Hydrocarbon migration and exploration potential in the unconformities at the top of the Middle-Lower Ordovician in the central uplift belt,the Tarim Basin

Zhou Bo; Wang Yi; Luo Xiaorong; Yun Jinbiao; Zheng Menglin

doi:10.11743/ogg20070613

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Hydrocarbon migration and exploration potential in the unconformities at the top of the Middle-Lower Ordovician in the central uplift belt,the Tarim Basin
Vol. 28, Issue 6, Pages: 791-796(2007)
Online First：25 December 2007，

Published：2007
DOI： 10.11743/ogg20070613
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DOI：

Zhou Bo, Wang Yi, Luo Xiaorong, et al. Hydrocarbon migration and exploration potential in the unconformities at the top of the Middle-Lower Ordovician in the central uplift belt,the Tarim Basin[J]. 2007, 28(6): 791-796. DOI： 10.11743/ogg20070613.

摘要

将塔里木盆地中央隆起区中-下奥陶统顶不整合面作为目标层系

选择对该层有油气贡献的中-下寒武统烃源岩和中-下奥陶统烃源岩

针对两套烃源岩分别建立运移模式。其中

中-下寒武统烃源岩距离中-下奥陶统顶不整合面的垂向距离较远

运移模式以垂向为主

且主要是沿着断裂分布;而针对中-下奥陶统烃源岩则应用侵入逾渗理论模型来模拟其对中-下奥陶统顶不整合面的贡献

分析表明中-下奥陶统烃源岩对中-下奥陶统顶不整合面的油气贡献以侧向运移为主。最后

综合两套烃源岩的油气贡献分析认为塔中地区为最好的油气潜力区。

Abstract

Taking the top of the Middle-Lower Ordovician unconformity as the target

the source rocks in the Middle-Lower Cambrian and the Middle-Lower Ordovician were selected for their oil and gas contributions to establish hydrocarbon migration patterns.As the Middle-Lower Cambrian source rock is far from the top of the Middle-Lower Ordovician unconformity vertically

most of the hydrocarbons migrated vertically and distributed along the faults.While for the Middle-Lower Ordovician source rock

the invasion-percolation theoretical model was applied to characterize its contribution to the top of the Middle-Lower Ordovician unconformity and revealed that the hydrocarbon migration there is mainly lateral.Based on a comprehensive analysis of contributions of these two sets of source rocks

the Tazhong area is considered to be a favorable area for the hydrocarbon exploration.