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建南长兴组生物礁气藏是我国已探明的第一个礁型气藏。该气藏位于川东断褶带东缘,石柱复向斜内的建南构造北高点。生物礁发育在上二叠统长兴组中部(长二段)。现已查明生物礁高156米,面积15平方公里左右;造礁生物以海绵、层孔虫、蓝绿藻为主,为一障积～粘结型生物礁。在礁核区,气井单井天然气无阻流量为82～74万方/日。气藏边界为生物礁岩性圈闭,气水分布受今构造控制。长兴组在鄂西—川东一带,一般厚240—400米,为一套富含生物碎屑的开阔台地相沉积,而在利川县见天坝—花椒坪近南北向一线以东,厚度急剧减薄至100米以下,为一套普遍含硅泥质的泥晶灰岩盆地相沉积。在开阔台地相区的边缘,1977～1978年江汉石油学院师生及南研所鄂西
The Jianxing Changxing Formation biohermal gas reservoir is the first reef gas reservoir that has been proven in China. The gas reservoir is located in the eastern edge of the eastern Sichuan fold belt, Jian Zhuang syncline within the Jiannan high point. Reef development in the Upper Permian Changxing Formation in the middle (long second section). Has been identified bio-reef height of 156 meters, an area of about 15 square kilometers; reef organisms to sponge, stomatal, blue-green algae-based, as a barrier plot ~ bond reef. In the reef area, gas wells unobstructed natural gas unobstructed flow of 82 to 740,000 square / day. The boundary of gas reservoir is bio-reef lithologic trap, and the gas-water distribution is controlled by the present structure. Changxing Formation in western Hubei Province - East Sichuan Province, the general thickness of 240-400 meters, is a set of open platform for sediment rich in biological debris, and see the day dam in Lichuan - Jiaojiao Ping near the north-south line to the east, the thickness of sharp Thinning to less than 100 meters, a set of generally siliceous muddy limestone basin sediments. On the edge of the open platform area, from 1977 to 1978, Jianghan Petroleum Institute teachers and students and Nanyan Institute of Western Hubei