扇三角洲沉积微相与有利储层的关系——以青东凹陷青东5块沙四上沉积为例  

Relationship of fan-deltaic microfacies and favorable reservoir:A case study on sedimentary microfacies of the upper submember of Es4 in Qingdong-5 block

作　　者：李守军 徐磊 张祥玉 闫明明 耿耿 刘宝梅 魏宁 LI Shoujun;XU Lei;ZHANG Xiangyu;YAN Mingming;GENG Geng;LIU Baomei;WEI Ning(College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)

机构地区：[1]山东科技大学地球科学与工程学院,山东青岛266590

出　　处：《山东科技大学学报（自然科学版）》2019年第3期14-24,34,共12页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(41602135)

摘　　要：为研究不同沉积特征对储层发育的影响,利用测井、录井、分析化验资料以及岩心观察,通过点、线、面沉积相综合分析对比,确定研究区内存在三种沉积亚相扇三角洲前缘、扇三角洲平原、前三角洲。通过对比岩性、电性及沉积特征,进一步识别划分出九种沉积微相。对研究区内扇三角洲各沉积微相的沉积特征、纵横向展布规律进行研究,统计受沉积微相控制的储集层孔隙度、渗透率等物性数据,并结合各沉积微相的含油气性特征,指出水下分流河道微相及河口沙坝微相储集物性最好,并聚集了69.8%的的油气,为最有利的油气聚集微相。前缘席状砂微相、沙坝微相、沙滩微相及碳酸盐岩滩微相储集物性较好,属于中孔-中渗储层,为研究区的重要油气聚集微相。在前人确定研究区为扇三角洲沉积的基础上,将研究区内沉积相进一步划分至亚相与微相,并分析了不同亚相控制下的储层物性及含油性,为扇三角洲型油气勘探开发提供了依据。To study the influence of different sedimentary characteristics on reservoir development, a comprehensive analysis of sedimentary facies is carried out by using the logging data, testing data, and by observing rock core. Three kinds of sedimentary sub-facies were determined in the targeted geographical area. Nine kinds of sedimentary microfacies were further identified by comparing the lithological, electrical and sedimentary characteristics. The sedimentary characteristics and distribution law of the sedimentary microfacies in the fan-delta were studied, and the physical data of porosity and permeability of the reservoir controlled by the sedimentary microfacies were counted. Based on the sedimentary microfacies oil-gas characteristics, it was found that the underwater distributary channel microfacies and mouth-bar microfacies have the best reservoir physical property. The most favorable oil and gas gathering microfacies is resulted up to 69.8%. With good physical properties and being part of the middle pore- middle permeability reservoir, the leading edge sheet sand microfacies, sand bar microfacies, sand beach microfacies and carbonate rock beach microfacies were the major oil and gas accumulation microfacies in the targeted area. The fan-deltaic sedimentary facies were further divided to sub-facies and microfacies and the physical and oil properties of the reservoir controlled by different sub-facies were analyzed. The study in this paper provides reference for future fan-deltaic oil and gas exploration and development.

关 键 词：沉积微相 微相类型 储集特征 沙四上亚段 青东5块 

分 类 号：P618.13[天文地球—矿床学] TE122.1[天文地球—地质学]