【摘要】 三湖凹陷为北陡南缓,北斜坡由于凹陷急剧沉降与边缘相对抬升形成多个挠曲褶皱带,坳陷内可形成2大类岩性生物气藏,即陡坡带岩性气藏和缓坡带岩性气藏。指出多旋回的构造运动,多期湖平面升降,为多类型岩性圈闭的形成奠定了物质基础;生物气的长期生成为成藏提供了丰富的气源;砂层良好的孔渗条件及大面积分布为成藏提供了运移汇聚条件。认为三湖坳陷岩性生物气藏具有巨大的勘探前景。更多还原

【Abstract】 There is the commercial exploration perspective of lithologic biogas pool in the Sanhu depression of the Chaidamu basin, NW, China. The multicyclic tectonic movement, multiperiodic raising and falling of lake watertable have provided the basis of materials for the forming of each kind of lithologic gas pool. Biogaseous generation has supplied plentiful gaseous source for a long time. The larger-area distribution of sandstone layers with good porosity has provided the migratory concentration condition. The northern part of the Sanhu depression is steep, and yet the sently dipping is formed in the south. Owing to the depression has rapidly been subsided as well as the margin has relatively been uplifted many flexural fold bandes have been formed in the northern clinothem. Lithologic biogaseous pools are calsified to two main types that contain abrupt slope and gentle slope belts.更多还原