鄂尔多斯盆地苏里格气田东区致密储层分布模式

苏里格气田是我国典型的致密气储层发育区，对其储层沉积类型和成岩作用过程历来多有研究且存在争议。 利用岩心实验及分析资料，研究了苏里格气田东区致密储层地质特征，从沉积和成岩 2 个方面阐述了储层物性差异，并指出强压实、铁方解石交代和硅质胶结等作用是导致该区储层致密化的主要因素。 在分析沉积微相的基础上，明确了分流河道砂体是苏里格气田东区主要的优质储层，并建立了三角洲平原分流河道单砂体的 4 种垂向组合模式和 3 种侧向接触模式。

Distribution patterns of tight reservoirs in eastern Sulige Gas Field,Ordos Basin

Sulige Gas Field is a typical tight gas reservoir in China. There are some controversies in research conclusion of sedimentation types and diagenesis process. According to the core data, this paper studied the general geological characteristics of tight sand reservoir, illuminated the differences of reservoir properties from two aspects of sedimentation and diagenesis, and pointed out that strong compaction, ferroan calcite replacement and siliceous cementation are the main factors for reservoir densification. Based on the analysis of sedimentary microfacies, it is defined that distributary channel sand body is high quality reservoir in eastern Sulige Gas Field, and four kinds of vertical combination models and three kinds of lateral contact models of single sand body for the delta plain distributive channel were established.