下扬子地区古生界页岩气地质条件与勘探前景

Shale-gas geological conditions and exploration prospect of the Paleozoic marine strata in lower Yangtze area,China

通过对下扬子地区海相古生界暗色泥页岩发育的构造背景、沉积环境、空间展布、地球化学参数等的分析,认为下扬子地区海相古生界暗色泥页岩具备了页岩气富集的基本条件,提出了2套重点目的层,即下寒武统荷塘组和上二叠统龙潭组,并针对这2套泥页岩发育的层位分别提出了有利勘探区。同时认为,后期改造相对较弱的地区应该是页岩气勘探开发的主战场。

Based on studies of tectonic setting, sedimentary environment, spatial distribution and geochemistry parameters of Paleozoic marine mudstone and shale in Yangtze area, the paper suggests that the black mudstone and shale have basic geological conditions for shale-gas occurrence and accumulations, and puts forward two sets of significance exploration stratum, viz Hetang Formation of Low- er Cambrian and Longtan Formation of Upper Permian and suggests the favorable exploration area, respectively. The weakness area of tectonics deformation and structural destruction, with great potential of shale gas resource, should be priority of shale gas exploration and development in the lower Yangtze area.