鄂尔多斯盆地彬长矿区沉积体系及控气作用

Coal-bearing Depositional System and CBM Controlling Role in Binchang Mining Area of Ordos Basin

鄂尔多斯盆地彬长矿区地质构造条件较为简单,含煤沉积体系对煤层的富集起到主要作用。通过对彬长矿区侏罗系延安组的含煤沉积特征以及现有的典型煤层气井的产气情况进行分析。研究结果表明:延安组主要为陆相的湖泊沉积及河流三角洲沉积,煤层厚度以及顶底板所处的沉积相会影响煤层气的富集成藏,并对煤层气的开发起到重要的影响作用。

The geological tectonic conditions for coal bearing are relatively simple in Binchang Mining Area of Ordos Basin,and the depositional system is the main factor in coal enrichment.The paper analyzes the coal-bearing sedimentary features and production data of typical CBM wells.The study shows that main depositional environment in Yan＇an Group period are continental lake deposits and river delta deposits.The coal-seam thickness,sedimentary faces of coal seams and top bottom floor will affect the enrichment of CBM as well as the CBM exploration.