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Developing a model discrete fracture network, drilling, and enhanced oil recovery strategy in an unconventional naturally fractured reservoir using integrated field, image log, and three-dimensional seismic data

Thomas H. Wilson, Valerie Smith and Alan Brown
Developing a model discrete fracture network, drilling, and enhanced oil recovery strategy in an unconventional naturally fractured reservoir using integrated field, image log, and three-dimensional seismic data
AAPG Bulletin (April 2015) 99 (4): 735-762

Abstract

In this study, we develop a model discrete fracture network (DFN) for the unconventional, naturally fractured Tensleep Sandstone oil reservoir at Teapot Dome, Wyoming. Reservoir characterization is based on three-dimensional (3D) seismic data, fracture image logs from Teapot Dome, and field observations of the Tensleep exposure in the Alcova anticline and Fremont Canyon areas. Image logs reveal that the dominant reservoir fracture set trends parallel to the present-day maximum horizontal compressive stress (S (sub Hmax) ) inferred from drilling induced fractures. Analog field studies of the Alcova anticline and Fremont Canyon suggest fracture heights and lengths are power-law distributed, while the fracture spacing distribution is best described as log-normal. Image-log-derived fracture apertures are also log-normally distributed. These properties are incorporated into a model DFN. We assume subseismic folds, faults, and fracture zones control fracture intensity distribution and use composite 3D seismic attributes to locate subtle changes in seismic response interpreted to result from subseismic structure. Directional curvature defines aperture-opening strain normal to the dominant reservoir fracture set. Seismic attributes are scaled and combined to control fracture intensity variations in the model. Grid-cell porosity and permeability distributions derived from the DFN suggest the presence of northeast-southwest-trending reservoir compartments. We suggest that enhanced oil recovery operations may be optimized using lateral CO (sub 2) injection and production wells oriented along interpreted compartment boundaries at high angles to S (sub Hmax) . This combination of CO (sub 2) injection and production laterals could help maximize CO (sub 2) storage and hydrocarbon recovery in depleted reservoirs and in down-dip residual oil zones.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 99
Serial Issue: 4
Title: Developing a model discrete fracture network, drilling, and enhanced oil recovery strategy in an unconventional naturally fractured reservoir using integrated field, image log, and three-dimensional seismic data
Affiliation: West Virginia University, Morgantown, WV, United States
Pages: 735-762
Published: 201504
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 54
Accession Number: 2015-054502
Categories: Economic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., strat. col., 2 tables, sketch maps
N41°00'00" - N45°00'00", W111°00'00" - W104°00'00"
Secondary Affiliation: Schlumberger Carbon Services, USA, United StatesSchlumberger NExT, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States
Update Code: 201525
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