THE DELTA DEPOSITIONAL SYSTEM DISTRIBUTION OF LATE PALEOZOIC ERA IN ORDOS BASIN
FU Suo tang 1, TIAN Jing chun 1, CHEN Hong de 1, HOU Zhong jian 1, YANG Hua 2, FU Jin hua 2, FAN Zheng ping 2, SHI Xiao ying 2 (1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, China; 2. Changqing Oil Corporation, CNPC, China)
It has been proved by oil and gas exploration that most oil and gas resources occur in the sandbodies of the delta depositional system in Ordos basin. Therefore, it is very important to study the feature of plane distribution of the delta depositional system in Neopaleozoic. According to a quantity of drive well materials, this paper makes a deep study of the late Paleozoic delta depositional system in Ordos basin. The result indicates that it can be divided into two stages. The first stage is the late Carbonic Benxi period early Dias Taiyuan period, and it is delta depositional system of marine facies. The second stage is the early Permian Shanxi period late Permian Shiqianfeng period, and it is delta depositional system of lake facies. There are differences in the development background, composition of facies zone, type of sandbodies between these two kinds of the delta depositional systems. On the basis of the above, the paper discusses the feature of plane distribution of the delta depositional system. It is very useful for future oil and gas exploration.
【CateGory Index】： P544