A Preliminary Study on the Geological Conditions of the Permian Shale Oil(Gas) in Xirehada Area, Western Inner Mongolia
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摘要: 银额盆地是中国内陆地区油气地质工作程度极低的地区之一，前人以中生界为目的层的油气勘探进展缓慢，通过十余年的油气基础地质调查，发现石炭-二叠系具有较好的油气资源前景。笔者通过银额盆地希热哈达地区地质调查井和煤田钻井岩心采集的大量样品，开展了二叠系暗色泥岩分布、有机质丰度、类型、成熟度、矿物组成、储集特征和页岩油气显示等页岩油（气）地质条件的综合研究，认为希热哈达地区二叠系发育分布广、厚度大、有机质丰度高、Ⅱ1~Ⅱ2型优质烃源岩具有良好的生烃潜力；暗色泥岩中脆性矿物的含量较高，黏土矿物以伊利石为主，蒙皂石含量较高，有利于吸附气的聚集和后期压裂改造形成裂缝；暗色泥岩物性较好，裂缝、孔洞、残余原生孔隙、次生溶蚀孔和微裂缝等孔（缝）隙发育，具有良好的储集条件，且在钻井岩心中见到了二叠系良好页岩油气显示，指示了希热哈达地区二叠系具有良好的页岩油（气）资源前景，是银额盆地值得探索的新层系和新领域。Abstract: The Yingen-Ejin Banner basin is one of the inland areas in China with low degree of oil and gas geological investigation. A few of previous studies and progress in this area are focused on Mesozoic strata and took them as target stratum for oil-gas exploration. However, basic geological survey during the last decade shows that Permian-Carboniferous strata in this area are very potential for prospecting oil and gas resource. Various characteristics of Permian dark mudstone, such as distribution, abundance, type and maturity of organic matter, mineral composition, reservoir property, shale oil and gas indication, have been revealed by the comprehensive research works based on a large number of core samples from geological survey wells and coalfield drilling in Xirehada area, Yingen-Ejin Banner basin. The result shows that:Permian strata in Xirehada area has wide distribution, large thickness, high abundance of organic matter, high quality source rock of type Ⅱ1-Ⅱ2, which has good hydrocarbon generating potential. In these strata, the dark mudstone is rich in brittle minerals and is dominated by illite, with high montmorillonite content, suggesting that it is conducive to the accumulation of adsorbed gas and the formation of fractured fracture. Furthermore, well-developed pore structure in dark mudstone, such as fractures, holes, residual primary pores, secondary dissolution pores and micro fractures, provide good reservoir conditions and indicate good physical properties. Besides, good hydrocarbon shown in core samples further denote that Permian strata in Xieehada area has good prospects for shale oil and gas resources and is a new layer and new field worth to explore.
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Key words:
- Yingen-Ejin Banner basin /
- Uzhur sag /
- Xirehada area /
- Permian /
- shale oil(gas) /
- resource prospects
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