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西峰东部长8油层组成岩作用特征及对储层的影响 被引量:3

The diagenetic characteristics of Chang 8 oil layer and its influence on the reservoir, eastern Xifeng area, Ordos Basin, China
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摘要 研究鄂尔多斯盆地西峰东部长8油层组成岩作用类型及其对储层的控制作用,寻找优质储层发育区。通过铸体薄片、扫描电镜、X射线衍射及流体包裹体等分析手段,对长8油层组成岩作用特征进行研究,长8油层组储集砂岩处于中成岩阶段B期,先后经历了压实、胶结、压溶、交代、溶蚀、自生矿物的充填及破裂等成岩作用,其中压实作用、胶结作用、溶蚀作用及破裂作用对储层的影响最大。压实作用及碳酸盐的早期胶结作用是导致砂岩,特别是薄层砂岩快速致密化的主要原因;伊利石、伊/蒙混层矿物和高岭石的充填胶结,容易降低储层渗透性,对储层造成较大伤害;早期绿泥石环边的胶结作用有利于原生粒间孔隙的保存,溶蚀作用对改善储层物性具有积极意义,而破裂作用有利于提高储层渗透性和溶蚀作用的进行。研究区西南部是优质储层发育的主要区域。 Types of diagenesis and their control on the Chang 8 reservoir in the eastern part of Xifeng area of Ordos Basin are studied by means of casting thin section,scanning electron microscope,X-ray diffraction and temperature measurement of fluid inclusions in order to search for high quality reservoir development area.It shows that the Chang 8 reservoir sandstones in the studied area is currently in the middle diagenetic stage B,with diagenetic types of compaction,cementation,compression dissolution,metasomatism,dissolution,filling and fracturing of authigenic minerals.Of the diagenetic types,compaction,cementation,dissolution and fracturing have the greatest influence on the reservoir development.Compaction and early cementation of carbonate are the main reasons for the rapid densification of sandstones,especially for the thin bedded sandstone.The filling cementation of illite,imonite and kaolinite brings about the reduction of permeability of the reservoir and therefore lower the quality of reservoir.The early cementation of the chlorite rim plays a role in the preservation of primary intergranular pores.Dissolution is of positive role in improving reservoir property,and the fracturing is favorable for the increment of reservoir permeability and dissolution.It is considered that the southwest region of the study area is the main potential target for the development of high quality reservoir.
作者 周树勋 郑荣才 高进省 邓宝康 郭愿刚 王昌勇 马茗茗 ZHOU Shuxun;ZHENG Rongcai;GAO Jinsheng;DENG Baokang;GUO Yuangang;WANG Changyong;MA Mingming(Reservoir Development Department of Changqing Oilfield,CNPC,Xi an 710018,China;Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China;Sichuan Ogete Oilfield Development Technology Co.Ltd.,Chengdu 610041,China)
出处 《成都理工大学学报(自然科学版)》 CAS CSCD 北大核心 2019年第6期711-721,733,共12页 Journal of Chengdu University of Technology: Science & Technology Edition
基金 国家科技重大专项(2016ZX05007G003)
关键词 致密化 碳酸盐胶结 绿泥石环边胶结 破裂作用 长8油层组 西峰 densification carbonate cementation cementation of chlorite rim fracturing Chang 8 reservoir Xifeng
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