东营凹陷永 1 块沙四段砂砾岩体有效储层控制因素分析

东营凹陷永 1 块古近纪沙四段沉积时期砂砾岩体厚度大，内部多期叠置，非均质性极强，其有效储 层发育规律认识不清导致开发生产效果差。 基于岩心观察，结合大量岩石薄片、铸体薄片、压汞及物性等 分析化验资料，从宏观和微观 2 个方面系统分析了影响储层物性的主要地质因素。 永 1 块沙四段砂砾 岩体为陆上和水下兼具的扇三角洲沉积，储层物性明显受沉积条件和成岩作用双重控制，且二者间存在 联系。 沉积条件决定了不同沉积微相中的岩石相组合，而岩石相组合的成分又影响着储层物性的优劣。 扇三角洲前缘辫状水道中粒序层理含砾砂岩相和块状中粗砂岩相较发育，且物性较好，是有效储层发育 的优势相带；前扇三角洲中的细粉砂岩相较发育，但物性较差，不能作为有效储层的优势发育区。 优质储 层主要分布在永 1 块东北部的扇体中部辫状水道微相中，以含砾砂岩为主，孔隙度和渗透率均较高。

Controlling factors of effective reservoirs in glutenite body of the fourth member of Shahejie Formation in Yong 1 block,Dongying Sag

The glutenite body of the fourth member of Shahejie Formation in Yong 1 block of Dongying Sag is characterized by huge thickness, multi-period superposition and serious heterogeneity, and the development rule of effective reservoirs is unclear, which leads to poor development effect. Based on core observation, combined with rock thin sections, casting thin sections, mercury intrusion parameters and petrophysics, the main geological factors influencing its physical properties were systematically studied. The results indicate that this area is fan-delta deposition, with both onshore and underwater deposition. The physical properties of glutenite reservoir are mainly influenced by sedimentary condition and diagenesis, between which there is a relation. Sedimentary condition determines that different microfacies have different combination of lithofacies, and this difference also affects the reservoir properties. The braided channel in fan delta front is rich in pebbled sandstone facies and medium-coarse sandstone facies with better physical property, and it is favorable for in the deveolpment of effective reservoirs. On the other hand, the front fan delta has higher content of fine siltstone, with poor physical properties, so it can not serve as the development area of effective reservoirs.