陆相盆地层序地层学分析的方法与实践

针对中国陆相含油气盆地的地质特征，提出了层序地层学油气勘探方法。从露头，井剖面及地震层序分析入手，以沉积层序与生储盖的形成，演化及分布为主线，探讨油气藏的分布规律，寻找油气勘探有利区带。以渤海湾盆地和吐哈盆为实例，对湖泊环境，沼泽环境和河流环境中的层序地层学应用进行了分析探讨。

THE METHOD AND PRACTICE OF SEQUENCE STRATIGRAPHIC ANALYSIS IN THE NONMARINE BASINS

The sequence stratigraphic method for petroleum exploration was proposed according to geologic features of nonmarine basinsin China. This method emphasizes the analysis of formation, evolution and distribution of depositional sequence and sourcerocks, reservoirs and seals; understanding of distribution of oil pools in order to discover oil and gas fields on the basis ofoutcrop observation; well profile and seismic sequence analysis. Taking Bohai Bay basin and Turpan-Hami basin as examples,this paper studies the sequence stratigraphic application in lacustrine, limnetic and nuvial environments, and points out thatthe condensed sections in lacustrine environment are important source rocks, transgressive and regressive system tracts canform important reservoirs, and development of seals mainly depends on the types of depositional systems. In the limneticenvironment, except for lacustrine mudstones of condensed sections, the hydrogenous coals developed on the environment ofopen water swamp or phragmites peat also are important source rocks.