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Control of A ltyn T agh F ault on the J urassic shale gas in W estern Q aidam B asin, north‐west C hina
Author(s) -
Guo Tianxu,
Ren Shoumai,
Liu Yongjiang,
Wang Shengjian,
Zhou Zhi,
Chen Xianglin
Publication year - 2018
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.3337
Subject(s) - oil shale , geology , geochemistry , overpressure , outcrop , shale gas , source rock , tectonics , structural basin , sedimentary rock , fault (geology) , slip (aerodynamics) , maturity (psychological) , geomorphology , seismology , paleontology , psychology , developmental psychology , physics , thermodynamics
The shale of the Middle Jurassic Dameigou Formation in Western Qaidam Basin was developed with large thickness, high organic carbon content, and moderate thermal maturity, which means that it has the basic geological conditions for shale gas generation and accumulation are favourable. According to the comprehensive analysis, the Altyn Tagh Fault (ATF) did not uplift in the early–middle Jurassic period, and the Middle Jurassic stable lacustrine sedimentary strata were not affected by the strike‐slip fault, which provided abundant material basis for shale gas generation. Due to the effect of later ATF left‐lateral strike‐slip activity, and the North–South tectonic extrusion movement, the abnormal overpressure derived from Dameigou Formation was formed, which can provide good preservation conditions for shale gas. The interaction between ATF activity and shale deposition jointly controlled the formation and preservation of shale gas in Western Qaidam Basin.