Comparative Analysis of Tight Sandstone Reservoir Characteristics of He 8 Member in Central and Eastern Ordos Basin

The He 8 member of the Shihezi Formation in the Ordos Basin is a typical tight sandstone reservoir, but there are significant differences in gas well production among different gas fields. It is urgent to analyze and compare reservoir characteristics and summarize the influence of reservoir differences on gas well production. Provide theoretical and technical support for subsequent development. In this study, the tight sandstone of He 8 member in the central Sulige gas field, Sudongnan Gas Field, upper Paleozoic Jingbian gas field, southern Yulin gas field and Shenmu gas field were compared from the sedimentary environment, sand body size, petrological characteristics, reservoir physical properties, pore structure, etc. Based on the fracture pressure, microseismic monitoring and build-up testing, the reconstruction effect of He 8 reservoir was comprehensively evaluated. The results show that the scale of sand body of He 8 member is the central Sulige gas field > Sudongnan Gas Field > Shenmu Gas Field > upper Paleozoic Jingbian gas field > southern Yulin gas field, and the reservoir physical property is the central Sulige gas field > Sudongnan Gas Field > Shenmu Gas Field > southern Yulin gas field > upper Paleozoic of Jingbian gas field. The reservoir reconstruction effect is better in the Sudongnan Gas Field and the central Sulige gas field, medium in the southern Yulin and Shenmu gas field, and poor in the Upper Paleozoic of Jingbian gas field.