Abstract:

Most of the oil and gas reserves in Jianghan basin occurs in series of salt-lacustrine sediments deposided in a highly restricted rifting environment during the later Eogene.Their accumulation is governed both by sandstones derived from subaqueous alluvial fans at north part of the salt lake and halokinetic anticlines in a vortex structural system.This is a particular type different from any other reservoirs known.During exploration,the study of regional geology has played an important part in successful locating potential source sag and selecting main target bedds.But enough attention had not been paid to oil accumulation governed by lithofacies,and necessary means of exploration had been lacked,we had gone a wrong way for a period of time in predicting oil fields.However,as soon as the horizons of sandstones and composite components of structures necessary for oil accumulatoin have been identified,a series of oil fields which contain majority of oil reserves in the basin has been under way of discovering.According to the recognition summed up in this paper,some suggestions has been proposed for future prospecting.