渝东南地区常压页岩气储层中矿物与微量元素地球化学特征

Geochemical Characteristics of Minerals and Trace Elements in Atmospheric Shale Gas Reservoirs in Southeastern Chongqing

渝东南盆地边缘过渡带是我国大气页岩气勘探的热点。目前通过研究页岩中矿物和元素的地球化学特征,可以有效的解释沉积环境与古生产力,分析有机质富集规律等,为页岩气勘探开发提供重要的参考。对研究区常压页岩气藏五峰-龙马溪组的古环境及有机质富集规律有待进一步研究。为此,对武隆、彭水区块2口井的岩心样品进行元素分析。结果表明,武隆,彭水区块五峰-龙马溪组(1)~(3)小层优质气层段是页岩勘探开发的“甜点”段。

The transitional zone of the southeastern Chongqing Basin margin is the hot spot of atmospheric shale gas exploration in China.Through the present research on the geochemical characteristics of minerals and elements in shales,the sedimentary environment and palaeo-productivity can be effectively explained,and the law of organic matter enrichment can be analyzed,which will provide an important reference for shale gas exploration and development.The palaeoenvironment and organic matter enrichment of atmospheric shale gas reservoirs in Wufeng-Longmaxi Formation in the area need to be further studied.The elements of the core samples from two wells in Wulong and Pengshui Block are analyzed.The results show that(1)~(3)high-quality gas reservoirs of Wufeng-Longmaxi Formations in Wulong and Pengshui Block are the“sweet spots”for shale exploration and development.