The Experts below are selected from a list of 74634 Experts worldwide ranked by ideXlab platform
David H. Johnston - One of the best experts on this subject based on the ideXlab platform.
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Practical applications of Time-Lapse seismic data - Practical Applications of Time-Lapse Seismic Data
2013Co-Authors: David H. JohnstonAbstract:Time-Lapse (4D) seismic technology is a key enabler for improved hydrocarbon recovery and more cost-effective field operations. Practical Applications of Time-Lapse Seismic Data (SEG Distinguished Instructor Series No. 16) shows how 4D seismic data are used for reservoir surveillance, how they provide valuable insight on dynamic reservoir properties such as fluid saturation, pressure, and temperature, and how they add value to reservoir management. The material, based on the 2013 SEG Distinguished Instructor Short Course, includes discussions of reservoir-engineering concepts and rock physics critical to the understanding of 4D data, along with topics in 4D seismic acquisition and processing. A primary focus of the book is interpretation and data integration. Case-study examples are used to demonstrate key concepts and are drawn on to demonstrate the range of interpretation methods currently employed by industry and the diversity of geologic settings and production scenarios in which 4D is making a difference. Time-Lapse seismic interpretation is inherently integrative, drawing on geophysical, geologic, and reservoir-engineering data and concepts. As a result, this book should be of interest to individuals from all subsurface disciplines.
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practical applications of Time Lapse seismic data
2013Co-Authors: David H. JohnstonAbstract:Time-Lapse (4D) seismic technology is a key enabler for improved hydrocarbon recovery and more cost-effective field operations. Practical Applications of Time-Lapse Seismic Data (SEG Distinguished Instructor Series No. 16) shows how 4D seismic data are used for reservoir surveillance, how they provide valuable insight on dynamic reservoir properties such as fluid saturation, pressure, and temperature, and how they add value to reservoir management. The material, based on the 2013 SEG Distinguished Instructor Short Course, includes discussions of reservoir-engineering concepts and rock physics critical to the understanding of 4D data, along with topics in 4D seismic acquisition and processing. A primary focus of the book is interpretation and data integration. Case-study examples are used to demonstrate key concepts and are drawn on to demonstrate the range of interpretation methods currently employed by industry and the diversity of geologic settings and production scenarios in which 4D is making a difference. Time-Lapse seismic interpretation is inherently integrative, drawing on geophysical, geologic, and reservoir-engineering data and concepts. As a result, this book should be of interest to individuals from all subsurface disciplines.
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On the inversion of Time‐Lapse seismic data
SEG Technical Program Expanded Abstracts 2003, 2003Co-Authors: Sudipta Sarkar, Wences P. Gouveia, David H. JohnstonAbstract:As the number of Time-Lapse (4D) seismic applications increases; so do the prospects for quantitative estimates of dynamic reservoir properties, such as fluid saturation and pressure, based on Time-Lapse seismic data. These estimates can be obtained by the application of appropriate rock physics models that map seismic-derived estimates of TimeLapse Pand S-impedance changes to changes in the dynamic properties. Therefore, it is important that reliable 4D impedance models are available for this process. There are, however, a number of ways to estimate impedance change from 4D seismic data. The purpose of our study was to assess the merits of different inversion workflows by using a synthetic 4D data set and comparing models resulting from the inverse calculations with actual impedance models. This study demonstrates the importance of coupling the inversion of base and monitor surveys to mitigate the impact of inherent non-uniqueness in seismic data inversion. The results from uncoupled inversions can mislead Time-Lapse interpretation and compromise reservoir management decisions.
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Interpretation and modeling of legacy Time-Lapse seismic data
Journal of Petroleum Technology, 2000Co-Authors: David H. Johnston, J. Jane Shyeh, J. E. Eastwood, Mashiur Khan, Larry StanleyAbstract:Two 3D seismic data sets from the Lena field, U.S. Gulf of Mexico were analyzed for Time-Lapse effects. The Time-Lapse differences for the B80 reservoir are compared with production data, geologic models, flow simulations, and forward seismic models. A Time-Lapse-seismic-difference anomaly represents a region of gas invasion, and areas bypassed by the injected gas have been identified for infill drilling.
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Time-Lapse-seismic processing and analysis
Journal of Petroleum Technology, 1999Co-Authors: J. E. Eastwood, David H. Johnston, J. Jane Shyeh, Xuri Huang, K. Craft, R. Vauthrin, R. WorkmanAbstract:Seismic monitoring (Time-Lapse or 4D seismic) can increase recovery in existing and new fields significantly.
Robert G. Clapp - One of the best experts on this subject based on the ideXlab platform.
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Time‐Lapse seismic noise correlation tomography at Valhall
Geophysical Research Letters, 2014Co-Authors: S. A. L. De Ridder, Biondo Biondi, Robert G. ClappAbstract:We show that a reliable and statistically significant group velocity Time-Lapse difference between 2004 and 2010 can be retrieved from ambient seismic noise in an offshore hydrocarbon exploitation setting. We performed a direct comparison of Scholte wave group velocity images obtained using regularized tomography. We characterize the expected variation in group velocity images from the 2004 or 2010 recordings that result from fluctuations in the cross correlations by looking at cross correlations of portions of the recordings. We prove that the Time-Lapse difference is statistically significant. The Time-Lapse group velocity image from ambient noise data shows strong similarities with a Time-Lapse phase velocity map obtained from controlled source data. The most striking features are a northern and a southern group velocity increase due to compaction and subsidence as a result of reservoir production.
Gary F. Margrave - One of the best experts on this subject based on the ideXlab platform.
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Time-Lapse AVO inversion
2014Co-Authors: A. Nassir Saeed, Laurence R. Lines, Gary F. MargraveAbstract:We proposed new three Time-Lapse AVO inversion algorithms: 1) total inversion of the differences, 2) inversion of seismic difference only and 3) sequential reflectivity-constrained inversion. The proposed methods were implemented using synthetic data that simulate a Time-Lapse model of a heavy oil reservoir. Elastic physical parameters of the Time-Lapse model were chosen to represent reservoir conditions at pre-production and post-production periods after reservoir depletion.
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Practical Techniques for Time-Lapse AVO Inversion
SEG Technical Program Expanded Abstracts 2013, 2013Co-Authors: A. Nassir Saeed, Laurence R. Lines, Gary F. MargraveAbstract:Total inversion of the differences schemes are other Time-Lapse AVO inverse techniques that can be carried out into two different inverse objectives. These are: Inverting of Time-Lapse AVO seismic data for estimating of elastic physical model parameters of monitoring line and Time-Lapse reflectivity model parameters changes of base and monitoring lines. While a second total inversions of differences can be implemented to estimate elastic physical model parameters of base line along with Time-Lapse reflectivity model parameters changes of base and monitoring lines.
S. A. L. De Ridder - One of the best experts on this subject based on the ideXlab platform.
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Time‐Lapse seismic noise correlation tomography at Valhall
Geophysical Research Letters, 2014Co-Authors: S. A. L. De Ridder, Biondo Biondi, Robert G. ClappAbstract:We show that a reliable and statistically significant group velocity Time-Lapse difference between 2004 and 2010 can be retrieved from ambient seismic noise in an offshore hydrocarbon exploitation setting. We performed a direct comparison of Scholte wave group velocity images obtained using regularized tomography. We characterize the expected variation in group velocity images from the 2004 or 2010 recordings that result from fluctuations in the cross correlations by looking at cross correlations of portions of the recordings. We prove that the Time-Lapse difference is statistically significant. The Time-Lapse group velocity image from ambient noise data shows strong similarities with a Time-Lapse phase velocity map obtained from controlled source data. The most striking features are a northern and a southern group velocity increase due to compaction and subsidence as a result of reservoir production.
J. Capriotti - One of the best experts on this subject based on the ideXlab platform.
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Inversion of Time-Lapse Gravity Data for Reservoir Modeling
78th EAGE Conference and Exhibition 2016 - Workshops, 2016Co-Authors: J. Capriotti, R. KrahenbuhlAbstract:Compared to other geophysical methods for monitoring subsurface dynamic systems, Time-Lapse gravity has one important advantage in that the measurements are directly sensitive to the variations in density, which is solely related to the amount of mass changes per volume. In oil and gas reservoirs, such changes are primarily due to fluid movement and substitutions. Thus, while seismic method provides unparalleled structural resolution, Time-Lapse gravity method has the potential for characterizing the “content” that is the fluid saturation within “containers” delineated by seismic images. There have been significant advances in instrumentation, data acquisition, and quantitative interpretation in Time-Lapse gravity methods. As a result, we may be on the threshold of a new phase in the application of this method. This paper will focus on the quantitative interpretation techniques for Time-Lapse gravity data through different inversions and the associated applications in characterizing both the static and dynamic properties of the reservoirs. In particular, we will present and review inversion techniques for recovering Time-Lapse density distribution in reservoir and joint inversion methods of Time-Lapse gravity data with production data for imaging the permeability and saturation distribution in reservoirs.
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Inversion for permeability distribution from Time-Lapse gravity data
GEOPHYSICS, 2015Co-Authors: J. CapriottiAbstract:ABSTRACTUnderstanding reservoir properties plays a key role in managing a reservoir’s resources and optimizing production. History matching is an important means for characterizing those properties. We developed a method to invert for the distribution of permeability directly from Time-Lapse gravity data. In this process, we used fluid flow in a porous medium coupled with forward modeling of the Time-Lapse gravity response as the forward operator, and then we solved a nonlinear inversion to reconstruct the permeability distribution in the reservoir. We were able to formulate the deterministic inversion as a Tikhonov regularization problem because of the relatively low computational cost of forward modeling Time-Lapse gravity data. The inversion can combine the information from Time-Lapse gravity and injection-production data sets to determine a static state of the reservoir described by the permeability. The resulting model satisfied all data sets simultaneously while obeying the mechanics of fluid flow t...
