吴起油田白河北部长8储层特征及其控制因素研究  

A study on the characteristics of the Chang 8 reservoir in Baihe north,Wuqi oilfield and its controlling factors

作　　者：张文奕 高胜利 廖保江 孙兵华 白江[2] ZHANG Wen-yi;GAO Sheng-li;LIAO Bao-jiang;SUN Bing-hua;BAI Jiang(Xi′an university of petroleum,school of geosciences and engineering/Key laboratory of oil and gas formation and reservoir geology of Shaanxi Province,Xi′an petroleum university,Xi′an 710065,Shaanxi;Yanchang Oilfield Co.,Ltd Wuji Oil Production Plant,yan′an 717600,Shaanxi)

机构地区：[1]西安石油大学地球科学与工程学院/陕西省油气成藏地质学重点实验室,陕西西安710065 [2]延长油田股份有限公司吴起采油厂,陕西延安717600

出　　处：《地下水》2024年第1期144-147,共4页Ground water

基　　金：陕西省自然科学基础研究计划:一般项目(面上),(2019JM-359);延长油田股份有限公司吴起采油厂白河北部长8油藏注水开发调整技术与对策研究,(ycsy2019ky-C-02-02)。

摘　　要：为对吴起油田长8地区的储层特征存进行进一步深入的了解,利用研究区内高压压汞、岩石薄片、铸体薄片以及物性特征等资料,对吴起油田白河北部长8储层的岩石学特征、孔隙类型及结构、孔渗特征等进行研究,并对可能影响储层物性的因素进行讨论,得出:沉积微相和成岩作用是影响该储层的主要因素。储层特征:分流间湾、下分流河道和远砂坝是白河北部长8沉积微相主要的存在形式,其河口坝的发育程度较低,以浅灰、灰色细粒长石砂岩和岩屑长石砂岩为主要的岩石类型,研究区孔隙类型以岩屑溶孔、长石溶孔、粒间孔隙居多,晶间孔的数量较少,可见少量的微裂隙。总体上看长8储层的类型属特低孔、超低渗致密储层。分析研究范围各小层的物性可得,其中长8_(2)^(2)物性最好。In order to gain further insight into the reservoir characteristics inventory in the Chang 8 area of the Wuqi oilfield,the lithological characteristics,pore types and structures,and pore seepage characteristics of the Baihe North Chang 8 reservoir in the Wuqi Oilfield were studied using information on high-pressure piezometric mercury,rock thin sections,cast thin sections and physical characteristics in the study area,and factors that may affect the reservoir physical properties were discussed,resulting in:divergent interbay,lower divergent channel and far Sand dams are the main manifestation of the sedimentary microphase of the Minister 8 in the north of the Baihe River,and its estuarine dams are less developed,with light grey and grey fine-grained feldspathic sandstone and rock chip feldspathic sandstone as the main rock types.The pore types in the study area are mostly rock chip solution pores,feldspathic pores and intergranular pores,with a smaller number of intergranular pores and a small number of microfractures visible.In general,the type of the Chang 8 reservoir is a very low-porosity,ultra-low-permeability dense reservoir.Analysis of the physical properties of the small layers in the study area reveals that Chang 8_(2)^(2) is the best.

关 键 词：白河油区 延长组 长8 储层特征 控制因素 

分 类 号：P618.130.21[天文地球—矿床学]