| Citation: | LUO Mingxia, CAO Zicheng, XU Qinqi, LIU Yongli, SHANG Kai. Geochemical characteristics and geological significance of Sinian crude oil from Well Tashen 5, Tahe Oilfield, Tarim Basin[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 135-149. doi: 10.19509/j.cnki.dzkq.tb20230194
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The Well Tashen 5 that was completed in 2021 has a burial depth of 9 017 m and is currently the deepest drilling well in Asia. It is also the first hydrocarbon breakthrough in the dolomite sectionof Upper Sinian at a depth of 8 780-8 840 m in the Tarim Basin. This is a major discovery in the field of ultradeep dolomite after the breakthrough of the Cambrian subsalt from the Well Luntan 1.
To better understand the hydrocarbon generation process, the organic geochemical characteristics of the Sinian condensate and the Upper Ordovician heavy oil in the Well Tashen 5 and its neighboring Cambrian volatile oil and Ordovician condensate were compared.
The n-alkane series of both the condensate and the chloroform extracted from dolomite are well distributed in the Sinian of the Well Tashen 5, indicating the domination of anoxic environment during the deposition of organic matter. Both biomarker compounds and carbon isotope distributions in the Sinian hydrocarbons of the Well Tashen 5 are similar to those of the Ordovician normal oils-ultraheavy oils and condensate oils of the Yakla region, implying the same hydrocarbon source between the Well Tashen 5 and the Yakla region. Equivalent vitrinite reflectance (
The breakthrough of Sinian hydrocarbons in the Well Tashen 5 has discovered a new hydrocarbon-bearing layer, displayed the process of ultradeep hydrocarbon formation, and indicated a new exploration direction for ultradeep exploration in the Tarim Basin.
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