扬子地区二叠系油气地质条件综合研究

A COMPREHENSIVE STUDY ON PETROLEUM GEOLOGIC CONDITIONS IN PERMIAN, YANGTZE AREA

扬子地区横跨中国南方的中部及西部。在二叠纪，由于早期的广泛海侵及后期的多次构造活动，形成了海相、陆相交互发育的一套地层系列。其中烃源岩以栖霞组和孤峰组的暗色石灰岩以及泥岩、泥页岩为主，有机碳含量较高，热演化程度较低。油气储集岩主要包括碳酸盐岩和碎屑岩两类。沉积盖层以上覆的石膏岩及二叠系的石灰岩、泥质石灰岩、泥页岩、硅岩为主。扬子地区的桃源、通山、九江至南京、句容、南通的长江沿线地区为最有利的油气勘探区，万县、泸州、上思、个旧及西昌西方的九龙等地区为油气勘探的较有利地区。

Yangtze area locates across the central and western of South China. In Permian, a series of strata of continental oceanic interaction facies in this area were deposited, influenced by early widespread progression and several tectonic movements in later stage. The source rock is primary dark limestone, mudstone and argillutite in Xixia and Gufeng formations, which has a high organic carbon concentration but a low degree of thermal evolution. The reservoir mainly includes two types of rocks, which are carbonate and clastic rocks. The overlying gypsolith, Permian limestone, argillaceous limestone and silicalite mainly constitute the cap rock. According to the geologic conditions, the most advantageous area for petroleum exploration locates along the Yangtze River, from Taoyuan, Tongshan, Jiujiang to Nanjing, Jurong and Nantong in Yangtze area.