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晚古生代华南陆块（扬子及南华加里东褶皱带）是古特提斯洋中的一个陆板块，周缘为由早期的陆内断陷，至晚期演变为拉张离散的被动大陆边缘（北缘南秦岭海槽属于陆内拗拉槽）。陆块内部则由海西早期的湘洼海盆逐步海侵达到中下扬子，至石炭纪末期的云南运动，迎来了华南区二、三叠纪广覆性海侵，形成周缘为岛链环绕、内部台、盆分异的受限陆表海，类似于今日之南海海盆和加勒比海海盆的地理格局，且规模相当，而南海海盆和加勒比海海盆今日之丰富的油气资源，说明华南，尤其是扬子区二、三叠系受限陆表海盆有寻找大油气田的前提条件。
Late Paleozoic South China block (Yangtze and South China Caledonian fold belt) is a continental plate in the ancient Tethys Ocean, the periphery is from the early intracontinental rift to the late evolution of the discrete passive continental margin (north margin South Qinling trough is a continental aulacese). In the interior of the block, the gradual transgression of the Xiangwa basin in the Hercynian reaches the middle-lower Yangtze, and the Yunnan movement to the end of the Carboniferous embodies the second and third Triassic wide- Which is similar to the geographical pattern of today’s South China Sea Basin and the Caribbean Sea Basin, and is quite large in scale. However, abundant oil and gas resources in the South China Sea Basin and the Caribbean Basin today illustrate that South China, especially the Yangtze River The preconditions for finding a large oil and gas field in the Second and Triassic restricted land surface sea basins.