OIL-GAS POOL TYPES AND THEIR DISTRIBUTION CHARACTERISTICS OF DONGXIN COMPLEX FAULT-BLOCK OIL & GAS FIELD

The oil-gas pool types and their occurrences in the largest fault block oil and gas field of China,Dongxin oil-gas field,are mainly discussed in the paper.The oil and gas pools can be divided into fault bolck,fault-nose,lithologic,and combining types of fault and lithologic ones,etc.,and fault-block pool is the most important among them.In the fault blocks,the multiple oil and gas pools,usually a few dozens,occurred vertically along fault as a superposition pattern.From the lower hydrocarbon-bearing horizons to the upper ones,oil pools,oil-gas pools and gas pools occur in turn.The distributions of oil and gas in different fault-blocks are uneven,and both flanks of the fault-anticline zone concentrated more oil and gas than other parts of the structure.Faults played an important role during the migration and accumulation of hydrocarbons,and it is the double parts both barriers and passways to fluid migration that formed multiple petroliferous horizons in Dongxin complex fault-block oil-gas field.