黄陵-铜川地区延长组中下油层组致密储层成岩差异性  

Research on reservoir characteristics of Upper Triassic Yanchang Formation in Huangling-Tongchuan area of Ordos Basin, China

作　　者：吴颖 张金功[2] 尹锦涛 孙磊[4] WU Ying;ZHANG Jingong;YIN Jintao;SUN Lei(School of Earth Sciences and Engineering,Xian Shiyou University,Xian 710065,China;Department of Geology,Northwest University,Xian 710069,China;Research Institute of Shaanxi Yanchang Petroleum (Group) Co. Ltd.,Xian 710069,China;Research Institute of Exploration and Development,Changqing Oilfield Company,PetroChina,Xian 710018,China)

机构地区：[1]西安石油大学地球科学与工程学院,西安710065 [2]西北大学地质学系,西安710069 [3]陕西延长石油(集团)有限责任公司研究院,西安710069 [4]中国石油长庆油田分公司勘探开发研究院,西安710018

出　　处：《成都理工大学学报（自然科学版）》2019年第1期80-89,共10页Journal of Chengdu University of Technology: Science & Technology Edition

摘　　要：研究鄂尔多斯盆地南部黄陵-铜川地区上三叠统延长组储层类型、成岩特征及优质储层发育规律。通过对区内十余口钻井的岩心及地表剖面样品的薄片、阴极发光、扫描电镜及物性等分析,显示延长组中下油层组主要为岩屑长石砂岩和长石砂岩,储集空间主要为残余粒间孔隙、溶蚀粒间孔隙、溶蚀粒内孔隙、自生矿物晶间孔、裂缝孔隙以及填隙物内微孔。按储集空间类型及成因可分为残余原生粒间孔型储层(A类)、铁方解石强胶结型储层(B类)、压实致密型储层(C类)和裂缝-溶蚀型储层(D类)。这4类砂岩的成岩演化过程差异大,A类储层早期绿泥石包壳及早期油气充注减缓了储层压实作用,属边致密边充注型储层;B类储层的压实减孔和石英、长石的次生加大、黏土矿物堵塞喉道降低了储层物性,属早期致密型储层;中晚期铁方解石胶结是C类储层低渗的主控因素,属早期含水后期胶结致密型储层;晚期裂缝和酸性溶蚀是D类储层物性改善的主控因素,属先致密后充注型储层。The reservoir types, diagenetic characters and development regularity of reservoirs of the Upper Triassic Yanchang Formation in the Tongchuan-Huangling area of southern Ordos Basin are studied by means of analyses of thin sections, CL, SEM as well as physical property. It shows that the middle and lower oil-bearing formations of Upper Triassic Yanchang Formation in the study area are composed of lithic feldspathic sandstone and feldspathic sandstone. There are six types of reservoir space, including residual intergranular pore, intergranular pore, dissolved intergranular pore, authigenic mineral intergranular pore, fracture pore and interstitial micropore. The Yanchang Formation reservoirs can be divided into 4 types in terms of reservoir space and genesis; they are residual primary intergranular pore reservoir (Type A), ferrocalcite cementation reservoir (Type B), compacting reservoir (Type C) and fracture-dissolution reservoir (Type D) respectively. The early chlorite coating and hydrocarbon migration reduce compaction of Type A reservoir, and belongs to accumulating tight reservoir. Early compaction, quartz and feldspar overgrowths, and clay minerals reduce the porosity of Type C reservoir, and belongs to early density reservoir. The ferrocalcite cementation in the pores is responsible for the low permeability of Type B reservoir. Late stage dissolution and fractures create pore space for the Type D reservoir, and belongs to early density-late accumulation reservoir.

关 键 词：黄陵-铜川地区 延长组 低渗储层 成岩差异性 

分 类 号：TE122.23[石油与天然气工程—油气勘探] P588.2[天文地球—岩石学]