鱼卡地区油砂矿地质特征及其成矿模式

Geological Features and Mineralization Mode in Oil Sands of the Yuka Area

运用钻井资料、地球化学分析和地震解释等方法,对柴达木盆地鱼卡地区油砂矿地质特征及成矿模式进行系统研究。结果表明:鱼卡地区油源丰富、有机质丰度高、类型好、成熟度低;储层物性较好,属于中高孔、中渗储层;泥岩封盖能力强,形成下生上储、自生自储式的生储盖组合;圈闭形成期与主生烃期的匹配关系良好,断裂构造发育,具备形成大型油砂矿的有利条件。综合分析认为鱼卡地区为构造抬升型油砂成矿模式。研究可对柴达木盆地非常规油气勘探有一定的指导意义。

Drilling data,geochemical analysis and seismic interpretation methods were used to conduct systematic research on geological features and mineralization mode of oil sands in the Yuka Area,the Qaidam Basin. The Results show that the Yuka Area is featured by rich oil source,high abundance of organic matter,good type and low maturity. The physical properties of the reservoir was favorable,featured by medium- high porosity and medium permeability. The sealing capacity of mudstone was high,forming source- reservoir- caprock assemblage of lower generation,upper accumulation and self generation. The matching relationship between trap- forming period and major source generation period was good with fractures developed. There were favorable conditions for forming large- scale oil sands. Comprehensive analysis revealed that the Yuka Area was featured by uplifting structure for the mineralization of oil sands. Research is of instructive significance to unconventional oil and gas exploration in Qaidam Basin.