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湖北南部二迭系是主要勘探目的层之一,分布较广泛。经过历年来的勘探,已在湖北、四川交界的建南地区找到工业性气田、龙驹坝含气构造,并发现油气苗、沥青共150余处,证实该区有过油气生成的历程。油气苗、沥青的分布具有一定的规律性,如桑植、石门一带主要为油苗;兴山、天门、芦市一带为油气苗;建南主要为干气;当阳地区为碳沥青及二氧化碳。不同地区油气苗性质不一,初步分析,认为是受热演化程度高低所致。现将本区二迭系油气演化特征简述如下:
The Permian system in southern Hubei is one of the major exploration target layers, with a wider distribution. After years of exploration, industrial gas fields and the Longjuba gas structure have been found in the Jiannan area at the junction of Hubei Province and Sichuan Province. More than 150 oil and gas sprouts and bitumen have been discovered, confirming the history of hydrocarbon generation in this area. The distribution of oil and gas seedlings and bitumen has certain regularity. For example, Sangzhi and Shimen areas are mainly oil seedlings; Xingshan, Tianmen and Lushi are oil and gas seedlings; Jiannan mainly is dry gas; Dangyang area is carbon asphalt and carbon dioxide . Oil and gas in different regions of different nature, preliminary analysis, that is due to the degree of thermal evolution. The evolution characteristics of the two series of oil and gas in this area are summarized as follows: