临南洼陷深层碎屑岩次生孔隙特征及其地质意义

Characteristics and petroleum significance of secondary pores
in deep clastic rock of Linnan Subsag

李家强

中国石油大学地球资源与信息学院，山东 东营 257019 胜利油田分公司地质科学研究院，山东 东营 257015

College of Geo-Resources and Information, China University of Petroleum, Dongying 257019, China Geological Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China

临南洼陷是惠民凹陷的主力生油洼陷，制约其深层勘探的关键因素是储集层的物性问题。以往认为，该区次生孔隙发育的底界深度为3 500~4 000 m，文章研究认为4 200 m以下仍然存在次生孔隙。本区次生孔隙主要发育2种类型：溶蚀孔和微裂隙。影响次生孔隙发育的主控因素有4个：沉积相带、成岩作用、构造作用及温度压力。对深层次生孔隙进行研究，可以拓展油气勘探的空间，具有重要的地质意义。

Linnan Subsag is the most important petroleum generative one in Huimin Sag. The key problem that restraints the deep oil exploration is the reservoir physical property. According to the viewpoint in the past, the basement depth of secondary pore developed in sandstones is 3500-4000m. But there still are the secondary pores below 4200m on the basis of the study of this paper. In this area, there are two types of pores, including the emposieus and microfractures. And the main controlling factors  affecting the secondary pores include the sedimentary facies, diagenesis, tectogenesis, temperature and pressure. The study of deep secondary pores can expand the petroleum exploration area and has the important geological value.