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| Thermocompression simulation of hydrocarbon generation and expulsion for lacustrine stromatolite and hydrocarbon generation potential of microbial carbonates |
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SHE Min1,2, HU Anping1,2, WANG Xin1,2, FU Xiaodong1,2, WANG Yanqing1, XIA Zhiyuan1, CHEN Wei1,2
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(1.PetroChina Hangzhou Institute of Geology, Hangzhou 310023, China;2.Key Laboratory of Carbonate Reservoir, CNPC, Hangzhou 310023, China)
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| Abstract: |
| The simulation experiment of thermal evolution of stromatolite limestone from low to high maturity was conducted through the formation porosity thermocompression simulation experiment of hydrocarbon generation. The results show that the oil production rate of organic carbon in stromatolite limestone falls after increasing first with the raise of temperature. The oil generation peak is at 360 ℃ and the maximum oil production rate is 379.99 kg/t. The amount of oil expulsion rate is between 34％-68％. It is found that the CO2 has the largest yield, followed by H2, and hydrocarbon gas shows the smallest yield in the simulated gas product. The generation peak of hydrocarbon gas is at 380 ℃ and the maximum hydrocarbon gas production rate is 101.74 kg/t. The residual oil and discharge oil product both show the characteristics of more nonhydrocarbon and asphaltene, as well as fewer saturated hydrocarbon and aromatic hydrocarbon. The oil production rate of stromatolite limestone is less than that of argillaceous dolomite and gray mudstone but more than that of marlstone in the same amount of organic carbon. Especially, the stromatolite limestone has higher hydrocarbon gas production rate and lower TOC minimum as resource rocks. |
| Key words: microbial carbonates stromatolite hydrocarbon-generating simulation oil production rate gas production rate |
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