Abstract:

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.

Key words: Nanpanjiang Basin, Carboniferous, sedimentary system, deep-water deposition, favorable areas of shale-gas