Hydrocarbon-generating potentials of the Neoproterozoic in Xuhuai area,the east part of southern North China
Li Zhensheng1, Liu Deliang2, Wu Xiaoqi3, Wang Guangli4, Wang Tieguan4
1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009;
2. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026;
3. Department of Petroleum Geology, Exploration and Development Research Institute, PetroChina Beijing 100083;
4. College of Geosciences, China University of Petroleum, Beijing 102249
Based on the synthetical analyses of stratigraphic characters,organic geochemical indexes and lithofacies paleogeography,the probability of the Neoproterozoic source rocks and primary petroleum reservoirs in Xuhuai area was discussed.Xuhuai area locates in the east part of southern North China and is divided into Huainan and Huaibei district by Bengbu-Jieshou ancient uplift.Lower mudstones of Liulaobei Formation and upper carbonates of Jiayuan to Weiji Formation reached just the standard of hydrocarbon source rocks,and the latter could subdivided into Jiayuan to Jiudingshan Formation and Zhangqu to Weiji Formation.The Neoproterozoic source rocks contain low abundance of organic matter and Ⅰ-type kerogen with the mature to over-mature stages of thermal evolution.The hydrocarbon source quality of Liulaobei Formation,Zhangqu to Weiji Formation and Jiayuan to Jiudingshan Formation become worse in turn,and the Huaibei district was better than the Huainan district.The surrounding area of Bengbu-Jieshou ancient uplift with lower thermal evolution is favorable prospect areas.