储层特征及其主控因素分析 ——以鄂北十里加汗地区下二叠统山西组为例

Reservoir characteristics and main controlling factor analysis: taking Lower Permian Shanxi Formation in Shilijiahan area of North Ordos Basin as an example

赵明胜 田景春 张翔 苏炳睿2

沈阳师范大学古生物学院，辽宁 沈阳 110034 成都理工大学沉积地质研究院，四川 成都 610059

College of Paleontology, Shenyang Normal University, Shenyang 110034, China Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China

鄂尔多斯盆地十里加汗地区处于准连续成藏区，是上古界天然气有利的勘查地区。文中对十里加汗地区下二叠统山西组储集砂体的岩石学、孔隙结构及物性特征进行了研究。研究表明，山西组储集砂体物性较差，属于低孔、低渗储集层。孔隙类型多样，发育有残余粒间孔、次生粒间孔、粒内溶孔、铸膜孔、晶间孔、微裂缝等，具有储集意义的主要有残余粒间孔和次生粒间孔。另外，储层发育主要受到沉积作用及后期成岩演化作用的控制，沉积作用奠定了储层的物质基础，成岩演化改善了储集砂体物性。

The Shilijiahan area in Ordos Basin, located in a quasi-continuous reservoir-forming area, is a favorable exploration area for natural gas in the Upper Paleozoic. In this paper, the petrology, pore structure and physical properties of the reservoir sand bodies of Lower Permian Shanxi Formation in Shilijiahan area were studied. The results show that the reservoir sand bodies of Shanxi Formation has poor physical property, and belongs to low porosity and low-permeability reservoirs. There are many types of pores in the rock, including residual intergranular pores, secondary intergranular pores, intragranular dissolved pores, casting film pores, intercrystalline pores and microfractures. among them, the residual intergranular pores and secondary intergranular pores contribute greatly to the reservoir. In addition, reservoir development is mainly controlled by sedimentation and subsequent diagenetic evolution. Sedimentation laid the physical foundation, and subssequent diagenetic evolution effectively improved the physical properties of reservoir sand bodies.

10.6056/dkyqt202002004