practical, and practitioners need to understand theory and the possibilities it may ...
The current emphasis in seismic stratigraphy has This process of wavelet extraction, followed by ... more The current emphasis in seismic stratigraphy has This process of wavelet extraction, followed by the focussed on velocity inversion and the generation of derivation of the reflectivity sequence, allows the the pseudo-acoustic log from the seismic trace. ideal pre-conditioning for seismic velocity inverThere are several published methods on wavelet sion. extraction which invariably make assumptions about the wavelet, in terms of the phase spectrum, The significance of this approach is demonstrated as well as assumotions about the reflectivity. in a series of synthetic and real data examoles. The The SONISEIS method will provide the basic statistically computed wavelets allow for synthetic wavelet using a statistical estimation, indepenseismograms which consistently outmatch those dently of any assumptions about the wavelet. The with Ricker or best-estimate zero or minimumderived wavelet is re&ced in the seismic trace phase wavelets, with a spike of approphate amplitude and polarity. ...
While the oil industry was totally familiar with applied geophysics in the 1930’s, it was during ... more While the oil industry was totally familiar with applied geophysics in the 1930’s, it was during the 25-year span following World War II that geophysical technology and expertise underwent substantial development. Major innovations during this period included multifold acquisition, non-dynamite sources, competent marine acquisition, the transition from analog to digital recording and the corresponding emphasis on computer processing. However, geophysical objectives did not change during the same period. Primary targets remained structural traps (including reefs) and the collective development in acquisition and processing technology represented essentially an improvement in data quality. While interpretation techniques remained virtually static, the industry became intoxicated with aesthetic seismic sections and very little attention was paid to what the sections should look like. An elusive butterfly that taunted the industry was the idealistic possibility of using seismic data to ...
The current emphasis in seismic stratigraphy has This process of wavelet extraction, followed by ... more The current emphasis in seismic stratigraphy has This process of wavelet extraction, followed by the focussed on velocity inversion and the generation of derivation of the reflectivity sequence, allows the the pseudo-acoustic log from the seismic trace. ideal pre-conditioning for seismic velocity inver- There are several published methods on wavelet sion. extraction which invariably make assumptions about the wavelet, in
Geophysical Prospecting, 1975
With few exceptions, traditional approaches to contouring have been too subjective. Contouring an... more With few exceptions, traditional approaches to contouring have been too subjective. Contouring and contour maps are too often discussed in terms more appropriate to art than to science. With hand contouring there is some justification for this attitude; with machine (i.e. programmed) contouring there is none.Hand contouring is highly susceptible to interpretive judgement and the interpreter is not bound by rigid mathematical constraints. Hence, in allowing for the interpreter's “freedom of expression” it may be difficult to evaluate hand contouring in a totally analytical and objective manner. Machine contouring, however, is based upon mathematical formulation. It is therefore a consistent and objective procedure, ideally suited to objective definition and analysis.It can be demonstrated that the combined process of sampling plus contouring constitutes a two-dimensional filter. The contouring component is that part which introduces “distortion” or wavenumber discrimination. An ideal contour package is one that acts as an all-pass filter where the distortion is zero.The application of filter theory to the evaluation of a machine contour package and its performance permits description in the more convenient language and terminology of the wavenumber domain, rather than that of the space domain. A more important advantage is that the contour package can be subjected to the various standards of filter evaluation such as amplitude and phase response.The practical application, as well as the benefit, of this approach is revealed through the comparison, in both the space and wavenumber domains, of contour maps generated from various machine contour packages.
Geophysical Prospecting, 1975
Transactions of The Royal Society of Tropical Medicine and Hygiene, 2008
Infection and Immunity, 2007
Journal of Management History, 2009
Purpose – This paper aims to discuss the work of Frank and Lillian Gilbreth and how it is still a... more Purpose – This paper aims to discuss the work of Frank and Lillian Gilbreth and how it is still a fundamental part of business in the twenty-first century. It is also proposed that the system developed by the Gilbreths could be added as a supplement, or even considered as a replacement to certain modern process management systems. Design/methodology/approach – A qualitative methodology is used and the Gilbreths' system as described in their original works are compared and contrasted with modern process management systems appearing in contemporary literature. Findings – It is found that most modern process management systems are based on the work of the Gilbreths and other seminal thinkers. However, it is suggested that by paying more attention to the human element, the Gilbreths might have developed a more comprehensive system in comparison with current ones. Originality/value – This paper attempts to reemphasize the role and importance of Frank and Lillian's work as foundational to modern process management systems and to suggest that more attention needs to be given to the human interface in such systems.
Atmospheric Environment (1967), 1978