塔中隆起区中-下奥陶统顶不整合面油气运移分析和勘探潜力评价

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

周波 王毅 罗晓容 云金表 郑孟林

Zhou Bo Wang Yi Luo Xiaorong Yun Jinbiao Zheng Menglin

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。

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.

10.11743/ogg20070613