川中地区下寒武统龙王庙组白云岩阴极发光特征与成岩作用

发布时间：2017-12-28 18:10

本文关键词：川中地区下寒武统龙王庙组白云岩阴极发光特征与成岩作用　出处：《成都理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：四川盆地中部地区寒武系龙王庙组白云岩储层是我国近年发现的重要天然气储层。本文在钻井岩心密集采样的基础上,以沉积岩石学、地球化学等理论为指导,结合前人研究成果,综合运用铸体薄片观察、阴极发光分析、微量元素分析等多种技术手段,详尽的研究了研究区白云岩的岩石学特征、阴极发光特征、微量元素特征、成岩流体类型和成岩作用类型,建立了成岩作用序列。结合钻井岩心观察、铸体薄片观察及阴极发光分析,将研究区的岩石类型划分为粉—细晶白云岩、富溶孔粉—细晶白云岩、粉—细残余砂屑白云岩和残余鲕粒白云岩,并详细阐述了各类岩石特征。通过微量元素分析和阴极发光分析发现:川中龙王庙组白云岩整体具有较高的Fe(均值952×10-6)、Mn(均值191×10-6)含量,同时整体具有较弱的阴极发光强度;各个类型白云岩发光情况各有不同,其中:结晶白云岩发光性最弱,富溶孔具有三类岩石中最强的发光强度,残余砂屑白云岩发光性介于二者之间,与其各自的Fe、Mn含量和Fe/Mn值相对应。因此龙王庙组储层的阴极发光特征主要受到岩石结构控制。结合阴极发光特征和碳氧同位素特征得出:川中地区龙王庙组地层先后经历了准同生阶段同生海水和大气淡水、准同生作用最后阶段的高盐度海水、表生作用阶段大气水、中—深埋藏作用阶段深部流体等复杂的流体影响。川中地区寒武系龙王庙组储层经历了包括压实作用和晚期胶结作用的破坏性作用;压溶作用、早期白云岩化作用、溶蚀作用、烃类充注作用、构造破裂作用等的建设性作用;泥晶化作用、早期胶结作用的保持性作用的一系列复杂的成岩作用过程。
[Abstract]:The dolomite reservoir of the Cambrian dragon Wang Miao formation in the Cambrian in the middle of the Sichuan basin is an important natural gas reservoir found in China in recent years. Based on the drilling core density sampling, the sedimentary petrology and geochemistry theory, combined with the previous research results, the integrated use of casting thin section observation, cathodoluminescence, a variety of techniques for trace elements analysis, an exhaustive study of the petrology, dolomite in the study area, the cathodoluminescence features of trace element characteristics, diagenetic fluid types and diagenesis, build the diagenesis sequence. Combined with drilling core observation, cast thin section observation and cathodoluminescence analysis, the rock types of the study area was divided into fine fine crystalline dolomite, rich pore fine fine crystalline dolomite, fine fine residual dolarenite dolomite and residual oolitic dolomite, and elaborates the characteristics of all kinds of rocks. Through the analysis of trace elements and the cathodoluminescence analysis found: Sichuan in Longwangmiao formation dolomite has a higher overall Fe (mean 952 x 10-6), Mn (mean 191 x 10-6) content, while the whole cathode has weaker luminous intensity; various types of dolomite emission situation is different, including: Crystal dolomite luminescence the weakest, rich pores have the strongest luminescence intensity of three rock types, between the residual dolarenite luminescence between the two, and their Fe, Mn content and Fe/Mn values. Therefore, the cathodoluminescence characteristics of the reservoir in the long Wang Temple formation are mainly controlled by the rock structure. Combined with cathodoluminescence features and characteristics of carbon and oxygen isotopes that Sichuan Longwangmiao formation has experienced penecontemporaneous stage with seawater and meteoric water, quasi final stage of syngenesis high salinity and supergenesis stage atmospheric water, and deeply buried fluid effects of deep fluid phase complex. Sichuan in the Cambrian Longwangmiao reservoir experienced including compaction and late cementation of destructive effects; early pressure solution, dolomitization, dissolution, hydrocarbon filling effect, tectonic disruption such as constructive role; role of maintaining micritization, early binding effect of a series of the complex diagenesis process.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P618.13

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