关键词: 生沥青, 地质意义, 镜质体反射率, 南盘江坳陷, 二叠系, 构造变质, 显微结构, 生油岩, 方解石, 溶蚀孔隙

Abstract: Solid asphalt is widely dispersed over Carboniferous and Permian formations in Wenliu structure of Nanpanjiang depression. It has been discovered that there are six types of occurrence in field survery and six micro-textures in microscope observation. Wenliu asphalts is a type of highly metamorphosed carbonaceous asphalt and anthraxolite according to the physical properties, determined by x-ray diffraction, C^-, H^- analysis and the measuring of reflectance. The Permian source rock in the area has reached a postmaturity stage. The precess of asphalt formation and evolution are discussed from the thermal evolution history of that source rock. Properties multistage formation of the asphalts are analyzed also.