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鄂尔多斯盆地苏里格气田是我国最大的气田,但是储层岩性较为致密,已成为制约天然气勘探开发的主要因素,因此,开展储层孔隙结构特征研究对于该区天然气生产具有重要意义。通过扫描电镜、薄片鉴定、压汞、铸体薄片等分析测试方法对苏里格气田苏54区块储层微观孔隙结构进行了深入分析。结果表明:该区储层由北到南主要发育岩屑砂岩、岩屑质石英砂岩和石英砂岩;喉道半径普遍较小,孔喉分选较差,且以细孔径为主,孔喉连通性中等;孔渗普遍偏低,属低孔低渗,孔渗明显受沉积相带的控制,高孔渗区呈贯穿南北的条带状分布,与河道展布特征近似。研究表明物性高值区连片分布,东部好于西部,盒8下物性最好。
The Sulige gas field in Ordos Basin is the largest gas field in China. However, the reservoir lithology is relatively tight and has become a major factor restricting natural gas exploration and development. Therefore, studying on the pore structure of reservoirs is of great significance to the natural gas production in this area. The microscopic pore structure of Su 54 block reservoir in Sulige gas field was analyzed by scanning electron microscopy (SEM), flake identification, mercury intrusion and casting thin slice analysis. The results show that the reservoirs in this area are mainly composed of lithic sandstone, lithic quartzite sandstone and quartz sandstone from north to south. The throat radius is generally small, the pore throat is poorly sorted, and the pore diameter is dominant. The pore permeability is generally low, which is low porosity and low permeability. The pore permeability is obviously controlled by sedimentary facies. The high porosity permeability zone has a distribution along the north and south of the strip, which is similar to that of the river channel. The results show that the high value areas are contiguous, the east is better than the west, and the best under the box 8.