HR: 0800h
AN: MR41A-0910    [Abstracts]
TI: Remote Sensing Detecting for Hydrocarbon Microseepage and Relationship with the Uranium Mineralization in Dongsheng Area, Ordos Basin, China
AU: * Zhu, M
MR41A-0910 AF: East China Institute of Technology, ECIT, Fuzhou, JX 344000 China
AU: Liu, D
MR41A-0910 AF: Beijing Research Institute of Uranium Geology, BRIUG, Beijing, 100029 China
AU: Gao, Y
MR41A-0910 AF: China University of Mining & Technology, CUMT, Beijing, 100081 China
AB: The Ordos Basin is located at the central area of northern China with an area of about 250,000 km2. It is well known "a basin of energy resources" of China for its large reserves of coal, oil and gas. A large-scale sandstone-type uranium metallogenic belt has been found recently in Zhiluo Formation of middle Jurassic in Dongsheng area in the northeastern part of the basin. The ore-forming mechanism remains unsolved so far. There is a hypothesis that the uranium precipitation was related to a hydrocarbon migration from the central basin. In order to explore the evidences of ever existed hydrocarbon microseepage and migration in this area, several indices such as the Iron Oxide Index, Ferrous Index, Clay Mineral Index, Mineral Composite Index, and Ferrous Transfer Percentage Index have been derived. Thorium Normalization of aeroradiometric data and fusion of aeroradiometric and TM data have been carried out as well. Therefore, the subaerial oxide and reduced area, uranium outmigrated and immigrated area, and ancient recharge and discharge of groundwater are thus delineated. As a result, two hydrocarbon microseepage belts in Dongsheng area have been extracted by combining the methods mentioned above. One is in the northern of Dongsheng along a nearly east-westward fault zone and the other one is in the southern of Dongsheng uranium mineralization belt along a nearly northwestward fault zone. The study suggests that the subaerial reduced area was related to hydrocarbon microseepage and the hydrocarbon migration along the fault and fracture zone or penetrable strata played an important role for uranium deposition in Zhiluo Formation near the northwestward fault zone.
DE: 0933 Remote sensing
DE: 3004 Gas and hydrate systems
DE: 3617 Alteration and weathering processes (1039)
SC: Mineral and Rock Physics [MR]
MN: Fall Meeting 2005