摘要
鄂尔多斯盆地定边—吴起地区长6_1油藏平面上具有明显的分区性。在岩心观察的基础上,结合大量荧光照片、铸体薄片、扫描电镜、压汞资料以及常规物性分析测试数据,分析了长6_1不同区块储层物性、砂体厚度、泥质含量的差异,明确了储层含油性差异的影响因素。结果表明,长6_1整体属于低孔低渗储层,主要发育粒间孔和长石溶孔;储层特征具有明显的分区性,自东向西,长石含量逐渐降低,石英、岩屑和填隙物含量逐渐增加;东部区块储层物性好,排替压力低,孔隙结构好,其次为西部,中部物源交汇处储层质量最差。含油性差异与储层特征分区性密切相关,东部区块砂体厚度大、泥质含量低、物性好,储层含油性最好,中部物源交汇区因水动力的相互抵消,泥质快速堆积,砂体薄且纹层发育,物性差,储层含油性差,以产水井为主。储层含油性主要受砂体厚度、泥质含量以及储层物性综合控制,该成果为研究区下一步油气勘探提供重要借鉴意义。
Chang 61 reservoirs distributed in Dingbian-Wuqi area are obvious zoning with clear major controlling factors. Core observation,a number of fluorescence images,cast sections,scanning electronic microscope observation,mercury injection data and physical property data were used to analyze the differences of physical property,sand body thickness and mudstone content of Chang 61 reservoir among different blocks,to determine the influencing factors of gas-bearing ability differences. The results show that it is characterized by low porosity and low permeability with intergranular pores and feldspar solution openings developed. Reservoir characters are obviously divided according to districts. The contents of quartz,debris and matrix increase while feldspar content decreases from eastern part to western part where the physical properties are poor. Eastern part has the best physical properties with low displacement pressure and good pore structure while intersection area in the middle has the worst physical properties. It is demonstrated that oil-bearing ability differences are closely associated with reservoir zoning characters. Sand bodies in eastern part are characterized by great thickness,low shale content,good physical properties and best oil-bearing ability. Because of the counteract of water power and fast accumulation of shale,the intersection area where the physical properties are poor with thin sand bodies and lamina is mainly consist of water wells. Reservoir oil-bearing ability is mainly affected by sands body thickness,shale content and reservoir properties. This research has some references for the next exploration.
作者
姚泾利
李勇
陈世加
邱雯
苏恺明
何清波
YAO Jingli1,2, LI Yong3, CHEN Shijia3, QIU Wen3, SU Kaiming3, HE Qingbo3(1. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi＇ an 710018, China 2. National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Xi＇ an 710018, China; 3. School of Geosciences and Technology, Southwest Petroleum University, Chengdu 610500, Chin)
出处
《岩性油气藏》
CSCD
北大核心
2018年第4期56-64,共9页
Lithologic Reservoirs
基金
国家重大科技专项"岩性油气藏油气成藏主控因素与富集机理"(编号:2017ZX05001002-003)和"大型油气田及煤层气开发"(编号:2016ZX05050)联合资助
关键词
储层特征
含油性
控制因素
长61油层
鄂尔多斯盆地
reservoir characteristics
reservoir oil-bearing ability
controlling factors
Chang 61 reservoir
Ordos Basin
