油砂山地区浅水三角洲￣滨浅湖沉积及其对储层的控制

Shallow delta-lacustrine system sedimentary and its effect on Youshashan Formation in Youshashan Region, Qaidam Basin

宋光永 朱超 李森明 王艳清 夏志远 潘科

中国石油杭州地质研究院，浙江 杭州 310023 中国石油青海油田分公司勘探开发研究院，甘肃 敦煌 736202

Hangzhou Research Institute of Geology, PetroChina, Hangzhou 310023, China Research Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang 736202, China

陆相湖盆浅水三角洲￣滨浅湖沉积特征及储层发育规律研究，对于油气勘探开发具有指导意义。以大量钻井取心、测井及实验测试资料为基础，分析了柴达木盆地油砂山地区上新统浅水三角洲￣滨浅湖滩坝体系沉积微相、分布及演化特征、对储层的控制作用。结果表明，浅水三角洲与滨浅湖沉积在砂地比、层理构造、微观结构、测井相等方面可有效区分。上新统依次发育滨浅湖沉积、滨浅湖与三角洲前缘过渡沉积、三角洲前缘沉积的进积层序。受沉积控制，储层成分成熟度不高，成岩作用具碱性成岩特征；沉积微相及胶结物体积分数是储层物性的关键影响因素。

The study of sedimentary characteristics and reservoir development of shallow delta-lacustrine system is very important for the petroleum exploration and development of continental lacustrine basin. Based on a large number of drilling cores, logging and experimental analysis, the sedimentary microfacies types, sedimentary characteristics, the distribution and evolution characteristics of delta-front and shore-shallow lacustrine sediments in Youshashan Formation of Yingdong Area are summarized. The result shows that there is a big difference between the delta front and the shore-shallow lacustrine deposits in the sand ratio, stratum structure, microstructure, logging curve combination form and so on. The Pliocene successively developed the progradation sequence of shore-shallow lacustrine deposit, the transition of shore-shallow lacustrine and delta-front deposit. Under the control of deposition, reservoir maturity is not high and diagensis is of alkaline diagenetic characteristics. Microfacies and cement content are the key factors affecting reservoir physical properties.

10.6056/dkyqt201802003