川东地区五峰组页岩储层特征研究

发布时间：2018-05-27 10:05

本文选题：储层特征 + 孔隙控因　；参考：《中国矿业大学》2017年硕士论文

【摘要】：以川东上奥陶统五峰组页岩为研究对象,在前人工作的基础上,通过典型野外剖面的精细观察与系统采样工作,运用X-射线衍射、扫描电镜、氩离子抛光-场发射扫描电镜、高压压汞、低温氮吸附等多种测试技术,对研究区五峰组页岩的物质组成、孔隙特征与成岩演化进行了系统研究。研究表明:川东地区五峰组页岩形成于碳酸盐补偿界面之下的缺氧滞留还原环境。其物质组成以黏土矿物为主,含量平均达62.83%,主要为伊利石;脆性矿物含量平均29.85%,以石英为主;无机矿物组分含量在纵向上基本稳定。总有机碳含量(TOC)平均为4.33%,有机质类型均属腐泥型(I型),有机质等效镜质组反射率(RO)1.87%~2.67%,有机质热演化进入过成熟时期,处于热裂解干气生成阶段;总有机碳含量(TOC)在纵向上表现为由老至新逐渐减少。页岩储层宏观上以页理缝和构造缝为主;微观孔裂隙包括无机孔隙、有机质孔隙、微裂缝3种,其中无机孔隙主要包括粒间孔、粒内孔和黏土矿物晶间孔等类型。储层孔隙度5.44%,孔容分布在7.8×10-4~66×10-4cm3/g之间,30nm以下的小孔、微孔极为发育。储层主要经历了压实、溶蚀以及黏土矿物转化等成岩作用改造,处于成岩晚期。影响五峰组页岩微观孔隙发育影响因素众多,主要体现在物质组成、有机质丰度与成熟度和沉积-成岩作用三个方面。总有机碳含量(TOC)对储层储集性能起到了较为明显的贡献程度,且黏土矿物对储层孔隙发育起到贡献作用的主要是黏土矿物之间的相互转化以及后期流体介质化学性质变化导致溶蚀所产生的晶间孔隙。页理缝与笔石的发育在横向上对页岩储层渗透率起到了积极贡献作用。
[Abstract]:Taking the upper Ordovician Wufeng formation shale in eastern Sichuan as the research object, on the basis of previous work, through the fine observation of typical field profile and systematic sampling work, using X- ray diffraction, scanning electron microscope, argon ion polishing and field emission scanning electron microscope, The material composition, pore characteristics and diagenetic evolution of Wufeng formation shale in the study area were systematically studied by means of high pressure mercury injection and low temperature nitrogen adsorption. The results show that the shale of Wufeng formation in East Sichuan is formed in the environment of anoxic retention and reduction under the carbonate compensation interface. Its composition is mainly composed of clay minerals, with an average content of 62.83, mainly Illite, brittle minerals with an average of 29.85 and quartz as the main component, and inorganic mineral components are basically stable in the longitudinal direction. The total organic carbon content (TOC) is 4.33%, the organic matter type belongs to the sapropelic type I type, the equivalent vitrinite reflectance of organic matter is 1.87% and 2.67%, the thermal evolution of organic matter enters into the over-mature stage, and the organic matter is in the stage of pyrolysis dry gas generation. The total organic carbon content (TOC) decreased gradually from old to new. The micropore fractures include inorganic pores, organic pores and micro-fractures, among which inorganic pores are mainly composed of intergranular pores, intragranular pores and intergranular pores of clay minerals. The porosity of the reservoir is 5.44, and the pore volume is distributed between 7.8 脳 10 ~ (-4) ~ 66 脳 10-4cm3/g and below 30 nm, and the micropore is extremely developed. The reservoir underwent diagenesis such as compaction, dissolution and clay mineral transformation, and was in late diagenesis. There are many factors affecting the development of shale micropores in Wufeng formation, which are mainly reflected in three aspects: material composition, organic matter abundance and maturity, and sedimentation-diagenesis. Total organic carbon content (TOC) plays an important role in reservoir performance. The clay minerals contribute to the development of reservoir pores mainly due to the intergranular pores caused by the intergranular transformation between clay minerals and the chemical properties of fluid media. The development of phyllicite and graptolite plays a positive role in the permeability of shale reservoir.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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