南堡凹陷南部不同构造带东二段储层孔隙结构差异及其对储层质量的影响  

Characteristics of pore structure differences in the 2th member reservoir of Oligocene Dongying Formation,southern Nanpu Sag: Implications for reservoir quality

作　　者：张艺楼 吴浩 纪友亮[1,2] 宋燕 孟令箭[4] 吴琳娜[4] ZHANG Yi-lou;WU Hao;JI You-liang;SONG Yan;MENG Ling-jian;WU Lin-na(College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;Key Laboratory of Mineral Resources in Western China(Gansu Province),School of Earth Sciences,Lanzhou University,Lanzhou 730000,China;Research Institute of Exploration and Development,PetroChina Jidong Oilfield Company,Tangshan 063004,China)

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]兰州大学地质科学与矿产资源学院,甘肃省西部矿产资源重点实验室,甘肃兰州730000 [4]中国石油冀东油田公司勘探开发研究院,河北唐山063004

出　　处：《岩石矿物学杂志》2020年第1期85-95,共11页Acta Petrologica et Mineralogica

基　　金：国家科技重大专项(2016ZX05006-006);中央高校基本科研业务费专项资金(lzujbky-2019-1)。

摘　　要：为阐明碎屑岩储层孔隙结构差异性及其对储层质量的影响,以南堡凹陷南部4号和2号构造带东二段碎屑岩储层为例,采用常规物性、铸体薄片、扫描电镜、压汞、粒度分析、X衍射等手段,在储层基本特征研究的基础上,对储层孔隙结构差异及其对储层质量的影响进行了研究。结果表明,4号构造带东二段以岩屑质长石砂岩为主,碎屑含量平均为Q40.6F30.1R29.3,平均成分成熟度0.69,2号构造带东二段则主要以长石质岩屑砂岩为主,碎屑含量平均为Q32.9F26.8R40.2,平均成分成熟度为0.49;4号构造带东二段主要以低渗砂岩储层为主,而2号构造带则以致密储层(渗透率小于1 m D)为主;4号构造带东二段砂岩储集空间主要以原生剩余粒间孔为主,且孔喉间的连通性相对较好,2号构造带砂岩储集空间则以粒间溶孔等次生孔隙为主,孔喉间的连通性较差;4号构造带东二段孔喉大小分布主要呈现单峰式,进汞增量主要集中在大于1μm的喉道半径范围,2号构造带东二段储层的孔喉分布也主要为单峰式,但进汞增量主要集中在小于1μm的喉道半径范围。整体上,造成南堡凹陷4号与2号构造带东二段储层差异的原因主要是微观孔隙结构的差异,而微观孔隙结构存在差异的原因是两个构造带东二段储层的沉积和成岩作用后期改造的不同。To reveal the difference of the second member of Dongying Formation reservoir development along No.4 and No.2 tectonic belts in Nanpu Sag,the authors used such means as rock flakes,cast sheet image analysis,scanning electron microscopy,X-ray diffraction,mercury intrusion,physical property analysis and other data to study the reservoir characteristics systematically.According to the results obtained,the No.4 structural belt is mainly composed of lithic feldspar sandstone,the average debris content is Q40.6F30.1R29.3,and the average component maturity is 0.69.The No.2 structural belt is mainly composed of feldspar lithic sandstone,the average debris content is Q32.9F26.8R40.2,and the average component maturity is 0.49.The No.4 structural belt is mainly composed of lowpermeability sandstone reservoirs,while the No.2 structural belt is dominated by tight reservoirs( permeability less than 1 mD).The sandstone reservoir space of the No.4 structural belt is mainly composed of primary residual intergranular pores,and the connectivity between pore throats is relatively good.In the No.2 structural belt,the sandstone reservoir space is also mainly composed of intergranular dissolved pores,but the connectivity between pores and throats is poor.The distribution of pore throat size of the second member of the No.4 structural belt is mainly unimodal,and the increase of mercury intrusion is mainly concentrated on the throat radius of more than 1 μm.The pore throat distribution of the No.2 structural belt is also mainly unimodal,but the increase in mercury is mainly concentrated on the throat radius of less than 1 μm.On the whole,the difference between the second member of Dongying Formation reservoir in the No.4 and No.2 structural belts in the Nanpu Sag is mainly the difference in microscopic pore structure.The reason for this difference lies in the difference between the sedimentary and diagenetic reformations of the Paleogene Ed2 reservoirs of the two tectonic belts.

关 键 词：孔隙结构 储层质量 东二段 南堡凹陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]