下刚果盆地北部碳酸盐岩层序地层分析
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摘要
以层序地层学理论为基础,利用地震及钻井资料,对西非刚果(布)海上下刚果盆地北部海域白垩系Lower Sendji组海相碳酸盐岩层系进行层序地层与沉积储层精细研究。研究认为,Lower Sendji组时期,研究区发育浅海碳酸盐岩缓坡台地混合沉积体系,该体系以颗粒灰岩的颗粒滩微相沉积为主。自下向上将Lower Sendji组划分为SQ1～SQ4共4个三级层序。下伏盐岩与碳酸盐岩盐筏块体发生重力滑动,造成局部地势微弱起伏,同时控制其上碳酸盐岩储层的发育和展布。
The sequence stratigraphy and sedimentary reservoirs in the marine carbonate rocks of Cretaceous lower Sendji formation,the north of offshore Lower Congo Basin,Congo(Brazzaville),West Africa,have been studied by using seismic and drilling data.The study shows that shallow offshore carbonate ramp platform sedimentation system had developed in the lower Sendji formation and was dominated by grainstone of grain bank microfacies.Four third-order sequences are divided from below for the lower Sendji formation,namely SQ1～SQ4.Gravity sliding in the underlying salt rock and carbonate salt raft had led to slight relief locally,meanwhile controlled the development and distribution of overlying carbonate reservoirs.
The sequence stratigraphy and sedimentary reservoirs in the marine carbonate rocks of Cretaceous lower Sendji formation,the north of offshore Lower Congo Basin,Congo(Brazzaville),West Africa,have been studied by using seismic and drilling data.The study shows that shallow offshore carbonate ramp platform sedimentation system had developed in the lower Sendji formation and was dominated by grainstone of grain bank microfacies.Four third-order sequences are divided from below for the lower Sendji formation,namely SQ1～SQ4.Gravity sliding in the underlying salt rock and carbonate salt raft had led to slight relief locally,meanwhile controlled the development and distribution of overlying carbonate reservoirs.
引文
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[9]邵龙义,陈家良,李瑞军,等.广西合山晚二叠世碳酸盐岩型煤系层序地层分析[J].沉积学报,2003,21(3):168-174.
[2]邓荣敬,邓运华,于水,等.西非海岸盆地群油气勘探成果及勘探潜力分析[J].海洋石油,2008,28(3):11-19.
[3]白云程,周晓惠,万群,等.世界深水油气勘探现状及面临的挑战[J].特种油气藏,2008,15(2):7-10.
[4]马永生译.碳酸盐岩微相——分析、解释及应用[M].北京:地质出版社,2006:628-695.
[5]姚根顺,沈安江,潘文庆,等.碳酸盐岩储层——层序地层格架中的成岩作用和孔隙演化[M].北京:石油工业出版社,2008:35-40.
[6]马永生,刘波,梅冥相,等译.碳酸盐岩层序地层学——近期进展及应用[M].北京:海洋出版社,2003:1-36.
[7]姜在兴,向树安,陈秀艳,等.淀南地区古近系沙河街组层序地层模式[J].沉积学报,2009,27(5):931-938.
[8]蔡希源,李思田,郑和荣,等.碳酸盐岩储层和沉积体系的地震成像[M].北京:地质出版社,2007:87-90.
[9]邵龙义,陈家良,李瑞军,等.广西合山晚二叠世碳酸盐岩型煤系层序地层分析[J].沉积学报,2003,21(3):168-174.
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