北部湾盆地涠西南凹陷流沙港组烃源岩生烃潜力评价
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摘要
涠西南凹陷主力烃源岩流沙港二段沉积时期,盆地处于欠补偿环境,其主要沉积物是中深湖相的暗色泥岩,地震上以亚平行、中—弱振幅、不连续的反射特征为主;流沙港组二段泥岩有机碳质量分数普遍大于1.5%,干酪根类型主要为Ⅰ和Ⅱ型,为优质生油岩。通过盆地模拟,得出涠西南凹陷流沙港组源岩生油量为114×108t,生气量为22.31×1011m3,累计生烃强度基本上大于5×106t/km2;平面上A洼生烃占41%,B洼生烃占54%,纵向上流沙港组二段生烃约占流沙港组生烃量的80%,为主要烃源贡献者;涠西南凹陷存在2期生油高峰期:涠洲组沉积时期及下洋—现今沉积时期。在综合考虑油气运聚单元划分结果、骨架砂体及断层展布与发育特征的基础上,指出了涠西南凹陷有利的油气运聚区。
The second member of Liushagang Formation was the principal layer of source rocks,in this area the lake remained as a starved basin; the characteristics of seismic reflection were largely parallel,sub-weak amplitude,discontinuous emission characteristics. TOC was generally greater than 1. 5%; the kerogen type major was Ⅰ and Ⅱ type; it might be good source rocks. According to the result of the simulation,Weixinan sag in Liushagang Formation,source rock oil yield was 11. 4 billion tons,gas yield was 22. 31 hundred billion m3,total hydrocarbon generating intensity basically exceeded 5 million tons/km2; in plane,depression A hydrocarbon was accounted for 41%,the depression B was accounted for 54% of the hydrocarbon generation. Vertically,the hydrocarbon generation amount for the second member of Liushagang Formation run up to 80%,the main source contributor. In Weixinan sag,there were two hydrocarbon generation peaks: the depositional period of Weizhou Formation and the period of Xiayang to present depositional period. According to the oil and gas migration and accumulation unit classification results,and development characteristics of sand body framework and fault distribution,the authors might obtain the most favorable hydrocarbon accumulation zone.
The second member of Liushagang Formation was the principal layer of source rocks,in this area the lake remained as a starved basin; the characteristics of seismic reflection were largely parallel,sub-weak amplitude,discontinuous emission characteristics. TOC was generally greater than 1. 5%; the kerogen type major was Ⅰ and Ⅱ type; it might be good source rocks. According to the result of the simulation,Weixinan sag in Liushagang Formation,source rock oil yield was 11. 4 billion tons,gas yield was 22. 31 hundred billion m3,total hydrocarbon generating intensity basically exceeded 5 million tons/km2; in plane,depression A hydrocarbon was accounted for 41%,the depression B was accounted for 54% of the hydrocarbon generation. Vertically,the hydrocarbon generation amount for the second member of Liushagang Formation run up to 80%,the main source contributor. In Weixinan sag,there were two hydrocarbon generation peaks: the depositional period of Weizhou Formation and the period of Xiayang to present depositional period. According to the oil and gas migration and accumulation unit classification results,and development characteristics of sand body framework and fault distribution,the authors might obtain the most favorable hydrocarbon accumulation zone.
引文
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符永磊,裴健翔.2007.北部湾盆地构造单元划分[R].广东湛江:中海石油(中国)有限公司湛江分公司.
龚再升,李思田,谢泰俊,等.1997.南海北部大陆边缘盆地分析与油气聚集[M].北京:科学出版社.
龚再升,李思田.2004.南海北部大陆边缘盆地油气成藏动力学研究[M].北京:科学出版社.
黄保家,黄合庭,吴国瑄,等.2012.北部湾盆地始新统湖相富有机质页岩特征及成因机制[J].石油学报,33(1):26-30.
李林,刘兵,李绪深,等.2010.多属性预测在涠西南凹陷烃源岩研究中的应用[J].地球物理学进展,25(5):1737-1743.
李雨梁,黄忠明.1990.南海北部大陆架(西)地热特征与热演化史[R].广东湛江:中海石油(中国)有限公司湛江分公司.
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