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我国南方海相页岩气资源潜力巨大,勘探开发活动活跃,目前已经在四川盆地南部威远、长宁等区取得重大进展。但对于页岩气储层精细划分还缺乏有效的手段,对页岩气水平井开发箱体的确定还有争议。通过对威远页岩气田威202井上奥陶统五峰组—下志留统龙马溪组笔石和三叶虫等重要生物化石的鉴定,结合区域地层特征将其划分到笔石带,并确定五峰组和龙马溪组下部的笔石带为最优储层,提出威202井区在奥陶纪末期五峰组、观音桥层及志留纪初期龙马溪组剖面和湖北宜昌王家湾剖面可以对比,具有重要的地层对比意义。
The marine shale gas resources in southern China have great potential and active exploration and development activities. At present, significant progress has been made in the areas of Weiyuan and Changning in southern Sichuan Basin. However, there is still no effective means for the fine division of shale gas reservoirs, and there is still controversy about the determination of shale gas horizontal well development tanks. Through the identification of the important Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation pen-stone and trilobite and other important biological fossils in Weiao 202 well in Weiyuan shale gas field, combining with the regional stratigraphic characteristics, it is divided into pen-stone belts and the five peaks And the Lower Peninsula of Longmaxi Formation are the optimal reservoirs. It is suggested that the W202 well can be compared with the profiles of Wufeng Formation, Guanyin Bridge and Longmaxi Formation in the early Silurian and Wangjiawan, Yichang, Hubei in the late Ordovician, It has important stratigraphic contrast significance.