玛湖凹陷二叠系乌尔河组典型致密砾岩储层敏感性实验研究  

Experimental Study on Reservoir Sensitivity of Typical Tight Conglomerate in Permian Wuerhe Formation,Mahu Sag

作　　者：常天全[1] 邹正银[1] 孔垂显[1] 胡龙杰 李胜[1] 张会勇[1] 刘灿华 蒋庆平[1] 惠婧 CHANG Tian-quan;ZOU Zheng-yin;KONG Chui-xian;HU Long-jie;LI Sheng;ZHANG Hui-yong;LIU Can-hua;JIANG Qing-ping;HUI Jing(Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China;Hebei GEO University,Shijiazhuang 050031,China)

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000 [2]河北地质大学研究生学院,河北石家庄050031

出　　处：《河北地质大学学报》2022年第6期33-40,共8页Journal of Hebei Geo University

基　　金：国家级一流本科课程“沉积岩岩石学”(教高函[2020]8号,冀教高函[2020]85号、[2020]25号);省级、校级教改项目(2020GJJG589,2020J03);省级研究生示范课程“沉积学原理”(KCJSX2021092);省级课程思政示范项目“沉积岩岩石学”(冀教高函[2021]62号)。

摘　　要：储层敏感性是影响非常规油气开发的关键因素之一,致密砾岩作为一种较为特殊的非常规油气储集层,因其复杂的结构组分和物性特点导致开发难度更大。论文选取玛湖凹陷玛湖1井区和玛东2井区二叠系乌尔河组发育的典型致密砾岩储层,通过岩心观察、铸体薄片鉴定和X衍射测试,明确其结构组分和孔隙发育特点及矿物含量,进而开展了基于核磁的储层岩石水敏特征定量评价实验研究。实验表明,样品岩心经历水敏伤害后的渗透率都比原始状态有明显下降,其下降幅度与储层敏感性黏土矿物的含量呈正相关;样品岩心孔隙度及分布频率较原始状态的变化则表现出并不完全一致的特点,很可能是胶结程度造成的。论文在充分考虑氦孔、液体饱和孔隙度、克氏渗透率和液体饱和液体渗透率等多项参数的前提下,根据水敏特征定义了新的水敏系数,且发现水敏系数同伊/蒙间层黏土在石英和黏土中占比的相关性最好。这为合理制定致密砾岩开发方案奠定了坚实的基础。Reservoir sensitivity is one of the key factors affecting unconventional oil and gas development.As a special unconventional oil and gas reservoir,tight conglomerate is more difficult to develop because of its complex structural components and reservoir physical properties.This article selects typical tight conglomerate reservoir of Permian Wuerhe formation in Mahu1 and Madong2 wellblock,through core observation,casting thin sections identification and X-ray diffraction test,clarifies its structure composition,pore development characteristics and mineral content,then carries out based on nuclear-magnetic water sensitivity of the reservoir rock characteristics of the quantitative evaluation of experimental research.The experimental results show that the permeability of sample cores after water sensitive damage decreases significantly compared with the original state,and the decrease degree is positively correlated with the content of sensitive clay minerals in reservoir.The variation of core porosity and distribution frequency is not completely consistent with that of the original state,which is probably caused by the degree of cementation.In this paper,a new water sensitivity coefficient is defined based on the characteristics of water sensitivity,and it is found that the water sensitivity coefficient has the best correlation with the proportion of interstratigraphic clay in quartz and clay,taking helium pore,liquid saturated porosity,Kirschke permeability and liquid saturated permeability into full consideration.This has laid a solid foundation for rationally developing tight conglomerate.

关 键 词：玛湖凹陷 乌尔河组 致密砾岩 储层敏感性 水敏系数 

分 类 号：TE132[石油与天然气工程—油气勘探]