Source And Accumulation Stages Of Paleogene-cretaceous Crude Oil In Kuqa Depression

In this paper,through the study of oil and gas geochemistry of crude oil samples in Kuqa Depression,we are committed to finding out the distribution law and source of oil and gas.At the same time,the fluid inclusion period,fluorescence and temperature measurement of Paleogene-Cretaceous core samples in Qiulitage structural belt are analyzed,and the hydrocarbon accumulation history of Paleogene-Cretaceous reservoir in Qiulitage structural belt,and the following understandings are obtained :1.According to the analysis of chromatography-mass spectrometry of crude oil,it is considered that the crude oil in Kuqa depression is the product of the mature stage of source rocks,and the source rocks are mainly aquatic organisms,which contain a certain amount of Jurassic higher plants and deposited in the reduction environment.The sedimentary environment of crude oil in Bozi 1 well,Qule 1 well,Dina 2 well,Yangta 1 well and Yangta 5 well is swamp facies,the sedimentary environments of the other Wells are mainly lacustrine,fluvial or delta facies.2.The oil-source correlation results show that the crude oil of Well Bozi 1 in Kelasu structural belt comes from Jurassic source rocks,and the crude oil of Well Dabei301 and Well Keshen 131 comes from Triassic source rocks.The crude oil from Well Qiule 1 and Well Dina 2 in Qiulitage structural belt is from Jurassic source rocks,and the crude oil from Well Zhongqiu 1 is from Triassic source rocks.The crude oil from Well Yangta 1 and Well Yangta 5 in the Yangtake fault zone is from Jurassic source rocks,and the crude oil from Well Yangta 10 is from Triassic source rocks.The crude oil in Yingmai 7 fault structural belt mainly comes from Triassic source rocks.The crude oil of Well Yudong 7 in the Kalayuergun fault structural belt,Well Hongqi 1 in the Hongqi fault structural belt,Well Yingmai 46 in the Yingmaili uplift and Well Yaha7 in the Yaha buried hill structural belt may be Jurassic Both source rocks and Triassic source rocks contribute.3.There are three stages of hydrocarbon inclusions in Qiulitage structural belt of Kuqa depression.The occurrence characteristics of the first stage of hydrocarbon inclusions are mainly quartz healing joints,supplemented by cuttings healing joints.The occurrence characteristics of the second stage of hydrocarbon inclusions are mainly quartz healing joints,supplemented by calcite cements.The occurrence characteristics of the third stage of hydrocarbon inclusions are mainly quartz healing joints,and only found in Dongqiu 5 well.The formation time of hydrocarbon inclusions in Well Jiamu 2and Well Qule 1 was mainly studied,and the results showed that the formation time of the first phase inclusions was within 10 Ma,and that of the second phase inclusions was within 5 Ma,both of which were in Neogene.