沉积与特提斯地质2018，Vol.38Issue(2)：36-44,9.
羌塘盆地昂达尔错地区白云岩成岩结构特征及其成因意义
Diagenetic fabrics and genetic significance of the dolostones from the Angdaerco area in the Qiangtang Basin
摘要
Abstract
Six types of diagenetic fabrics have been distinguished for the dolostones from the Angdaerco fossil oil reservoirs in the Qiangtang Basin according to thin section,cathodoluminescence,back scattered electron images and scanning electron microscopy analysis,in integration with crystal size,crystal shape,crystal surface,contact relationship and relevant genetic information. They include power to fine- crystalline nonplanar anhedral fabric;power to fine-crystalline nonplanar fogged center-clear margin fabric;fine-to medium-crystalline planar subhedral-euhedral fabric;fine- to medium-crystalline planar fogged center-clear margin fabric;fine- to medium-crystalline planar subhedral-euhedral zonal fabric, and medium- to coarse-crystalline nonplanar anhedral fabric. The diagenetic fabrics outlined above suggest that the dolomite in this area should be the result of the replacement of calcite by evaporated salted seawater,and be transformed by multistage diagenetic fluids within different genetic models,including evaporated salted seawater genetic model in the penecontemporaneous stage;seepage reflux genetic model in the shallow burial stage;burial dolomitization genetic model in the medium to deep burial stage, and hydrothermal metasomatism genetic model associated with tectonic movement in deep burial stage. Residual granular structure and algal-laminated structure in the dolostones have disclosed that original high-energy sedimentary environments such as the shoal facies,tidal flat facies and bioclastic shoal facies are more conductive to the formation of the dolostones in the study area,and that the development of dolomitization and spatial distribution of dolostones are generally controlled by the original sedimentary microfacies and rock types.关键词
白云石/结构类型/成因意义/羌塘盆地/布曲组Key words
dolomite/diagenetic fabric type/genetic significance/Qiangtang Basin/Buqu Formation分类
天文与地球科学引用本文复制引用
王东,万友利,付修根,冯兴雷,陈文彬..羌塘盆地昂达尔错地区白云岩成岩结构特征及其成因意义[J].沉积与特提斯地质,2018,38(2):36-44,9.基金项目
"羌塘盆地金星湖-隆额尼地区油气资源战略调查"项目(编号:DD20160159) （编号:DD20160159）
