摩洛哥—西撒哈拉被动陆缘盆地 石油地质特征及勘探方向

作    者：马宏霞，刘艳红，张颖，丁梁波，王红平，左国平，张勇刚，吴佳男
单    位：中国石油杭州地质研究院
基金项目：
摘    要：
针对摩洛哥—西撒哈拉具有相似构造和沉积特征的被动陆缘盆地，开展盆地演化、石油地质特征与资源潜 力等方面的研究，并指出油气勘探方向。摩洛哥—西撒哈拉被动陆缘盆地经历前裂谷期、裂谷期和后裂谷期3期构 造演化，发育多套烃源岩和储层、多种圈闭类型。最重要的烃源岩为后裂谷期侏罗系—白垩系海相泥岩，主要储层为 侏罗系—白垩系碳酸盐岩和碎屑岩，圈闭类型以盐构造作用机制下形成的构造圈闭和构造-岩性圈闭为主。摩洛 哥—西撒哈拉被动陆缘盆地可划分为3个主要成藏组合，侏罗系和白垩系—新近系成藏组合是最重要的成藏组合。 侏罗系碳酸盐岩和白垩系阿尔布阶—塞诺曼阶浊积砂岩是研究区当前的重点勘探领域；深水区白垩系盐构造和斜坡 扇形成的地层-岩性圈闭可能为未来的勘探潜力区。
关键词：被动陆缘盆地；油气地质条件；成藏组合；资源潜力；摩洛哥；西撒哈拉

Petroleum geological characteristics and exploration direction in Morocco-Western Sahara passive continental margin basins

Author's Name: MA Hongxia, LIU Yanhong, ZHANG Ying, DING Liangbo, WANG Hongping， ZUO Guoping, ZHANG Yonggang, WU Jianan
Institution: 
Abstract:
Focusing on the passive continental margin basins with similar structural and sedimentary characteristics in Morocco and Western Sahara offshore areas, this paper conduct research on basin evolution, petroleum geological characteristics, and resource potential, and point out the direction of oil and gas exploration. Morocco-Western Sahara passive continental margin basins are composed of Aaium Tarfaya Basin, Souss Trough, Essaouira Basin and Doukkala Basin. These basins experienced three stages of tectonic evolution, including pre-rift stage, rift stage and post-rift subsidence stage. The pre-rift stage is characterized by the passive continental margin evolution from Cambrian to Early Carboniferous and uplift from Late Carboniferous to Permian. Rifting commenced in Triassic and continued to Early Jurassic. The Triassic and Lower Jurassic terrestrial-marginal marine strata are separated from Paleozoic strata by the Hercynian unconformity. The post-rift stage prevailed from Middle Jurassic to present day, which can be divided into thermal subsidence period of Middle Jurassic to Cretaceous and uplift period of Paleogene to Neogene . Multiple sets of source rocks, reservoirs and a variety of trap types are developed due to the basin structural evolution and sea level change. The most important source rock is post-rift Jurassic-Cretaceous marine mudstone, and the main reservoir is Jurassic-Cretaceous carbonate rock and clastic rock reservoirs. The trap types are mainly structural traps and structurallithologic traps formed under the salt tectonics mechanism. Three main reservoir forming assemblages are divided in the Moroccan -Western Sahara passive continental margin basins, with the Jurassic and Cretaceous-Neogene reservoir forming assemblages being the most important. Jurassic carbonate rock and Cretaceous Albian-Cenomanian turbidite sandstone are the current key exploration fields in this area. Stratigraphic lithologic traps formed by Cretaceous salt tectonics and slope fan in deep water area may be the future exploration potential area.
Keywords: passive continental margin basins; petroleum geological conditions; reservoir forming assemblages; resource potential; Morocco; Western Sahara
投稿时间： 2023-07-07  
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