| 鄂尔多斯盆地地层埋藏演化与油气成藏分析 |
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| 作者姓名： | 吴保祥 何金先 张晓丽 徐丽 夏嘉 段毅 |
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| 作者单位： | 中国科学院地质与地球物理研究所石油资源研究重点实验室 |
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| 基金项目： | 国家基础研究发展规划“973”项目(2012CB214701-05);中国科学院战略性先导科技专项(XDB03020400) |
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| 摘 要： | 地层埋藏状况对有机质生烃及油藏保存具有重要的控制作用.通过对鄂尔多斯盆地晚三叠世以来地层埋藏史和有机质热演化生烃史的恢复,对比盆地不同地区之间地层剥蚀和埋藏特点,探讨地层埋藏演化特征对油气成藏的影响,分析地层埋藏对有机质生烃及油藏保存条件的影响.结果表明:在鄂尔多斯盆地晚三叠世以来经历的4期(T3、J1、J2、K1)沉降—抬升循环演化过程中,不同地区的沉积埋藏深度和埋藏速率存在明显差异.一方面导致各地区间长7烃源岩进入生烃的时间提前或滞后.北部古峰庄地区和中部白豹地区在J2期已进入早期生烃,姬塬和镇北地区在J3期进入早期生烃,而南部西峰、洛川地区和东部陕北地区早期生烃的时间是K1早中期.进入大量生烃阶段的时间基本都在K1期.另一方面导致地区间成藏封存条件的变化.在北部和中南部地区,地层埋藏深度大,沉积速率高,形成很好的封闭条件.各生烃阶段,特别是早期生成油气也可很好地保存而成藏.
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| 关 键 词： | 鄂尔多斯盆地 地层埋藏史 热演化史 生烃时间 成藏保存条件 |
Analysis of burial evolution of stratum and oil-gas reservoirs formation in Ordos basin |
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| Authors: | WU Bao-xiang HE Jin-xian ZHANG Xiao-li XU Li XIA Jia DUAN Yi |
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| Institution: | (Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China) |
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| Abstract: | Burial conditions of stratigraphy in Petroliferous basins play an important role in the control of hydrocarbon generation and reservoir storage.In this paper,strata burial history and thermal evolution history of hydrocarbon generation in Ordos basin are recovered since later Triassic,and the characteristics of burry and erosion of stratigraphy among are contrasted.We also discuss the impact of the stratigraphic burial characteristics on hydrocarbon accumulation effect.The results show that the depths of burial and burial rate are significantly different among different regions of Ordos basin during four evolution stages of subsidence-uplift(T3,J1,J2,K1).On the one hand,times of hydrocarbon generated from later Triassic Chang-7 Section source rocks in these regions were delayed or advanced due to the difference in stratigraphic burial conditions.It entered into the early hydrocarbon generation during Middle Jurassic(J2) in Gufengzhuang and Baibao area of northern-mid Ordos basin,during Later Jurassic(J3) in Jiyuan,Zhenbei areas of mid,and during early Cretaceous(K1) in Gufengzhuang,Shanbei and Luochuan areas of Ordos basin.The time of large amount stage of hydrocarbon generation all is early Cretaceous(K1) throughout Ordos basin.On the other hand,differences in strata burial lead to changes of closed conditions for reservoir formation in these areas of Ordos basin.Larger depth of stratigraphic burial and higher deposition rate are favorable to the formation of good closed conditions in the northern and south-central Ordos basin,where even early oil and gas generation have been well preserved. |
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| Keywords: | Ordos basin burial history of strata thermal evolutionary history time of hydrocarbon generation closed conditions of oil-gas reservoir |
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