有机质在页岩沉积成岩过程及储层形成中的作用

发布时间：2018-09-19 10:22

【摘要】：通过岩心、显微薄片及电镜样品的观察,结合定量分析测试结果,对有机质在页岩形成、演化及储层发育中重要作用进行研究。研究表明:有机质利于碳酸钙的沉淀,主要由底栖黏结、浮游黏结及生物颗粒3种形式形成碳酸盐,形成的岩石类型包括骨架岩、黏结岩和颗粒灰岩;有机质利于铁质络合物的形成,有机质热演化形成微环境促进碳酸盐矿物的黄铁矿交代;在埋藏演化过程中,有机质演化产生有机酸,对不稳定矿物进行溶蚀,继而发生重结晶作用,影响方解石的晶体大小和形态;有机质直接或间接地产生大量有效的储集空间,有利于页岩孔隙网络的形成,继而影响页岩的储集物性;页岩油产量受总有机碳含量(TOC)影响,建议页岩油形成并具备工业可采能力的TOC下限值为2%,同时也需要富有机质页岩具有稳定的厚度,还应考虑页岩矿物组成及岩石类型、镜质体反射率Ro等因素。
[Abstract]:The important role of organic matter in shale formation evolution and reservoir development is studied through observation of core microslice and electron microscope and quantitative analysis. The results show that organic matter is propitious to precipitate calcium carbonate, and carbonate is mainly formed by benthic bonding, planktonic bonding and biological particles. The rock types formed include skeleton rock, cemented rock and granular limestone. Organic matter is propitious to the formation of iron complex, the thermal evolution of organic matter forms microenvironment to promote pyrite metasomatism of carbonate minerals, and in the process of buried evolution, organic acids are produced by organic matter evolution, and the unstable minerals are dissolved, Recrystallization affects the crystal size and morphology of calcite, organic matter directly or indirectly produces a large number of effective reservoir space, which is conducive to the formation of shale pore network, and then affects the reservoir physical properties of shale. The production of shale oil is affected by total organic carbon content (TOC). It is suggested that the lower limit of TOC for shale oil formation and industrial recoverability is 2. At the same time, it is also necessary for organic shale to have a stable thickness, and shale mineral composition and rock type should be taken into account. Vitrinite reflectivity Ro and other factors.
【作者单位】：中国石油大学地球科学与技术学院;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;中国石油化工股份有限公司石油勘探开发研究院;中国地质大学(北京)能源学院;
【基金】：国家自然科学基金项目(41602142) 国家科技重大专项(2016ZX05006-007,2016ZX05006-003) 中国博士后基金项目(2015M582165,2017T100523) 山东省自然科学基金项目(ZR2016DB16)
【分类号】：P618.13

【相似文献】