AN APPROACH TO THE REGULARITY OF OIL/GAS DISTRIBUTON IN PALEOGENE DEPRES-SIONS WITH A PRACTICAL EXAMPLE OF A PETROLIFEROUS AREA IN NORTH CHINA

The depressions of paleogene are rich in oil/gas resources and hundrands of oil/gas fields have been discovered. Large oil fields are not only distributed in large depressions but also in small-scale depressions. In some small but rich in oil and gas depressions, the oil reserve can reach 100-150 million ton within a thousand sq.Km. The distributions of oil/gas in depressions are controlled by three key factors of space configulation, growth faults and depositional system of source rocks. The various depressions would contain different oil and gas accumulations due to the changes of the three factors, then formed various types of oil and gas pools.