页岩气及国内勘探前景展望

Shale Gas and Its Exploration Prospects in China

中国页岩气的勘探还处于起步阶段,与美国东部地区页岩气成藏地质条件进行初步对比发现,中国的许多盆地均具有页岩气成藏的地质条件,并有望成为页岩气勘探开发的主力战场。中国的中东部地区、南方地区、西北和青藏地区都具有良好的页岩气勘探前景。特别是南方地区有稳定厚层的富烃页岩地层分布,虽然后期构造作用强烈,但是由于页岩气具有典型的"自生自储"特点,抗破坏能力较强。南方的四川盆地已经找到了页岩气发育的直接证据,威远就是一个典型的实例。页岩气的勘探应首选有机质丰度和热演化程度高的区域,最好伴有天然裂缝的发育。

Shale gas exploration in China is still in its infancy. It is proven that shale gas occurs in most of Chinese basins by geologically comparing the hydrocarbon generation with those in the eastern U. S. These basins would be the key target for shale gas exploration. The mid-eastern region, the southern region, the northwestern region, and the Qinghai-Tibet region present broad prospect for shale gas exploration. The southern region in particular has stable thick hydrocarbon-rich shale formations. Shale gas, with a typical'self-generation and self-accumulation' feature, is resistant to damage, despite of the strong late tectonism. Direct evidence of shale gas development in Sichuan Basin has been found, e.g., Weiyuan. Shale gas exploration should start in the area of high organic matter abundance and high degree of thermal evolution, preferably accompanied by the development of natural cracks.