Methods and Case Studies of Ultra‐deep Fault Seal Evaluation

Fault seals are significant for petroleum exploration and production. This study summarizes the fault sealing impacting factors, including lithological juxtaposition, mud smearing, fault rocks and the fault plane stress states, as well as evaluation methods like Allan maps and Shale Gouge Ratio (SGR...

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Published inActa geologica Sinica (Beijing) Vol. 96; no. 4; pp. 1402 - 1414
Main Authors CHEN, Shuping, YU, Yixin, CHEN, Shi, WANG, Xinpeng, FENG, Guimin, YUAN, Haowei, GOU, Qiwei, XU, Shidong, ZHAO, Huaibo, KONG, Linghua
Format Journal Article
LanguageEnglish
Published Richmond Wiley Subscription Services, Inc 01.08.2022
State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China
College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China%PetroChina Xinjiang Oilfield Company,Kelamayi,Xinjiang 834000,China
EditionEnglish ed.
Subjects
Compression
Evaluation
fault sealing
Jinma–Yazihe structure
Jurassic
Lithology
Mechanical properties
Methods
Mud
Oil and gas exploration
Oil and gas fields
Oil exploration
Oil fields
Petroleum
Plane stress
Reservoirs
Rocks
Sealing
Sedimentary rocks
Shale
Shunbei 5 strike‐slip fault
Triassic
ultra‐deep layer
fault sealing
ultra-deep layer
Jinma-Yazihe structure
Shunbei 5 strike-slip fault
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Summary:Fault seals are significant for petroleum exploration and production. This study summarizes the fault sealing impacting factors, including lithological juxtaposition, mud smearing, fault rocks and the fault plane stress states, as well as evaluation methods like Allan maps and Shale Gouge Ratio (SGR). The seal evaluation for a wrench fault focuses on its particular structural features. The evaluation methods were applied to the Jinma–Yazihe structure and the Shunbei oilfield. The source rock is the Xujiahe Formation of the Upper Triassic, the reservoirs and caprocks being of the Shaximiao Formation of the Lower Jurassic. The fault sealing evaluations in major faults proved the reservoir formation processes in the wells Jinfo 1 (JF1) and Chuanya 609 (CY–609), based on the editions of the Allan map showing lithological juxtaposition, the calculation of SGR showing mud smear and analyses of fault stress states. The analyses of stress states were also applied to Shunbei 5 strike‐slip fault in the Shunbei area in Tarim Basin. The various sections along the fault were of different mechanical properties, such as compression and extension. Petroleum exploration has demonstrated that the extensional sections are more favorable for oil accumulation than the compressional sections. These evolutionary methods and other understandings will help in analyses of deep fault sealing.
Bibliography:About the first and corresponding author
CHEN Shuping, male, born in April 1965, obtained his bachelor's degree of Engineering in Mineral Surveying and Exploration in the Eastern China Petroleum Institute (China University of Petroleum, Beijing) in 1985, his master's degree in Structural Geology in the China University of Geosciences, Beijing, in 1988 and his Doctor's degree of philosophy in Geological Resources and Geological Engineering at the Petroleum University, Beijing (China University of Petroleum, Beijing) in 2002. He was a teacher at the Eastern China Petroleum Institute from 1988 to 2002, a postdoctoral researcher in 2002–2004 at the Institute of Geology, China Seismological Bureau, as well as a visiting scholar at the University of Texas at Austin in 2013–2014. He is now a professor in geology at the China University of Petroleum, Beijing, engaged in research and teaching in structural geology and the tectonic analysis of basins.
ISSN:1000-9515
1755-6724
DOI:10.1111/1755-6724.14971