Quantitative characterization of fracture spatial arrangement and intensity in a reservoir anticline using horizontal wellbore image logs and an outcrop analogue

Wang, Qiqi; Narr, Wayne; Laubach, Stephen E.

doi:10.1016/j.marpetgeo.2023.106238

Title: Quantitative characterization of fracture spatial arrangement and intensity in a reservoir anticline using horizontal wellbore image logs and an outcrop analogue

Journal Article · Thu Jun 01 00:00:00 EDT 2023 · Marine and Petroleum Geology

DOI:https://doi.org/10.1016/j.marpetgeo.2023.106238· OSTI ID:1963516

; Narr, Wayne; Laubach, Stephen E.

Using image logs from horizontal wells in the asymmetric East Painter Reservoir anticline in Wyoming, scanlines and petrographic observations from nearby outcrops, and methods that allow statistical quantification of fracture spatial arrangement patterns (including clustering), we show that in early Jurassic Nugget Formation sandstone degree of clustering and intensity of fractures varies with structural position. In the backlimb, fractures are markedly more clustered than random, and hierarchical and regularly spaced clusters are present, but intensity is low. In the forelimb, arrangements are mostly indistinguishable from random, but intensity is high. Based on image log response, the backlimb contains a higher proportion of open fractures, although the forelimb has greater numbers of open fractures. Spatial arrangement and intensity patterns are similar in a forelimb outcrop. Petrography reveals that quartz seals fractures less than 0.15 mm wide. Wider fractures are open with quartz rinds or are quartz lined and sealed with calcite or filled by quartzose cataclasite. The proportion of open fractures depends on quartz and calcite deposits and closure by reactivation (shearing) of pre-existing quartz lined fractures. Based on increased abundance and greater strike dispersion, results suggest that in forelimbs, high fracture intensities reflect shear on preexisting fractures, possibly resulting in more numerous but less spatially correlated open fractures. The most prolific gas and water production wells are in the backlimb, suggesting that clustered but sparse quartz-lined open fractures are more effective fluid conduits than closely spaced partly damaged/sheared arrays.

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Research Organization:: Univ. of Texas, Austin, TX (United States). Jackson School of Geosciences

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: SC0022968

OSTI ID:: 1963516

Alternate ID(s):: OSTI ID: 1992520

Journal Information:: Marine and Petroleum Geology, Journal Name: Marine and Petroleum Geology Vol. 152 Journal Issue: C; ISSN 0264-8172

Publisher:: ElsevierCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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15 GEOTHERMAL ENERGY
02 PETROLEUM
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fracture
fault
spatial arrangement
cluster
corridor
quartz
sandstone
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Title: Quantitative characterization of fracture spatial arrangement and intensity in a reservoir anticline using horizontal wellbore image logs and an outcrop analogue

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