【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。更多还原

【Abstract】 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.更多还原