An integrated approach to identifying natural gas reservoir compartment using 3-D seismic depositional facies analysis and production tests: Examples from middle Frio fluvial reservoir, Stratton field, south Texas
- Bureau of Economic Geology, Austin, TX (United States)
To target incremental gas resources in a 50-year old gas field in the onshore Gulf, the authors used an integrated approach to identify natural gas reservoir compartments. From a 7.5 sq mi, 3-D seismic volume, the authors analyzed infield drilling and recompletions in the middle Frio Formation, Stratton field, south Texas. Data were also acquired from VSPs that were depth sampled for seismic thin-bed calibration, depositional facies analyses of well logs, production history, and static and transient pressure tests. Because the Frio reservoir section the authors imaged is not severely faulted, reservoir compartments indicated by well tests were thought to be caused by stratigraphic and diagenetic variability. A reflection amplitude slice map from the 3-D seismic survey illustrates structural variability and shows that depositional variability controls sandstone distribution. Color displays of 3-D seismic reflection amplitude data indicate subtle stratigraphic compartment boundaries when supported with geologic and engineering data. Calibrated 3-D slice maps showing channel meander-belt sandstones can detect reservoirs <250 ft wide and <15 ft thick, suggesting that reservoir geometry is consistent with compartment dimensions determined from pressure test data. These data sets illustrate the integrated approach required to successfully target incremental oil and gas resources by calibrated imaging of the interwell space.
- OSTI ID:
- 80287
- Report Number(s):
- CONF-941015-; TRN: IM9532%%415
- Resource Relation:
- Conference: 64. annual meeting of the Society of Exploration Geophysicists and international exposition, Los Angeles, CA (United States), 23-27 Oct 1994; Other Information: PBD: 1994; Related Information: Is Part Of SEG international exposition and sixty-fourth annual meeting -- 1994 Technical program: Expanded abstracts with authors` biographies; PB: 1736 p.
- Country of Publication:
- United States
- Language:
- English
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