鄂尔多斯盆地杭锦旗西部山西组致密砂岩储层特征及物性控制因素  

Tight sandstone reservoir characteristics and physical property control factors of Shanxi Formation in western Hangjinqi,Ordos Basin

作　　者：宗廷博 陈德照 杨頔 张占杨 李志宏 王瑞飞[1] 甄园水 ZONG Tingbo;CHEN Dezhao;YANG Di;ZHANGZhanyang;LI Zhihong;WANG Ruifei;ZHEN Yuanshui(Faculty of Petroleum Engineering,Xi’an Shiyou University,Xi’an 710065,China;No.8 Oil Production Plant of Changqing Oilfield Branch of PetroChina,Xi’an 710000,China;Exploration and Development Research Institute,SINOPEC North China Company,Zhengzhou 450006,China;China National Logging Corporation Geology Research Institute,Xi’an 710077,China;Research Institute of Exploration and Development of Yumen Oilfield Company,PetroChina,Jiuquan 735019,China)

机构地区：[1]西安石油大学石油工程学院,陕西西安710065 [2]中国石油长庆油田分公司第八采油厂,陕西西安710000 [3]中国石化华北油气分公司勘探开发研究院,河南郑州450006 [4]中油测井地质研究院,陕西西安710077 [5]中国石油玉门油田分公司勘探开发研究院,甘肃酒泉735019

出　　处：《天然气地球科学》2024年第4期608-622,共15页Natural Gas Geoscience

基　　金：陕西省重点研发计划重点产业创新链(编号:2022ZDLSF07-04)资助。

摘　　要：鄂尔多斯盆地杭锦旗西部地区是近几年天然气勘探与开发的重点区域。山西组上部砂岩为主要含气层,下部煤层为主要气源岩,具有储层致密、非均质性强的特征。目前针对杭锦旗西部地区山西组储层特征及有效储层成因尚缺乏系统研究,制约了该地区后期油气勘探进程。综合利用钻测井、岩心资料、岩石铸体薄片、扫描电镜、物性测试及压汞等多种分析测试资料,系统分析了杭锦旗西部地区山西组储层的岩石学、物性及成岩作用等特征,在此基础上明确了其优势储层成因。结果表明:优势储层主要分布在心滩和河道砂体,以砂砾岩和中粗砂岩为主;储集空间以粒间孔为主,渗透率主要分布于(0.2~2.4)×10^(-3)μm^(2)之间,属于低—特低渗储层,孔喉组合关系以细孔—中小喉为主,微裂缝较发育;储层整体成岩作用较为复杂,包括压实、胶结、交代蚀变和溶蚀作用,储层整体处于中成岩B期;优势储层主要为粒间孔隙,主要受控于沉积作用,溶蚀孔的发育也是储层物性得以改善的主要原因,受到沉积作用、成岩作用的双重控制。The western part of the Hangjinqi area of the Ordos Basin is the key area for natural gas exploration and development in recent years.The upper sandstone of the Shanxi Formation is the main gas-bearing layer,and the lower coal seam is the main gas source rock,which has the characteristics of tight reservoir and strong heterogeneity.At present,there is still a lack of systematic research on the reservoir characteristics and effective reservoir genesis of the Shanxi Formation in the western part of Hangjinqi area,which restricts the late oil and gas exploration process in this area.Therefore,this study comprehensively analyzed the petrology,physical properties and diagenetic characteristics of the reservoir of the Shanxi Formation in the western part of Hangjinqi area by comprehensively using various analysis and test data such as drilling and logging data,core data,rock casting sheets,scanning electron microscopy,physical property test,mercury pressure and clarified the origin of its dominant reservoir.The results show that the dominant reservoirs are mainly distributed in the heart beach and river channel sand,mainly sandstone and medium coarse sandstone.The reservoir space is mainly intergranular pores,and the permeability is mainly distributed in(0.2-2.4)×10^(-3)μm^(2),which belongs to low-ultra-low permeability reservoirs,the pore-throat combination relationship is mainly porous-medium and small larynx,and the micro-fractures are relatively developed.The overall diagenesis of the reservoir is complex,including compaction,cementation,alternating alteration and dissolution,and the reservoir as a whole is in the B stage of middle diagenetic.The dominant reservoir is mainly intergranular pores,which are mainly controlled by sedimentation,and dissolution pores are also the main reasons for improving the physical properties of the reservoir,which are controlled by sedimentation and diagenesis.

关 键 词：储层特征 山西组 致密砂岩 杭锦旗 鄂尔多斯盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]