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OALib Journal期刊
ISSN: 2333-9721
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鄂尔多斯盆地东缘煤层气成藏地质模型
Keywords: 煤层气,成藏地质模型,有利区,上古生界,鄂尔多斯盆地东缘
Abstract:
？鄂尔多斯盆地东缘煤层气勘探开发有20余年历史，近年来在保德、柳林等区块规模化开发迅速发展，但总体上全区产业化发展并不均衡。除工程因素外，对煤层气地质条件的认识仍然存在分歧，煤层气成藏地质模型可以为勘探选区提供借鉴。通过对鄂尔多斯盆地东缘构造格架、地层层序、水动力条件及气体成因的研究，构建了研究区北段单斜式低煤级煤层气成藏地质模型、中段基底上拱式中煤级煤层气成藏地质模型、南段边缘推覆式高煤级煤层气成藏地质模型，典型代表区域分别在府谷、吴堡—柳林和韩城。其中，单斜式低煤级煤层气成藏地质模型中，煤层气相对富集于地下水滞留区上部|在基底上拱式中煤级煤层气成藏地质模型中，煤层气高渗富集区位于拉张型鼻状隆起带|在边缘推覆式高煤级煤层气成藏地质模型中，气体富集于挤压型构造转折端。研究结果表明:吴堡—柳林基底上拱式中煤级煤层气成藏地质模型各成藏要素匹配良好，气体储集和渗流条件最好，建议作为优先开发区域|府谷单斜式低煤级的含气性相对差，渗透率高|韩城地区尽管气体保存条件好，但边浅部受边缘逆冲推覆构造的影响，煤体结构破坏严重，煤层气可采性差。
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