致密砂岩储层物性特征与质量差异控制因素研究——以A气田为例

Physical properties and quality difference controlling factors of tight sandstone reservoirs——by taking A gas field as an example

摘要: A气田储层为致密砂岩,物性控制因素复杂多样,三个目的层段岩性、沉积、储层和物性特征差异明显。利用岩心、薄片、物性、沉积相、测井等资料对储层的沉积作用、成岩作用与储层物性关系进行了深入研究,结果表明,研究区致密砂岩储层质量差异是沉积和成岩综合作用的结果,储层质量差异的主控因素为砂岩粒度、砂岩碎屑成分、胶结作用和溶解作用。岩屑石英砂岩是研究区优质的储层,石英砂岩次之。

Abstract: The reservoir of A gas field is a compact sandstone, and the controlling factors of physical properties are complex and diverse. The lithology, sedimentation, reservoir and physical properties of the three target intervals are obviously different. By using core, thin section, physical properties, sedimentary facies and logging data, the relationship between reservoir sedimentation, diagenesis and reservoir physical properties has been deeply studied. The results show that the quality difference of tight sandstone reservoirs in the study area is the result of the comprehensive effects of deposition and diagenesis, and the main controlling factors of the quality difference are sandstone grain size, sandstone clastic composition, cementation and dissolution.Lithic quartz sandstone is the high-quality reservoir in the study area, followed by quartz sandstone.