Seismic amplitude has played a critical role in the exploration and exploitation of hydrocarbon in West Africa. Class 3 and 2 amplitude variation with offset (AVO) was extensively used as a direct hydrocarbon indicator and reservoir prediction tool in Neogene assets. As exploration advanced to deeper targets with class 1 AVO seismic character, the usage of seismic amplitude for reservoir presence and quality prediction became challenged. To overcome this obstacle, (1) we used seismic geomorphology to infer reservoir presence and precisely target geophysical analysis on reservoir prone intervals, (2) we applied rigorous prestack data preparation to ensure the accuracy and precision of AVO simultaneous inversion for reservoir quality prediction, and (3) we used lateral statistic method to sum up AVO behavior in regions of contrasts to infer reservoir quality changes. We have evaluated a case study in which the use of the above three techniques resulted in confident prediction of reservoir presence and quality. Our results reduced the uncertainty around the biggest risk element in reservoir among the source, charge, and trap mechanism in the prospecting area. This work ultimately made a significant contribution toward a confident resource booking.
When borehole geophysics technologies and applications come to mind, often we think of vertical seismic profiles (VSPs), checkshots, or wireline logging measurements. Problems that have been addressed include resolution enhancement, coverage, illumination, and time-to-depth conversion, among others. The papers in this special section, however, extend these relatively well-known techniques to include salt proximity work, use of high-pressure and ultrahigh-pressure geophones in VSPs, distributed acoustic sensing (DAS), acoustic wellbore ranging, refinement of velocity models and image enhancement, and impacts on business value. Although all the papers could have been about, for example, DAS or vertical resolution improvements, this special section turned out to be broader in terms of the application of borehole geophysics. What drives the need for borehole geophysics in these applications? Is it the significance of business value? Is it scientific and engineering knowledge? Is it some combination thereof? The answers to those questions are not addressed directly, but each paper is unique and offers useful results and techniques across many disciplines. This special section is not extensive in terms of the number of papers, but those included are well worth reading.
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