1 Chengdu Institute of Geology and Mineral Resources,Chengdu 610081,Sichuan 2 Key Laboratory of Sedimentary Basins and Oil and Gas Resources of Ministry of Land and Resources,Chengdu 610081,Sichuan
Abstract：The platform facies and bank facies are important petroleum exploration target areas of the Cambrian Epoch 3-Furongian in the Middle and Upper Yangtze region. Based on the data of outcrops,wells,regional geology and previous studies,five types of sedimentary facies were identified, i.e., tidal-flat,platform,platform margin,shelf and deep-water basin, and palaeogeography maps were drawn and the basic geological conditions of the reservoirs and caprocks in Epoch 3-Furongian were discussed. (1)In the Epoch 3,restricted platform on which extensive lagoon developed nearly occupied the most areas of the Middle and Upper Yangtze region, the tidal flat distributed in the west, and banks developed at the margin and inside of platform. But the complete platform margin had not formed,the mixed shelf developed in northwestern Hunan Province. To the east of southeastern margin of Yangzte region,carbonate rocks reduced gradually. (2)As the regression in the Furongian,the uplifts expanded and deep-water basin shrunk sharply. The rimmed carbonate platform gradually formed with banks. (3)From the Epoch 3 to Furongian, restricted platform and open platform with dolostones were beneficial reservoir traps, as well as widely distributed oolitic banks and sand-sized intraclast banks. The widely developed lagoon deposits in the Epoch 3 were the significant caprocks,where the dolosontes with intercalated beds including gypsum-dolostones,dolomitic-gypsum rocks,gypsum rocks and siltstones with large thickness were deposited.
Liang Wei,Mou Chuanlong,Zhou Kenken et al. Palaeogeography of the Cambrian Epoch 3-Furongian in the Middle and Upper Yangtze region[J]. JOPC, 2015, 17(2): 172-185.
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