南盘江盆地石炭系沉积体系及页岩气有利区带

综合利用重点剖面实测资料、区域地质调查资料，结合公开发表的成果，讨论了南盘江盆地石炭系沉积体系类型、特征及其分布规律，基于深水沉积相带的分布，预测了南盘江盆地石炭系页岩气有利区。南盘江盆地石炭系发育三角洲—碎屑滨岸、滨海沼泽、陆源碎屑陆架、碎屑陆坡、局限海台地、开阔海台地、台地边缘、深水盆地8种沉积体系。石炭纪，马关隆起、康滇隆起、江南隆起及云开隆起为暴露剥蚀区，但陆源碎屑供应较弱，陆源碎屑沉积主要发育于石炭纪早期，整个石炭纪以内源沉积占优势。早石炭世，云开隆起周边发育陆源碎屑滨岸沉积，在江南隆起南缘发育碎屑滨岸和滨海沼泽沉积，主体为局限台地—开阔台地—孤立台地—台地边缘—深海的沉积格局。晚石炭世，隆起区和深海区均有所缩小，开阔台地范围显著扩大，隆起周缘主要发育局限台地。南丹—河池、罗甸西、柳城—鹿寨—平乐地区、象州—武宣—桂平等地区上古生界出露地表，石炭系埋藏浅，且以深海沉积为主，是寻找石炭系页岩气最为有利的地区。

Sedimentary System and the Shale gas Favorable Area of the Carboniferous in the Nanpanjiang Basin

Synthetically utilized the data of key profiles and regional geological survey data, combined with published research results，the sedimentary system types, characteristics and distribution of the Carboniferous in the Nanpanjiang Basin have been discussed, and based on the distribution of deep water facies, the shale gas favorable areas of the Carboniferous in the Nanpanjiang Basin have been predicted. There were 8 sedimentary systems, such as river delta clastic littoral, coastal marsh, terrigenous shelf, terrigenous slope, restricted platform, open platform, platform margin, slope and deep sea, developed during Carboniferous in the Nanpanjiang Basin. During Carboniferous, the exposed or denuded area located the uplifts of Maguan, Kangdian, Jiangnan and Yunkai, but the terrigenous supply is relatively small, the terrigenous sediments mainly developed in Early Carboniferous, the carbonate and mud sediments dominated in Carboniferous. During Early Carboniferous, the clastic littoral deposits developed surrounding the Yunkai Uplift, the clastic littoral and the coastal marsh develo ped in the south margin of the Jiangnan Uplift, the main sedimentary systems consisted of the restricted platform, open platform, platform margin, slope and deep sea. During Late Carboniferous, both the uplift and the deep sea depositional areas are reduced, the open platform range significantly expanded, the restricted platform developed nearby the uplifts. The regions of Nandan Hechi, western Luodian,Liucheng Luzai Pingle and Xiang zhou Wuxuan Guiping, the Upper Paleozoic exposed surface, the Carboniferous shallow buried and dominated by deep sea sediments, are the most favorable areas for the exploration of shale gas of the Carboniferous in the Nanpanjiang Basin.