【摘要】 为推进我国石油工业发展丰富石油地质理论 ,根据野外露头及室内分析化验资料 ,建立 8种相标志 ,识别出索瓦期沉积相类型有 :台地相、台地边缘相、盆地相和海陆过渡相、湖泊相。受北部拉竹龙 金沙江缝合带、中央隆起带和南部班公湖 怒江缝合带的影响 ,沉积相呈近东西向展布 ,具南北分带的特点。文章分析了索瓦期的沉积特征 ,总结了该期的沉积模式。根据研究区的生物特征和沉积特征 ,推断当时气候是温暖、半干旱的。综合分析认为 ,索瓦组是羌塘盆地很有潜力的油气勘探目的层 ,其与上覆雪山组地层可构成有利的含油气组合 ;而双湖 多涌地区是首选的含油气有利区带。更多还原

【Abstract】 The second largest scale transgression in the Mesozoic occured during the Suowa Stage in the Qiangtang Basin in the Qinghai-Tibet Plateau after the Buqu Stage. The transgression is in a northward direction. The whole basin was mainly filled with carbonate rocks. Field outcrops and indoor data analysis revealed 8 kinds of sedimentary facies marks fit for this region; and then 5 types of sedimentary facies were recognized: platform facies, platform marginal facies, basin facies, transitional facies and lake facies. Influenced by the northern Lazhulong-Jinshajiang suture zone, Central uplift region and the southern Bangonghu-Nujiang suture zone, facies belts extend east to the west. The depositional model was established based on observed deposition features. According to biologic features and sedimentary characteristics, it is deduced that the weather was warm and semi-arid during the Suowa Stage. Shuanghu-Duoyong district formed a set of good Source-reservoir-cap assemblage of oil and gas, and can be the most promising target for oil and gas exploration in the future.更多还原