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Attribute illumination of basement faults, examples from Cuu Long Basin basement, Vietnam and the Midcontinent, USA |
| ID |
42 |
| Title |
Attribute illumination of basement faults, examples from Cuu Long Basin basement, Vietnam and the Midcontinent, USA |
| Authors |
Ha T. Mai, Olubunmi O. Elebiju, and Kurt J. Marfurt |
| Authors detail |
Ha T. Mai, University of Oklahoma, Norman, USA
Olubunmi O. Elebiju, University of Oklahoma, Norman, USA
Kurt J. Marfurt, University of Oklahoma, Norman, USA |
| Publication |
FBR-Vietnam |
| Publication Detail |
Fractured Basement Reservoir Conference 2008 |
| Volume |
|
| Year |
2008 |
| Abstract |
Geometric attributes such as coherence and curvature have been very successful in delineating faults in sedimentary basins. While not a common exploration objective, fractured and faulted basement forms important reservoirs in Southern California, Mexico, India, Yemen, and Vietnam.
Basement faulting controls hydrothermally-altered dolomite in the Appalachian Basin of the USA, and is suspected to play a role in diagenetic alteration of carbonates in the Fort Worth Basin of north Texas where copper has been found in some wells, as well as in Osage County, OK, not far from the classic Mississippi type lead-zinc deposits. Because of the absence of stratified, coherent reflectors, illumination of basement faults is more problematic than illumination of faults within the sedimentary column. In order to address these limitations we make simple modifications to wellestablished vector attributes including structural dip and azimuth, amplitude gradients, and minimum and maximum curvature, to provide greater interpreter interaction. Using this workflow, we can better illuminate fracture 'sweet spots' and estimate their density and orientation. We apply this workflow to better characterize faults and build fracture models in the granite basement of the Cuu Long Basin, Vietnam, and the granite and rhyolite-metarhyolite basement of Osage County, Oklahoma, USA. Cuu Long forms an important unconventional reservoir. In Osage County, we suspect basement control of shallower fractures in the Mississippi chat deposits. |
| Keywords |
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| Status |
Accepted |
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