鄂尔多斯盆地陇东地区长7段有效烃源岩及生排烃研究

发布时间：2018-02-24 14:37

  本文关键词： 有效烃源岩 热演化 排烃强度 延长组 三叠系 陇东地区 鄂尔多斯盆地　出处：《石油实验地质》2017年01期 　论文类型：期刊论文

【摘要】：通过烃源岩地球化学数据分析、测井有机碳计算、生烃潜力法及生排烃史模拟,研究了鄂尔多斯盆地陇东地区长7段有效烃源岩的分布、生排烃史及排烃强度。长7段有机碳含量大于1.0%的暗色泥岩(含油页岩)厚度主要为20~90 m,平均有机碳含量主要介于2%~9%,其有效烃源岩分布以w(TOC)=1.0%和Ro=0.7%为界限,具有大面积广覆式分布的特征;长7段有效烃源岩在侏罗纪末期开始成熟生烃,主要在早白垩世早期(140~130 Ma,Ro≈0.7%)开始排烃,至早白垩世末期(100 Ma)达到生排烃高峰(Ro≈1.0%),最大产油率接近400 mg/g,排油率达308 mg/g,晚白垩世以来的区域性构造抬升使得生烃停止;长7段有效烃源岩排烃强度主要分布于(10~250)×104t/km~2,具有强排烃特征,以长6—长8段致密油为主的延长组油藏主要分布于排烃强度大于20×10~4t/km~2的地区,油气具有近源短距离富集的特点。
[Abstract]:Based on the geochemical data analysis of source rocks, well logging organic carbon calculation, hydrocarbon generation potential method and hydrocarbon generation and expulsion history simulation, the distribution of effective source rocks in Chang7 member of Longdong region, Ordos Basin, is studied. Hydrocarbon generation and expulsion history and hydrocarbon expulsion intensity. The thickness of dark mudstone (oil shale) with organic carbon content greater than 1.0% in Chang 7 is mainly 20 ~ 90 m, and the average organic carbon content is mainly between 2 ~ 9%. The effective source rocks are distributed in the range of 1.0% and 0.7% of the available hydrocarbon source rocks. The source rocks of the Chang 7 member began to mature in late Jurassic, mainly in the early Cretaceous (140 ~ 130 Ma Ro 鈮，

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