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| Evaluation method of comprehensive factor of fault sealing in volcanic rock area |
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GAO Changhai1,2, ZHA Ming1,2, JIANG Rufeng3
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(1.School of Geosciences in China University of Petroleum, Qingdao 266580, China;2.Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;3.Research Institute, Zhangjiang Branch of CNOOC, Zhanjiang 524057, China)
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| Abstract: |
| Based on geological conditions and fault sealing mechanisms in volcanic rock area, a fault sealing model of compaction diagenesis was established using the method of normal pressure on fault surface, and a fault sealing model of lithology juxtaposition was established based on density difference of fault surface and fault tightness index. An evaluation method of comprehensive factor of fault sealing in volcanic rock area was then carried out after taking normal pressure on fault surface, fault tightness index, density difference of fault surface and fluid index into consideration. The fault sealing in volcanic rock area of Karamay Oilfield is controlled by the fault level as a whole, namely, the better fault sealing leads to better comprehensive factor, and higher fault level, and eventually greater oil reservoir scale. The quantitative evaluation results compare well with the actual geological conditions, which suggests the wide applicability of the proposed method. |
| Key words: fault sealing sealing model comprehensive factor quantitative evaluation volcanic rock area |
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