Infilling evolution and hydrocarbon accumulation of Jurassic in Turpan-Kumul Basin
Received date: 2024-09-22
Revised date: 2024-10-31
Online published: 2024-11-28
Supported by
The Science and Technology Projects of China National Petroleum Corporation(RIPED-2023-JS-2206)
In order to deepen the Jurassic hydrocarbon exploration of Turpan-Kumul Basin, based on lithology and lithofacies analysis, considering tectonic activity and paleoclimate change, according to the relative balance of rates of potential accommodation change with sediment + water supply, a process-based infilling model of Jurassic infilling was constructed. The results show that: (1) The Jurassic has undergone three types and five stages of sediment infilling, which are overfilled (Badaowan Formation), balanced-fill (Sangonghe Formation), overfilled (Xishanyao Formation), balanced-fill (Sanjianfang-Qiketai formations) and underfilled (Qigu–Kalazha formations); (2) The organic-rich sediments above flooding surfaces, especially around maximum flooding surfaces, in profundal strata, and within some intervals of lake-plain strata (source), highstand clastic shoreline strata, lowstand incised valley fills and lake floor fans (reservoir) and distal transgressive and highstand prodelta strata (seal) combined good source-reservoir-cap assemblage in overfilled stage. The organic-rich sediments above the flooding surfaces in para sequence scale and the lower portion of highstand systems tracts (source), lake-floor fans, incised-valley fills, and shoreline clastics deposited during transgressions and highstands (reservoir) and prodelta mudrocks in late transgressive and early highstand systems tracts (seal) combined favorable source-reservoir-cap assemblage during balanced-fill phase. The organic-rich sediments above the initial transgressive surface (source), transgressive sheetflood clastics, early highstand fluvial channels (reservoir) and upper transgressive and basal-highstand systems tract strata (seal) combined efficient source-reservoir-cap assemblage in underfilled phase. (3) The process-based infilling model of lacustrine basin can extend its relevant hypotheses or attributes into predictive realms, which is mainly reflected in the validity of facies description and the predictability of source rocks, reservoirs, sequence stacking patterns and hydrocarbon accumulation. It is predicted that a certain of source rock mainly composed of dark mudstone is developed in underfilled of Jurassic, and the incised-valleys, lake floor fans within the overfilled Badaowan and Xishanyao formations and the large-scale nearshore fans developed in balanced-fill Sanjianfang Formation are potential favorable exploration domains. The process-based analysis of lakes infilling is significant for theoretical study on evolution and hydrocarbon exploration and development of lacustrine basins.
Zhanlong YANG , Dongsheng XIAO , Chao WU , Jun HU , Bin HAO , Zaiguang LI , Qingpeng WU , Jingyi GUO , Zhenhua LIU . Infilling evolution and hydrocarbon accumulation of Jurassic in Turpan-Kumul Basin[J]. Natural Gas Geoscience, 2025 , 36(3) : 455 -468 . DOI: 10.11764/j.issn.1672-1926.2024.11.003
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