镰刀湾地区上古生界致密气储集砂岩孔隙差异特征及其控藏规律  

Difference pore characteristics and its control rule of tight sandstone gas reservoir in Liandaowan area

作　　者：徐鹏程 李超 刘金森 邵杰 刘朋 吴雨风 XU Pengcheng;LI Chao;LIU Jinsen;SHAO Jie;LIU Peng;WU Yufeng(Changqing Oilfield Branch Changqing Industrial Group Co.,Ltd.,Qingyang 745100,China;School of Earth Science and Resources,Chang'an University,Xi'an 710054,China)

机构地区：[1]长庆油田分公司长庆实业集团有限公司,甘肃庆阳745100 [2]长安大学地球科学与资源学院,陕西西安710054

出　　处：《甘肃科学学报》2024年第6期72-79,共8页Journal of Gansu Sciences

摘　　要：致密砂岩的孔隙演化过程影响致密天然气的富集及分布,是当前部署致密气储集砂体开发工作的研究重点。以镰刀湾地区上古生界盒8-山2段致密气储集砂岩为研究对象,通过气测孔渗、高压压汞数据结合岩石薄片及扫描电镜等显微观测,分析其物性特征,定性和定量表征孔隙特征,并探讨盒8-山2段孔隙差异特征的成因及其对致密气富集的影响。研究表明:镰刀湾地区上古生界盒8-山2段致密气储集砂岩为低孔-特低孔、低渗-特低渗储层。强压实作用和胶结作用分别是导致盒8-山2段砂岩气储集砂岩孔隙低孔化、特低孔化的主控因素,溶蚀作用是低孔型储集砂岩部分发育的主控因素;早期差异性胶结作用是储集砂岩孔隙差异演化的主要因素,也导致差异性溶蚀作用和晚期胶结作用的发生。胶结物含量高的储集砂岩含气性更好,其中无阻天然气主要赋存在晶间孔中,而更多的致密砂岩气主要赋存在胶结物溶蚀孔中。The pore evolution process of tight sandstone affects the enrichment and distribution of natural gas,which is the focus of the development of the deployed tight gas storage sand body.In Liandaowan area Upper Paleozoic He 8 to Shan 2 tihgt gas storage sandstone as the research object,through the gas pore permeability,high pressure mercury data with drilling core sheet and scanning electron microscope microscopic observation,this study analyzes the physical characteristics,qualitative and quantitative characterization of the pore,discusses the key factor and its effect on tight gas enrichment of pore difference evolution in He 8-Shan 2 member,in order to study the deployment of tight sandstone gas development scheme.The results show that Upper Paleozoic He 8 to Shan 2 tight gas reservoir sandstone is low hole-ultra low hole,low permeability-ultra low permeability reservoir.Strong compaction and cementation are the main control factors that lead to the low porosity and special low porosity of sandstone gas reservoir in He 8-Shan 2 section respectively,and dissolution is the main control factor for the development of low porous reservoir sandstone.Early differential cementing is the main factor of the differential evolution of stored sandstone pores,which also leads to the occurrence of differential dissolution and late cementation.And the reservoir sandstone with high cement content has better gas content,in which unimpeded natural gas mainly occurs in inter-crystal hole,while more tight sandstone gas mainly occurs in the cement dissolution hole.

关 键 词：鄂尔多斯盆地 致密砂岩气 上古生界 盒8段 山西组 孔隙差异演化 

分 类 号：P618.13[天文地球—矿床学]