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通过对青藏高原羌塘盆地和措勤盆地的白云岩进行野外观察与描述 ,提出了研究区白云岩的纵、横向分布规律 ,总结了白云岩的岩石学特征。运用系统的室内分析、化验方法 ,应用结构标志、阴级发光标志、氧同位素标志有效地进行了白云岩成因判定。认为研究区的白云岩非原生成因 ,而均属于交代或白云化成因。根据白云岩中所含白云石的晶体大小、形态及内部结构划分了白云化阶段 :准同生阶段、成岩阶段和后生阶段 ,并总结了各阶段白云岩的特征 ,认为成岩阶段形成的白云岩是油气最有利的储集层。通过选取典型剖面 ,归纳出研究区白云岩的两种成因模式 :毛细管浓缩作用模式和混合水作用模式。
Through the field observation and description of the dolomites in the Qiangtang and Cuoqin basins of the Qinghai-Tibet Plateau, the vertical and horizontal distributions of the dolomites in the study area are proposed, and the petrological characteristics of the dolomites are summarized. The dolomite origin determination was effectively carried out by using the systematic laboratory analysis, the laboratory test, the application structure sign, the cathode luminous sign and the oxygen isotope sign. It is considered that the dolomite in the study area is non-native and accounts for the cause of dolomitization. According to the crystal size, morphology and internal structure of dolomite contained in dolomite, dolomitization stage is divided into: quasi-syngenetic stage, diagenetic stage and epigenetic stage, and dolomite characteristics of each stage are summarized. It is considered that the dolomite formed in diagenetic stage Is the most favorable oil and gas reservoir. By selecting typical sections, two types of genetic models of dolomite in the study area are summarized: the capillary concentration mode and the mixed mode of action.