Characterization of fault architecture and fault seal analysisat cherokee ridge, greater green river basin, south-central wyoming
Başlık çevirisi mevcut değil.
- Tez No: 759490
- Danışmanlar: PROF. J. FOSTER SAWYER
- Tez Türü: Doktora
- Konular: Jeoloji Mühendisliği, Geological Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2019
- Dil: İngilizce
- Üniversite: South Dakota State Unıversıty
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
A fault seal analysis was performed for select faults within the Niobrara Formation at Cherokee Ridge, Greater Green Basin, south central Wyoming. Uncertainties regarding fault behavior in settings such as this present fundamental challenges in understanding fluid flow, compartmentalization, and other reservoir characteristics. The goal of this study was to determine whether the faults act as barriers or conduits to fluid migration and whether they have a profound effect on fluid flow and compartmentalization within the reservoir. To address this issue, a 3D pillar grid geologic model was created to perform a fault seal analysis utilizing 3D seismic and geophysical well log data. Another objective of this research was to test whether a fault seal analysis can be performed with sparse well data. The Niobrara Formation ranges in thickness from 1,200 to 1,560 ft (365 to 475 m) with a 5,500 ft (1,676 m) structural relief in the study area and consists mainly of interbedded organic rich shale (65%), carbonates (26%), and silt (marl) (9%) lithofacies. It overlies the Frontier Formation, and is capped by the Mancos Shale or the Steele Shale, depending on the sub-basin. Results of the modeling in this study indicate that clay volume (Vcl) values range from 15% to 62%, porosity values range from 4% to 23%, and permeability values range from 0.02 mD to 2.08 mD for the Niobrara Formation. Major faults within the study area tend to strike east-west. The faults are generally high angle in nature with dips ranging between 70° and 82°, with some dipping northward and others southward. Horizontal lengths for the faults that were selected for this study range from 0.86 to 5.8 mi (1.4 to 9.3 km). Cherokee Ridge 1 (CR1), CR2 and CR5 are dip slip faults with no visible lateral motion, whereas CR3 and CR4 indicate oblique sense of motions, right separation and left separation respectively. The fault seal analysis was successfully completed and a workflow was established as follows: First, major faults and tops and bases for the Mancos Shale, the Niobrara Formation, and the Frontier Formation were interpreted from seismic and well log data, second, facies and petrophysical properties were modeled, and third, 1D and 3D juxtaposition analyses were conducted. Finally, fault clay content, effective fault rock permeability, and transmissibility multipliers were predicted. Fault clay content was predicted as more than 20% for the major faults, which suggests the faults are sealing. Transmissibility multipliers (TM) calculations also indicate that the TM values for the major faults within the study area range from a minimum of 0 to a maximum of 0.92, which further indicates the major faults are prone to seal. An amplitude variation with offset (AVO) analysis shows anomalies that may be interpreted as the occurrence of possible compartmentalization within the Niobrara Formation. These findings may provide significant insights into future exploration and field development strategies. This research also provides clear evidence that a fault seal analysis can be performed successfully by interpreting 3D seismic and sparse well log data in an underexplored basin. The established workflow provided during this study includes the critical steps of structural interpretation, property modeling, and fault seal analysis that can be used as a road map for future scientific and industrial investigations.
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