Gabon Basin Salt Characters and Its Influences on Pre-salt Oil and Gas Exploration
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摘要: 加蓬盆地是一个典型的被动大陆边缘含盐盆地，以下白垩统盐岩为界分为盐上、盐下两个勘探领域。近年来随着巴西深水盐下陆续获得多个世界级油气田发现，以加蓬、宽扎为代表的西非盐下也逐渐成为世界油气勘探的热点。如何落实盐下圈闭是制约盐下油气勘探的首要难题。从盐岩岩性组合、岩石物理特征入手，分析了加蓬盐岩特征及其对盐下地震成像及构造落实的影响。同时，针对加蓬深水这一热点区域勘探程度低、烃源岩、储层等基本石油地质条件不清的特点，利用盆地模拟手段，分析了加蓬深水区盐下烃源岩的热成熟度及盐岩对盐下烃源岩热演化的影响;结合新钻井资料，分析了盐岩对盐下储层物性的影响，指出加蓬深水区盐下储层具有较好物性;分析了盐岩平面分布特征，从盖层角度指出了盐下油气勘探最有利的区带。对其他含盐盆地盐下油气勘探具有一定借鉴意义。Abstract: Gabon Basin is a typical Atlantic passive margin salt basin, which is subdivided into pre-salt sequence and post-salt sequence by Aptian salt. Inspired by several giant pre-salt discoveries, such as Tupi, Franco, Libra in Brazil deep water, West Africa salt basins such as Gabon, Kwanza have attracted eyes from world major players in recent years. In order to solve pre-salt trap identification difficulties, we analyzed the lithological and petrophysical characters of Gabon salt and its influences on pre-salt imaging and seismic interpretation. Meanwhile, pre-salt in deep water Gabon is less-explored and thus pre-salt source and reservoirs characteristics are not clear. Considering heat conductivity, density and ductility character of salt, we analyzed pre-salt source rock maturity in Gabon deep water and salt influences on pre-salt source rock maturity based on basin modeling; we analyzed salt influences on pre-salt reservoir quality and pointed out deep water Gabon developed high quality pre-salt reservoirs by using new well data; we analyzed salt distribution, deformation and its influences on hydrocarbon charge and preservation, and pointed out that favorable pre-salt exploration areas and favorable areas for post-salt accumulations from pre-salt source. This paper may have some inspiration for other salt basin exploration.
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Keywords:
- Gabon Basin /
- pre-salt trap identification /
- source rock /
- reservoir /
- favorable exploration belt
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[1] 马君,刘剑平,潘校华,等. 西非被动大陆边缘构造演化特征及动力学背景[J].中国石油勘探,2008(3):60-64. [2] Mounguengui M, Lang J, Guiraud M, et al. Sedimentary dynamics and structural geology of pre-rift deposits of the interior basin of Gabon[J]. Journal of African Earth Sciences, 2002,35:315-329. [3] Teisserenc P, Villemin J. Sedimentary basin of Gabon-geology and oil Systems[M]//Edwards J D, Santogrossi P A. Divergent/Passive Margin Basin, Tulsa: AAPG, 1989:177-199. [4] Edwards J D, Santogrossi P A.离散或被动大陆边缘盆地[M]. 梁绍全, 梁红, 张绍海译. AAPG论文集,2000,121-127. [5] 刘东周,窦立荣, 郝银全,等.滨里海盆地东部盐下成藏主控因素及勘探思路[J]. 海相油气地质,2004, 19(1): 53-58. [6] 王东旭,曾溅辉, 宫秀梅,等.膏盐岩层对油气成藏的影响[J]. 天然气地球科学,2005, 16(3):329-333. [7] 赵振宇,周瑶琪, 马晓鸣,等. 含油气盆地中膏盐岩层对油气成藏的重要影响[J]. 石油与天然气地质,2007, 28(2):299-308. [8] 梁杰,龚建明,成海燕. 墨西哥湾盐岩分布非油气成藏的控制作用响[J]. 海洋地质动态,2006, 26(1):25-29.
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