STUDY ON THE PETROLEUM RESOURCE POTENTIAL IN THE QIANGTANG BASIN, QINGHAI-TIBET PLATEAU
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摘要: 通过青藏高原羌塘盆地烃源层评价、富烃源岩沉积环境及有机相、热演化、生烃史研究和生油气量估算、综合评价排序,结合地质条件综合研究,认为羌塘盆地中部(特别是南、北羌塘坳陷的中部)侏罗系布曲组(J2b)—夏里组(J2x)生储盖组合是大中型轻质油气田或凝析气田勘探最有利的地区和目的层,其泥页岩类和灰岩类有机质丰度相对高,发育有好—很好烃源岩,以红藻有机相和混源有机相为主,多正处于成熟中晚期阶段,具有二次生烃过程,生烃强度高,总生烃量和轻质油气量大。羌塘盆地中部(特别是北羌塘坳陷中部)三叠系肖茶卡组及中下侏罗统的生储盖组合是大型或特大型气田最有利的勘探地区,其泥页岩有机质丰度高,发育有好—很好烃源岩,以红藻有机相和混源有机相为主,已经处于过成熟阶段,生烃强度很高,总生气量巨大。Abstract: Combining researches on the hydrocarbon source rock sedimentary environment,organic facies,organic matter's maturation and hydrocarbon-generating history with the geologic conditions in the Qiangtang Basin,Qinghai-Tibet Plateau,it is considered that the Jurassic J2b-J2x play in the central Qiangtang Basin,especially in the central parts of the South and North Qiangtang Depression is the most favorable target for exploration of the large and middle light oil/gas field or condensate field.In this Jurassic J2b-J2x play,the abundance of organic matters in mud shale and limerock is relatively high,good hydrocarbon source rock develops,red algae organic facies and mixed organic facies are dominant,most of the hydrocarbon source rocks are hige-mature to over-mature,there are two hydrocarbon-generating processes,the quantities of hydrocarbons and lihgt oil/gas is large.The Triassic T3x play in the center of Qiangtang Basin,especially in the center of the North Qiangtang Depression is the most favorable target for exploration of the large or super-large gas field.In this Triassic T3x play,the abundance of organic matters in mud shale is high,good hydrocarbon source rock developed,red algae organic facies and mixed organic facies are dominant,hydrocarbon source rocks are over-mature,the total hydrocarbon-generating quantity is great.
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