REVIEW ON THE HISTORY,EXPERIENCES AND LESSONS FROM PETROLEUM DISCOVERY IN ORDOS BASIN (I):IMPLICATIONS OF THE TALK BY LI SIGUANG IN 1968

The history of oil and gas exploration in Ordos Basin is long.Before the founding of new China,few of oil and gas surveying has been done in the basin.A lot of systematic petroleum geological survey and exploration began after the founding of new China.During the 14 years from 1955 to 1968,a large number of geological data have been accumulated,but neither commercial petroleum has been found,nor definite prospects or targets have been determined.Since 1969,according to the instruction of return to Ordos Basin,the petroleum exploration came back to Ordos Basin from Weihe and Hetao Graben.Six Jurassic oil fields in Qingyang,Huachi and Wuqi,five large oil fields over hundred-million tons in northern Yanan-Wuqi,and a large Ordovician gas field in centre of the basin had discovered successively.History of petroleum exploration in Ordos Basin showed that oil and gas discovery comes from geologist's idea.We should attach great importance to basic geologic survey.Application of geologic surveying methods and exploration procedure must have pertinence.Neither can simplify the complicated issues,nor can generally approach the special problems.The exploration areas must be determined according to the actual situation.