کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5483947 | 1522784 | 2017 | 62 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Examples of seismic diffraction imaging from the Austin Chalk and Eagle Ford Shale, Maverick Basin, South Texas
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی اقتصادی
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چکیده انگلیسی
In this study, we extract diffractions from 3D stack and then build a 3D diffraction volume that not only images faults but also contains amplitude information used to examine lithological composition in fault zones within the Austin Chalk and Eagle Ford Shale in South Texas. We then transform the diffraction data into amplitude envelope volume. This seismic attribute, together with clay volume (Vclay) data, is extracted along interpreted horizons and fault planes. Cross plots between seismic attributes and Vclay show that Vclay increases with increasing diffraction energy. In addition, we observe that the higher the diffraction energies, the higher the fluid saturation, suggesting higher impedance contrast at diffraction points. Furthermore, cross plots between instantaneous dominant frequencies extracted from the diffraction-image volume and amplitude envelope show that within the hydrocarbon-saturated zones, the dominant frequency is approximately constant and in the low-frequency range between 25 and 33Â Hz. However, outside the hydrocarbon zones, the dominant frequency increases as the amplitude envelope decreases. Maps of instantaneous dominant frequency extracted from the upper and lower Eagle Ford Shale reveal that areal distribution of low-dominant-frequency zones is coincident with high diffraction energy and hydrocarbon saturation. Based on the foregoing, we conclude that by analyzing diffraction data, it is possible to infer likely sediment variation and hydrocarbon sweet spots within the Eagle Ford Shale and other shale resource plays.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Petroleum Science and Engineering - Volume 157, August 2017, Pages 248-263
Journal: Journal of Petroleum Science and Engineering - Volume 157, August 2017, Pages 248-263
نویسندگان
Osareni C. Ogiesoba, Alexander Klokov,