四川盆地寒武系底部黑色岩段对比与沉积相初探

Stratigraphic Correlation and Sedimentary Facies of the Black Member in the Bottom of the Cambrian in the Sichuan Basin

对四川盆地及周缘寒武系底部黑色段剖面的实地考查、测制,结合钻井研究厘定了筇竹寺组与沧浪铺组的分界线,认为盆缘寒武系底部黑色段的筇竹寺、牛蹄塘、水井坨组与可比的长江沟组、青坪组、沙滩段属同一层位;重庆东南秀山一带杨家坪组,仅相当峡区的水井坨组底部;确定了石牌页岩是仙女洞段灰岩的相变。通过研究地层厚度,计算了砂/地比、灰/地比,根据层序、层理和各种浅水构造重塑岩相古地理。在全盆地圈定了深水陆棚、浅水陆棚及滨岸体系及滨岸三角洲分布区。为该区页岩气藏勘探提供了参考。

The study indicates that the Qiongzhusi,Niutitang and Shuijingtuo Formations in the Black Member in the Bottom of the Cambrian in the Sichuan basin and its periphery may be correlated to Changjianggou and Qingping Formation and Shatan Member and the Yangjiaping Formation in Xiushan is correlated to the bottom of the Shuijingtuo Formation.The Xiannüdong limestone changes into the Shipai shale.Deep shelf,shallow shelf,shore-delta and shore systems are delineated in the whole Sichuan basin,providing new targets for shale gas reservoir exploration.