摘要
鄂尔多斯盆地环县—贺旗地区长8油层低渗油气勘探获得重大突破,为了实现其效益开发,针对区内物源、沉积和储层特征研究不系统、认识总结不清楚等问题,开展了储层岩石学特征、重矿物组合、稀土元素、古生物遗迹、沉积结构构造、微观孔隙结构及成储主控因素等由宏观到微观的源储系统研究。结果表明1)长8沉积期环县—贺旗地区发育了西—西南物源供给的辫状河平原—辫状河三角洲前缘—浅水湖泊沉积体系;2)水下分流河道微相控制了低孔、低渗型储层的主体分布;3)残余原生粒间孔与次生溶孔为储层主要储集空间类型。以此为基础,通过聚类分析对区内500口井钻遇储层开展分类评价,并对有效储层的分布进行预测,对研究区低渗油气藏的开发提出科学建议。
Low permeability oil and gas exploration of Chang8 oil formation has achieved a major breakthrough in Huanxian-Heqi Area of Ordos Basin.In order to realize its beneficial development,the author aims at the problems of unsystematic and unclear understanding of provenance,sedimentation and reservoir characteristics.In this paper,the petrological characteristics,heavy mineral assemblages,rare earth elements,paleontological remains,sedimentary structures,microscopic pore structures and reservoir forming factors are systematically studied.The results show that:1)The sedimentary system of braided river plain,braided river delta front and shallow water lake was developed in the study area.2)Underwater distributary channel microfacies controls the main distribution of low porosity and low permeability reservoirs.3)Residual primary intergranular pores and secondary dissolved pores are the main types of reservoir space.This paper classifies and evaluates more than 500 reservoirs drilled by wells through cluster analysis,predicts the distribution of effective reservoirs,and puts forward scientific suggestions for oil and gas reservoir development.
作者
吴天琦
何江
赵忠军
闫荣辉
姚坚
何建华
WU Tianqi;HE Jiang;ZHAO Zhongjun;YAN Ronghui;YAO Jian;HE Jianhua(School of Geosciences and Technology,Southwest Petroleum University,Chengdu 610500,China;China National Petroleum Corporation, Changqing Oilfield Company, Xi’an 710000,China;College of Energy,Chengdu University of Technology,Chengdu 610059,China)
出处
《非常规油气》
2022年第4期46-57,共12页
Unconventional Oil & Gas
关键词
环县—贺旗地区
长8油层组
物源
沉积微相
储层评价
Huanxian-Heqi Area
Chang8 oil formation
sand source
sedimentary microfacies
reservoir evaluation
