我国中西部前陆盆地的特殊性和多样性及其天然气勘探

通过对我国中西部前陆盆地构造特征、大地构造背景、地球物理特征的理论研究和典型前陆盆地的详细解析，系统分析了我国中西部前陆盆地的发育特征和特殊性。强调晚二叠世以来大小不一、形态各异的多块体小型克拉通的聚合碰撞作用是导致中西部前陆盆地群形成的基本动力学过程：这些小型克拉通的多块体聚合碰撞造就了中西部前陆盆地的特殊性和多样性。同时，明确提出中西部盆地的基本特点是“两期三类前陆盆地”，即海西一印支期前陆盆地和喜山期前陆盆地，三类指海西一印支期的周缘前陆盆地和弧后前陆盆地、喜山期再生前陆盆地。根据前陆盆地的盆地结构和演化特征，又将中西部的前陆盆地划分为4种组合形式，即叠合型组合、改造型组合、早衰型组合和新生型组合。综合论述了不同时期不同类型前陆盆地构造对天然气聚集的五大控制作用。

Particularity and Diversity of the Foreland Basins in the Central and Western China and the Natural Gas Exploration in the Foreland Basins

This paper systematically summarizes the evolution features and distinctiveness of the foreland basins in the central and western China through the all-around analysis of the structural characters, tectonic settings, and geophysical data of the typical foreland basins. It is pointed out that the aggregation and collision of the numerous diverse micro-cratons is the dynamic genesis of the foreland basin group in the central and western China, which also caused the diversity and particularity of these foreland basins. These foreland basins comprise the Hercynian-Indosinian foreland basins and the Himalayan rejuvenated foreland basins, which can also be subdivided into three types: the Hercynian-Indosinian peripheral foreland basins, the Hercynian-Indosinian back-arc foreland basins and the Himalayan rejuvenated foreland basins. According to the basin construction and evolution, these foreland basins can be grouped into four assemblages: the superimposed, the reconstructed, the presenile and the regenerated. In the end, this paper presents five dominant effects to the migration and congregation of oil and gas in the foreland basins of different types.