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| Hydrocarbon entrapment and accumulation for Ordovician reservoirs from Xinken block of Halahatang depression as constrained from oil geochemistry |
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CHANG Xiang-chun1,2, WANG Tie-guan1, LI Qi-ming3, OU Guang-xi1, TAO Xiao-wan3
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(1.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum, Beijing 102249, China;2.College of Geological Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;3.Research Institute of Petroleum Exploration and Development,PetroChina, Beijing 100083, China)
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| Abstract: |
| Based on the oil geochemistry, petrography and microthermometry of fluid inclusions and basin modeling, the hydrocarbon entrapment and accumulation for Ordovician reservoirs from Xinken block of Halahatang depression was discussed. The results indicate that Ordovician oils are characterized by low C21/C23 tricyclic terpanes (<1), “V” shape of C27-C28-C29 sterane distribution and light stable carbon isotope (<-30‰), correlating well with the O3 source rock. The coexisting intact n-alkane series, evident UCM and fully developed 25-norhopanes in the same oil infer the mixture of a severely palaeo biodegraded oil and later fresh oil. Viscous oil, light oil and dry gas were entrapped in two generation of calcite cements with trimodal distribution of homogenization temperatures for aqueous inclusion correspondingly. The Ordovician reservoir has undergone three charges, which occurred in 402-412,9-11 and 6-8 Ma respectively. The third entrapment is mainly dry gas possibly originated from Cambrian source rock and constrains the targets near faults communicating the deep source beds. |
| Key words: geochemistry 25-norhopanes hydrocarbon inclusion basin modeling hydrocarbon charge |
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