STUDY ON THE PETROLEUM RESOURCE POTENTIAL IN THE QIANGTANG BASIN, QINGHAI-TIBET PLATEAU

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.