| Citation: | JIANG Jun，PING Hongwei，WU Shaojun，et al. Identification of oil sources from marine-continental faces source rooks and quantitative evaluation of mixed-source oil contributions in the southern slope of Kuqa Depression, Tarim Basin: A case study of the Yaha structure zone[J]. Bulletin of Geological Science and Technology，2025，44（4）：201-216 doi: 10.19509/j.cnki.dzkq.tb20240749
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The Yaha area on the southern slope of the Kuqa sub-basin is a significant hydrocarbon-rich region in the Tarim Basin; however, the origin of its crude oil remains unclear.
This study analyzed 13 crude oil samples from the Yaha area using organic geochemical techniques and employed an end-member oil mixing model to quantify the contributions of marine and terrestrial sources in the mixed oils.
Biomarker characteristics indicate that the crude oils in the Yaha area can be broadly classified into three types: Terrestrial oils, marine oils, and mixed oils. Terrestrial oils primarily derive from lacustrine source rocks, with pristane/phytane (Pr/Ph) values ranging from 1.20 to 2.35 (averaging 1.74). The tricyclic terpanes (TT) are dominated by C20TT and C21TT, with a high abundance of rearranged compounds such as C30 early-eluting rearranged hopanes (compound X). The n-alkane carbon isotope values range from −28‰ to 32‰. Marine oils are a mixture of multi-stage marine source rock contributions, exhibiting Pr/Ph values between 0.74 and 0.92 (average of 0.81), with peak C23TT and C24TT compounds and a high abundance of long-chain tricyclic terpanes. Their n-alkane carbon isotope values are generally lighter than −32‰. Additionally, the presence of 25-norhopane compounds in the marine oils indicates significant early-stage biodegradation.. Mixed oils display biomarker and isotopic features characteristic of both marine and terrestrial oils. Except for the lower absolute maturity values observed in wells Yaha5, Yaha 401, and Yaha 3 (Well Yaha 3: 0.57%
These findings demonstrate that the continental oil prospects on the southern slope of the Kuqa sub-basin remain promising for discovering marine oil and gas resources. This has significant implications for expanding future oil and gas exploration in the southern slope of the Kuqa Depression.
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