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| Identification signs of multiphase karstification of Ordovician reservoir in Tahe Oilfield |
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WAN Yun1,LIU Cun-ge2,LIU Hong1,LIU Jian-jun2,YUAN Fu-feng3
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(1.Scientific Research Department, Chongqing University of Science and Technology, Chongqing 401331，Chirm;2. Northwest Branch Company，SIN OPEC, Urumchi 830011, China;3.Graduate School of Southwest Petroleum University, Chengdu 610500, China )
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| Abstract: |
| The identification signs of karstification in syndiagenetic stage, Caledonian Epidiagenetic stage, Early Ercynian Epidiagenetic stage and Epi-Hercynian burial stage were studied in detail by the means of core observation，thin section analysis, paleontology and geochemistry on the basis of the information of regional geology, well drilling and well logging. The results show that the characteristics of the periodic karstifications are significantly different in the regional distribution, and the petrology，diagenesis，geochemistry and paleontology features of the kastic products are different. Therefore the identification marks of the periodic karstifications can be established to guide petroleum exploration. |
| Key words: Tahe Oilfield Ordovician formation karstification identification sign Caledonian Early Hercynian Syndiagenetic stage burial stage |
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