古地理学报2016，Vol.18Issue(4)：569-580,12.DOI:10.7605/gdlxb.2016.04.042
辽河坳陷西部凹陷南段古近系沙河街组致密砂岩特征与成因机制
Characteristics and forming mechanism of tight sandstones in the Paleogene Shahejie Formation of southern West Sag,Liaohe Depression
摘要
Abstract
Low-yield and commercial oil flows have been discovered in the Paleogene Shahejie For-mation,southern West Sag,Liaohe Depression,Bohai Bay Basin.The reservoirs are typical tight sand-stone reservoirs characterized by low-ultralow porosity,extra-low-ultralow permeability and low pressure. Based on data of thin sections,SEM,grain size,mercury pressure analysis and physical property,the micro-characteristics and formation mechanisms of tight sandstones were analysed.The results show that:The tight reservoirs (with porosity value lower than 1 0%) are mainly distributed in the sag area;The for-mation of tight reservoirs are not controlled by factors such as mineral composition,grain size,grain sor-ting and roundness;Pore types mainly consist of secondary pores and pore structures are characterized by medium pore diameter, tiny throat and heterogeneous throat sorting; The tight sandstones are mainly formed through compactions and cementations and are thus categorized as diagenetic tight sandstones.关键词
致密砂岩/非常规油气/成因机制/西部凹陷/辽河坳陷/古近系Key words
tight sandstone/unconventional oil and gas/formation mechanism/West Sag/Liaohe Depression/Paleogene分类
能源科技引用本文复制引用
孟元林,王志轩,张凤莲,孟凡晋,焦金鹤,施立冬..辽河坳陷西部凹陷南段古近系沙河街组致密砂岩特征与成因机制[J].古地理学报,2016,18(4):569-580,12.基金项目
国家自然科学联合基金项目（批准号U1262106），国家自然科学基金项目（批准号41572135），国土资源部示范工程项目（编号1211302108019－2）资助。［Co-funded by the National Natural Science United Foundation of China （No．U1262106），the National Natural Sci-ence Foundation of China （No．41572135）and Demonstration Project of Ministry of Land and Resources （No．1211302108019－2）］ （）
