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首页> 外文期刊>Journal of natural gas science and engineering >Structural controls on coalbed methane accumulation and high production models in the eastern margin of Ordos Basin, China
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Structural controls on coalbed methane accumulation and high production models in the eastern margin of Ordos Basin, China

机译：鄂尔多斯盆地东缘煤层气成藏构造控制及高产模式

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Significant progress has been made in coalbed methane (CBM) exploration and development in the eastern margin of the Ordos Basin where nearly 2000 CBM wells have been drilled, achieving a maximum gas production rate of 16000 m(3)/d by 2013. The geological evolution of the eastern Ordos Basin plays an important role in the CBM formation. This study is focused on the interrelationship between structural geology, gas accumulation and production characteristics of the No. 4 + 5 coal in the Permian Shanxi Formation as well as the No. 8 + 9 coal in the Carboniferous Taiyuan Formation. This research is based on the data collected from CBM production wells and coal samples from coalmines and exploration wells. The results show that thermogenic gas is the dominant CBM source in the study area and there are two significant generation periods, the coalification in the Triassic and the magmatic thermometamorphism during the Yanshan movement. Combining the structure background and hydrogeological conditions, the monoclinic-hydraulic sealing model was proposed as the representative CBM enrichment model. Different types of structures are also classified, and their influence on the CBM accumulation is discussed. Compressional structures formed during the Yanshan movement are conducive to CBM enrichment and retention; however, the tensional structures formed during the Himalaya movement may have led to CBM dissipation. Combining the structural effect on the CBM production with CBM exploration and development practices in the study area, the following three types of high gas production models are summarized: updip of the monocline, the axial part of the anticline or nose structure, and the structural high far from the normal fault. (C) 2015 Elsevier B.V. All rights reserved.
机译：鄂尔多斯盆地东缘煤层气勘探开发取得了重大进展，已钻探了近2000口煤层气井，到2013年天然气产量最高可达到16000 m（3）/ d。地质鄂尔多斯盆地东部的演化在煤层气的形成中起着重要作用。本研究的重点是二叠系山西组4 + 5号煤以及石炭系太原组8 + 9号煤的构造地质，天然气成藏与生产特征之间的相互关系。这项研究基于从煤层气生产井收集的数据以及煤矿和勘探井的煤样品。结果表明，成因气体是研究​​区主要的煤层气来源，有两个重要的生代时期，即三叠纪的煤化和燕山运动期间的岩浆热变质。结合构造背景和水文地质条件，提出了单斜油压封闭模型作为代表性的煤层气富集模型。还对不同类型的结构进行了分类，并讨论了它们对煤层气堆积的影响。燕山运动期间形成的压缩构造有利于煤层气的富集和保留。然而，在喜马拉雅运动期间形成的张拉结构可能导致煤层气散失。结合研究区域的煤层气生产结构效应与煤层气勘探开发实践，总结了以下三种类型的高产气模型：单斜线的上倾，背斜或鼻状构造的轴向部分以及构造高点。远离正常故障。 （C）2015 Elsevier B.V.保留所有权利。

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