川南地区五峰组—龙马溪组黑色页岩纹层特征及其储集意义  

THE CHARACTERISTICS OF LAMINAE AND ITS RESERVOIR SIGNIFICANCE IN BLACK SHALE: TAKING THE WUFENG-LONGMAXI FORMATIONS IN THE CHANGNING-SHUANGHE SECTION AS AN EXAMPLE

作　　者：林长木 王红岩[3,4] 梁萍萍 施振生[3,4] 孙莎莎[3,4] 刘德勋 LIN Chang-mu;WANG Hong-yan;LIANG Ping-ping;SHI Zhen-sheng;SUN Sha-sha;LIU De-xun(University of Chinese Academy of Sciences, Beijing 100049;Department of Porous Flow & Fluid Mechanics of Chinese Academy of Sciences, Langfang 065007;Petrochina Research Institute of Petroleum Exploration and Development, Langfang 065007;National Energy Shale Gas R&D (Experiment) Center, Langfang 06500)

机构地区：[1]中国科学院大学,北京100049 [2]中国科学院渗流流体力学研究所,河北廊坊065007 [3]中国石油勘探开发研究院,河北廊坊065007 [4]国家能源页岩气研发(实验)中心,河北廊坊065007

出　　处：《地层学杂志》2019年第2期133-140,共8页Journal of Stratigraphy

基　　金：国家科技重大专项“四川盆地及周缘页岩气形成富集条件、选区评价技术与应用”(2017ZX05035);国家重点基础研究发展计划(973计划)“中国南方海相页岩气高效开发的基础研究”(2013CB228000)

摘　　要：以四川盆地南部长宁双河剖面五峰组-龙马溪组为例,通过常规标准薄片及大薄片镜下观察、X射线衍射全岩分析、TOC及物性测试等方法,对黑色页岩纹层特征及储层物性和可压裂性进行了研究。结果表明,五峰组-龙马溪组纹层具有富硅质纹层、富钙质纹层及富黏土纹层三种类型,主要呈板状、断续、平行等几何形态,以毫米级纹层为主,富硅质纹层发育大量天然微裂缝。通过组合叠置可形成硅质-黏土纹层组合和碳酸盐-黏土纹层组合,其中硅质-黏土纹层组合物性和可压裂性均优于碳酸盐-黏土纹层组合。五峰组以碳酸盐-黏土纹层组合为主,天然裂缝整体不发育,由底至顶, TOC值逐渐增加,至观音桥段TOC值下降,物性变差;龙马溪组LM1-LM5以硅质-黏土纹层组合为主,低角度裂缝发育,由底至顶,逐渐过渡为碳酸盐-黏土纹层组合, TOC值降低,物性变差。Taking the black shale of the Wufeng to Longmaxi formations in the Changning-shuanghe section as an example, the laminae features, reservoir properties and the fracability are researched through petrological methods such as petrographic microscopic observations on standard-size thin sections(48 mm × 26 mm) and larger polished thin sections(76 mm × 48 mm), X-ray diffraction whole rock mineral analysis, TOC contents test and the property analysis of porosity and permeability. The results of the study show that Wufeng-Longmaxi shale develops three types of lamina: silica-rich lamina, carbonate-rich lamina and clay-rich lamina. Within their relatively small lateral extent, laminae mainly present as planar, discontinuous and parallel.The thickness of laminae ranges from 0.08 mm to 2.2 mm. Silica-rich laminae develop natural fracture. There are two types of laminaset: silica-clay laminaset and carbonate-clay laminaset, the reservoir property and fracability of silica-clay laminasets are better than carbonate-clay laminasets. From the bottom to the top,Wufeng Formation mainly consists of carbonate-clay laminasets, lacks of natural fracture and has the decreasing TOC contents and worsening reservoir property. LM1-LM5 mainly consists of silica-clay laminasets, develops dip-angle fractures, gradually transits from silica-clay laminasets to carbonate-clay laminasets and has decreasing TOC contents and worsening reservoir property.

关 键 词：川南地区 五峰组 龙马溪组 纹层 纹层组合 物性 可压裂性 

分 类 号：P534.42[天文地球—古生物学与地层学]