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通过对焉耆盆地烃源岩的生烃史、油气成熟度、流体包裹体均一温度和储集层自生伊利石同位素年代学的研究 ,综合分析盆地的成藏期次。焉耆盆地八道湾组烃源岩的两次主要生、排烃作用发生在侏罗纪末期和早第三纪 ,白垩纪为生烃停止期 ;三工河组砂岩溶蚀孔隙中的流体包裹体形成温度主要为 10 1～ 13 0℃ ,与侏罗纪晚期三工河组储集层温度相当 ,表明这些包裹体主要是侏罗纪晚期以压溶和溶蚀作用为主的晚成岩作用阶段形成的。储集层自生伊利石的K/Ar同位素年龄分布主要为 170～ 14 0Ma和 12 0～ 10 0Ma ,第一期反映侏罗纪晚期的成藏作用 ,第二期与白垩纪油气藏的破坏作用有关。三工河组原油、八道湾组原油的αααC2 9甾烷 2 0S/ (2 0S + 2 0R)比值平均为 0 .49和 0 .45 ,C2 9甾烷 ββ/ (αα + ββ)比值平均为 0 .46和 0 .40 ,表明原油生成和成藏时烃源岩的Ro 值约为 0 .7%～ 1.0 % ,与生烃凹陷八道湾组烃源岩在侏罗纪末的成熟度相当 ;天然气甲烷碳同位素值为 -5 1.80‰～ -4 1.5 3‰ ,成熟度比原油更低 ,形成时间更早。综合分析认为 ,焉耆盆地曾发生两期成藏作用 ,第一期是侏罗系埋深最大的侏罗纪晚期 ,为主要成藏期 ;第二期是侏罗系二次埋藏的第三纪。图 4参 6
Based on the research on hydrocarbon generation history, oil and gas maturity, homogenization temperature of fluid inclusions and authigenic illite isotopic chronology in Yanqi Basin, the hydrocarbon accumulation stages of the basin are comprehensively analyzed. The two major hydrocarbon generation and expulsion processes in the Badaowan Formation source rocks in the Yanqi Basin occurred in the late Jurassic and early Tertiary and the Cretaceous was the hydrocarbon generation stop period. The temperature of fluid inclusions in the sandstone dissolution pores of the Sangonghe Formation was mainly Which is similar to that of the Late Jurassic Sankonghe Formation, indicating that these inclusions were mainly formed in late-diagenetic stages dominated by depressive dissolution and dissolution during the Late Jurassic. The K / Ar isotopic age distribution of authigenic illites in reservoirs is mainly 170 ~ 140Ma and 120 ~ 100Ma. The first phase reflects the accumulation of Late Jurassic and the second is the destruction of Cretaceous reservoirs related. The average ratio of 0 0S / (2 0S + 2 0R) of αααC 2 9 steranes in the crude oil of the Sangonghe Formation and the Badaowan Formation was 0.49 and 0.45, and the average ratio of C2 9 steranes ββ / (αα + ββ) was 0.46 and 0.40, indicating that the Ro value of source rocks during the formation and accumulation of crude oil is about 0.7% ~ 1.0%, which is similar to that at the end of Jurassic in the source rocks of the Badaowan Formation in the hydrocarbon-generating depression ; Natural gas methane carbon isotope value of -5 1.80 ‰ ~ -4 1.5 3 ‰, maturity lower than the crude oil, the formation of earlier. According to the comprehensive analysis, two periods of reservoir forming have occurred in the Yanqi Basin. The first stage is the Jurassic late Jurassic buried stage, which is the main accumulation period. The second stage is the Jurassic second-buried Tertiary . Figure 4 reference 6