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Progress in Paleozoic coal-derived gas exploration in the Ordos Basin, West China

机译：中国西部鄂尔多斯盆地古生代煤成气勘探进展

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Based on practices of gas exploration and development in the Ordos Basin, this paper analyzes the controlling factors of large-scale accumulation conditions and distribution characteristics of coal-derived gas, and makes conclusions on the exploration progress of coal-derived gas based on present exploration situations. The approach has proven coal-derived gas reserves of 5.24×1012m3in the Ordos Basin. Twelve coal-derived gas fields have been found so far, mainly distributed in Upper Paleozoic Carboniferous-Permian clastic rocks and Lower Paleozoic Ordovician marine carbonate reservoirs. Tight sandstone gas reservoirs are developed in the Upper Paleozoic. The features of widely-distributed hydrocarbon-generation, interlayered with large-scale distribution of sandstones, where the reservoirs have become tight and followed by natural gas accumulation later, close range migration and efficient hydrocarbon accumulation, has resulted in a large area of distribution of tight sandstone gas zones. The Sulige large gas field has been found with proven coal-derived gas reserves of 3.49×1012m3, and two large-scale gas reserve replacement fields have been developed and implemented in the eastern part of the basin and in the Longdong area. Marine carbonate gas reservoirs are developed in the Lower Paleozoic. Gas generated from overlying source rocks have migrate downwards and accumulated in Ordovician weathering crust karst and dolomite reservoirs. The Jingbian gas field was discovered, with proven coal-derived gas reserves of 7000×108m3, meanwhile, several gas-rich regions have been found in the eastern side of the dolomite.
机译：根据鄂尔多斯盆地天然气勘探开发实践，分析了煤成气大规模成藏条件和成藏特征的控制因素，并在此基础上总结了煤成气勘探进展的结论。情况。该方法在鄂尔多斯盆地已探明5.24×1012m3的煤成气储量。迄今已发现十二个煤成气田，主要分布在上古生界石炭纪-二叠纪碎屑岩和下古生界奥陶纪海相碳酸盐岩储层中。上古生界发育了致密的砂岩气藏。油气成因分布广泛，夹有砂岩的大范围分布，储集层致密，随后天然气成藏，近距离运移和有效油气成藏，导致油气分布面积大。致密砂岩气带。苏里格大型气田已探明天然气储量为3.49×1012m3，并在盆地东部和the东地区开发并实施了两个大型气田替代气田。下古生界发育了海相碳酸盐岩气藏。上覆烃源岩产生的气体向下迁移并聚集在奥陶纪风化壳岩溶和白云岩储层中。发现了靖边气田，已探明的天然气衍生储量为7000×108m3，同时在白云岩的东侧发现了几个天然气富集区。

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