论文部分内容阅读
鄂尔多斯盆地上古生界致密砂岩气资源丰富,搞清鄂尔多斯盆地上古生界储层致密砂岩储层微观孔喉特征对勘探开发有着重要指导意义。选取了盒8段和山1段致密砂岩储层岩心样品进行恒速压汞测试,计算出喉道半径和孔隙半径,进而分析储层微观孔喉体系特征。研究表明:西峰地区盒8段和山1段致密砂岩储层喉道半径分布0.1~4.0μm之间,主峰介于0.5~1.2之间;同时孔隙半径分布于80~360μm之间,而峰值介于100~160μm之间;主要含气层段砂岩储层整体较为致密,孔隙与喉道半径分布差异较大,孔喉的巨大差异造成储层显示低渗透-超低渗透的复杂致密结果。
The tight sandstone gas in the Upper Paleozoic of the Ordos Basin is rich in resources. It is of great guiding significance for exploration and development to clarify the micro-pore-throat characteristics of the tight sandstone reservoirs in the Upper Paleozoic in the Ordos Basin. The samples of tight sandstone reservoirs in Block 8 and Block 1 were selected for constant-pressure mercury intrusion test to calculate the throat radius and pore radius, and then to analyze the characteristics of micro-pore throat system. The results show that the distribution of throat radius of tight sandstone reservoirs in Box 8 and Shan 1 of Xifeng area is between 0.1 and 4.0 μm, the main peak is between 0.5 and 1.2 and the pore radius is between 80 and 360 μm, Between 100 and 160 μm. The sandstone reservoirs in the main gas-bearing intervals are generally dense with large differences in the radius distribution of pores and throats. The huge differences in pore throats cause the reservoir to show complex and dense results with low-permeability and ultra-low permeability.