鄂尔多斯盆地东部上古生界煤系页岩气藏特征及勘探方向

Shale gas reservior characteristics of the Upper Paleozoic coal measures and exploration direction in eastern Ordos basin

煤系页岩气是未来非常规天然气的勘探方向。以鄂尔多斯盆地东部为例,对区内上古生界煤系太原组和山西组页岩气成藏的构造条件、储层特征和资源潜力进行了分析。研究认为,区内构造简单,泥页岩储层埋藏浅,厚度大,泥页岩有机质演化程度较高,有机碳含量较高,页岩气含量较高,页岩气成藏条件较优越,页岩气勘探开发的有利区位于府谷–神木–临县一带。鄂尔多斯盆地东部上古生界煤层发育,煤层气含量较高,局部层段存在砂岩气,页岩气可与煤层气、煤系砂岩气等综合勘查、共同开发。

Shale gas in coal measures is exploration direction of unconventional gas in the future.The tectonic conditionsand reservoir characteristics of shale gas of Taiyuan and Shanxi Formation of the Upper Paleozoic in theeastern Ordos basin are analyzed. Studies have shown that the structure in this area is simple, the burial depth of theshale resrvoir is shallow,the thickness is large, organic carbon content, evoluation degree of organic matter and gascontent of the shale are higher, shale gas accumulation conditions are favorable. The favorable area for shale gasexploration and development is located in the northeast of Ordos basin. In addition Upper Palaeozoic coal seamsare developed, CBM content is high, there exists sandstone gas in local interval. Shale gas, coal-bed methane andsandstone gas in coal measures can be integrally developed. In China, coal-bearing strata and shale are widely distributed,there are prospects for exploration and development of shale gas of coal measures.