紫荆关-武陵断裂带以东的我国大陆及广大海域,属中国大陆板块东部陆缘扩张区,是中、新生代以来构造变动非常活跃的大陆边缘。它有规律地分布着五种不同类型的大陆边缘扩张沉降带。由于所处位置不同、深部地幔物质活动规模的性质差异、受邻近板块影响的不同和早期已形成的构造性质差异及其发展阶段的不同,而呈现了由内陆原始裂谷型盆地至原洋裂谷型盆地的演化系列,并且形成了以离散型为主的、由陆相演化为海相沉积的含油气盆地。这些带和盆地是:(1)东北型双弧后陆缘扩张沉降带及其 Bauhinia off - mainland China and the vast sea to the east of the Wuling fault zone, belongs to the continental margin expansion region in the east of the plate of China and is a continental margin where the structural changes have been very active since Mesozoic and Cenozoic. It regularly distributes five different types of continental margin dips. Due to the different locations, the nature of the material activity in the deep mantle is characterized by the differences in the influence of the adjacent plates and the differences in the early-formed tectonic properties and the different stages of its development, from the primitive inland rift basin to the original ocean Rift basin evolution series, and the formation of a discrete-based, evolved from continental marine sedimentary petroliferous basin. These belts and basins are: (1) northeast double-arc post-continental expansion subsidence belt and its