不同沉积体系域具有成因联系沉积体之间的脉络关系
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摘要
层序地层学理论和重力流形成机制是深水区隐蔽油气藏勘探的理论基础,根据三角洲前积形成的顶超点终止现象来识别陆架坡折带;依据重力流对下伏地层造成的切割识别深切谷;在下陆坡和盆底平缓区根据典型的丘状外形和异于围岩的特殊地震反射特征识别深水扇,并进行精细刻画;对具有成因联系的供源区富砂性、深切谷外部形态演化特征及充填物、深水扇地震属性特征进行分析,定性评价深水扇体的富砂性。研究认为深水扇体的富砂性与前一个三级层序高位期三角洲具有明显的成因联系,对于今后海洋深水区岩性油气藏的勘探具有重要的指导意义。
The theory of sequence stratigraphy and the mechanism of gravity flows are the theoretical bases for the exploration in deepwater subtle reservoirs.This paper identified and described the shelf slope break zones based on the end of the toplap points of the deltaic progradation,identified the deep-incised valleys based on the cutting of the underlying formations by gravity flows,and identified the deep-water fans in the lower continental slope and flat basin floor based on the special seismic reflection features of typical moundy configurations and differences from the surrounding rocks.The abundance of sands in the source areas,the morphological evolution and fillers of the incised valleys,and the seismic attributes of the deep-water fans were analyzed,and the abundance of sands of the deep-water fans was qualitatively evaluated.The study indicates that the abundance of sands of the deep-water fans is genetically related with the previous third-order sequence highstand delta,and is of guiding significance to the exploration of offshore deep lithologic reservoirs.
The theory of sequence stratigraphy and the mechanism of gravity flows are the theoretical bases for the exploration in deepwater subtle reservoirs.This paper identified and described the shelf slope break zones based on the end of the toplap points of the deltaic progradation,identified the deep-incised valleys based on the cutting of the underlying formations by gravity flows,and identified the deep-water fans in the lower continental slope and flat basin floor based on the special seismic reflection features of typical moundy configurations and differences from the surrounding rocks.The abundance of sands in the source areas,the morphological evolution and fillers of the incised valleys,and the seismic attributes of the deep-water fans were analyzed,and the abundance of sands of the deep-water fans was qualitatively evaluated.The study indicates that the abundance of sands of the deep-water fans is genetically related with the previous third-order sequence highstand delta,and is of guiding significance to the exploration of offshore deep lithologic reservoirs.
引文
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[8]庞雄,等.南海珠江深水扇系统的层序地层学研究[J].地学前缘,2007,14(1):220-228.
[9]刘忠保,龚文平,张春生,等.坡折带上深切谷的形成及发育沉积模拟试验研究[J].石油天然气学报,2006,28(6):32-34.
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[11]彭大钧,等.南海珠江深水扇系统的形成模式[J].石油学报,2007,28(5):7-11.
[2]韩小锋,陈世悦,等.深水沉积特征研究现状及展望[J].特种油气藏,2008,15(2):1-6.
[3]黄传炎,等.板桥凹陷断控重力流沉积特征及沉积模式[J].油气地质与采收率,2007,14(6):14-16.
[4]卢红霞,陈振林,李天义.构造坡折带隐蔽圈闭发育模式浅析[J].海洋石油,2009,29(1):42-46.
[5]王颖,王英民,赵志魁.松辽盆地南部泉头组四段—姚家组西部坡折带的成因及演化[J].石油勘探与开发,2005,32(3):33-36.
[6]刘传虎,王学忠.陆相箕状断陷缓坡带层序地层学研究与勘探实践[J].特种油气藏,2010,17(6):1-5.
[7]叶小明,尹太举.萨尔图油田北三西西块高分辨率层序地层研究[J].特种油气藏,2010,17(6):32-34.
[8]庞雄,等.南海珠江深水扇系统的层序地层学研究[J].地学前缘,2007,14(1):220-228.
[9]刘忠保,龚文平,张春生,等.坡折带上深切谷的形成及发育沉积模拟试验研究[J].石油天然气学报,2006,28(6):32-34.
[10]王冠民,姜在兴.关于深切谷研究的进展[J].石油大学学报,2000,24(1):117-121.
[11]彭大钧,等.南海珠江深水扇系统的形成模式[J].石油学报,2007,28(5):7-11.
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