西藏布若错地区布曲组碳酸盐岩微相与沉积环境

碳酸盐岩薄片显微镜研究,为微相分析提供了十分重要的基础资料。本文采用微相分析的方法,对西藏布若错地区布曲组碳酸盐岩的微相类型和沉积环境进行了研究,选择布曲组地层完整的独雪山剖面岩石薄片详细分析,在显微镜下对其颗粒成分、生物组合、基质类型及结构特征等进行深入观察,划分出10种碳酸盐岩微相类型,依据各微相特征和实测剖面资料,结合前人的研究,认为布曲组碳酸盐岩形成于缓坡相沉积环境,分出5种亚相并细分出4种沉积微相,由此得出布曲组沉积环境变化,为区域地质研究和石油普查提供重要的基础资料。

the Carbonate Microfacies and Sedimentary Environments of Buqu Formation in Buruocuo Tibet

The observation of Carbonate thin sections under the microscope, as a basic method, that could provide a very important information for microfacies analysis. Through the method of microfacies analysis, we study the Carbonate microfacies and sedimentary environments of Buqu Formation in Buruocuo, Tibet. Ten kinds of Carbonate microfacies have been divided according to observation under a microscope of its grains, biological combination, matrix type and structural characteristics through rock thin sections from Buqu Formation in Duxueshan area. According to the characteristics of each microfacies and measured section, combing previous studies, we think that the Buqu Formation carbonates formed in ramp facies sedimentary environments and five subfacies and four sedimentary microfacies are proposed. Basing the above research finding, we derived the sedimentary environmental change in Buqu formation, and hoping it could provide important basic information for regional geological research and oil censuses.