东非鲁伍马盆地深水浊积砂岩气藏成藏条件及控制因素

作    者:曹全斌1, 唐鹏程1, 吕福亮1, 范国章1, 邵大力1, 鲁银涛1, 许小勇1, 陈宇航2
单    位:1 中国石油杭州地质研究院; 2 西安石油大学地球科学与工程学院
基金项目:受国家科技重大专项“南海中建海域深水油气地质条件及目标评价”等联合资助
摘    要:
利用研究区最新的地震和钻井等基础资料,对东非鲁伍马盆地已发现气藏的成藏条件及成藏控制因素进行了分析研究。结果表明,鲁伍马盆地具有良好的油气成藏条件,研究区内烃源岩为裂谷期发育的二叠系—三叠系、侏罗系和白垩系的泥页岩,储层为古近系浊积砂岩,盖层为古近系发育的几套分布广泛的海相泥岩。分析认为构造活动控制了研究区的油气成藏,良好的盖层条件是油气成藏和保存的关键因素。指出构造相对稳定区,特别是受晚期伸展构造影响较弱的陆坡区是优先勘探的方向,区块优选应尽量避开通天断裂发育的区域,同时需要重点对区域盖层条件进行评价。
关键词:东非;鲁伍马盆地;深水;浊积砂岩;气藏;成藏条件

Formation conditions and controlling factors of gas-bearing turbidite sand reservoirs in deep water deposits in the Rovuma Basin, East Africa

Author's Name: CAO Quanbin, TANG Pengcheng, Lü Fuliang, FAN Guozhang, SHAO Dali, LU Yintao, XU Xiaoyong, CHEN Yuhang
Institution: PetroChina Hangzhou Research Institute of Geology,
Abstract:
Based on the latest seismic and drilling data, the formation conditions of gas reservoir and the controlling factors of gas accumulation of the Rovuma Basin in East Africa have been analyzed. The results show that the Rovuma Basin has excellent conditions for hydrocarbon accumulation. In the study area, the source rock is mud shale of Permian-Triassic, Jurassic and Cretaceous which developed in the rift period, and the reservoir is the Paleogene turbidite sand, and the regional caprock has several sets of the marine mudstone widely distributed in Paleogene. It is concluded that the tectonic activities controlled the oil and gas accumulation in this area, and good caprock conditions are the key factor for hydrocarbon accumulation and preservation. It is pointed out that the relatively stable area, especially the continental slope area with weak tectonic deformation during the latest extensional deformation is a priority exploration region, and the optimal selection of exploration block should avoid the area with large scale faults that extend to sea floor, and the regional caprock conditions should be evaluated emphatically.
Keywords: deep water; turbidite sand; gas reservoir; accumulation conditions; Rovuma Basin; East Africa
投稿时间: 2017-11-28  
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