HSS油田H1油层组储层特征研究

Reservoir characteristics of H1 oil measures in HSS Oilfield

李新虎 刘 东 郭 媛

西安科技大学地质与环境学院，陕西 西安 710054 2西北大学地质学系，陕西 西安 710069

School of Geology and Environment, Xi′an University of Science and Technology, Xi′an 710054, China Department of Geology, Northwest University, Xi′an 710069, China

HSS油田为低渗透砂岩油藏，H1油层组属于二叠系平地泉组上部，主要为三角洲前缘沉积。在野外剖面、钻井岩心详细观察的基础上，通过对岩石薄片鉴定、扫描电镜和物性等资料的综合分析，对岩石学特征和储层物性特征及其储层非均质性进行了详细研究。结果表明：H1油层组主要为浅灰色细砂岩，其次为少量的中砂岩和粉砂岩；储层物性较差，为中孔、低渗储层；成岩作用与黏土矿物对储集层物性具有重要的影响。根据岩心分析资料、测井资料，结合沉积微相研究，通过计算渗透率级差（JK）、渗透率变异系数（VK）和渗透率突进系数（TK）得到储层表现出强非均质性。沉积环境、粒度、填隙物和沉积相控制了储层的内部结构特征和储层非均质性，进而影响油藏的发育和分布。

HSS Oilfield is a low permeability sandstone reservoir. H1 oil measures in the top of Pingdiquan Formation of Permian are mainly delta front sediments. Based on the observation of outcrops and cores, through the integrated investigation such as rock thin section microscopic identification, scanning electron microscope and reservior property, the characteristics of lithology and physical properties and reservoir heterogeneity are studied in detail. The results show that H1 oil measures are dominated by light grey fine sandstone, then the medium sandstone and the siltstone. The reservoir physical properties are poor, that is to say, the studied area is a tight reservoir with middle porosity and low permeability. Diagenesis and clay mineral are the main factors which influence the reservoir property. The reservoir displays a strong heterogeneity according to the analysis of core data, logging data and sedimentary microfacies and through computing the differences, variation coefficient and mutation coefficient of permeability. The internal strutural characteristics and reservoir heterogeneity are controlled by sedimentary environment, grain size, interstitial material and sedimentary facies, and then the development and distribution of reservoir are affected.