Identification and description of small faulted-block reservoirs

The practice of petroleum exploration and development shows that there are still great oil reserves undiscovered in different small faulted-block reservoirs in the late-period development of faulted-block oilfield.The small faulted-block reservoirs are secret in the subtle oil-pools and difficult to be found out.The investigation of physical stimulation and stress-field analysis on different types of fault zones showed that the faulted-block oilfields occurred in six types of fault zones in the rift basin of the eastern China.The small faults formed faulted-block traps at the conjunction of two or three big faults,turning points and stress immerging area of a big fault.The faulted-block traps have good condition for generating reservoirs at the connections of the small and big faults.Having predicted the possible distributions of the small faulted-block reservoirs,150 faulted-block reservoirs in the developed faulted-block area of Shengli Oilfield were identified and described by applying the integrated high-precision seismic survey technique.Although oil reserves are small in the small faulted-block reservoirs,a great benefit can be received because of the good equipments for the late-period development in the studied areas.The small faulted-block reservoirs are the important targets for increasing oil reserves and production of the faulted-block oilfields in the rift basins of East China.