Forming mechanism and geophysical features of associated diapir structure in Dongxin Oilfield

Key words:  associated diapir structure  Dongxin Oilfield  fault cutting  development of dynamic

Abstract:

The forming mechanism and geophysical characteristics of associated diapir structure in Dongxin Oilfield were studied based on the seismic interpretation results of high precision three dimensional seismic data. The results show that "Y" type fault combination is the common associated diapir structure in Dongxin Oilfield, and "X "type fault combination is a major factor in the formation of fault system. "X" type faults, there are two cutting methods, one of which appears in the concentration area at the top of arch, taking place at the same grade or different grade faults; the other one is caused by tension at major faults in the arch for the passage. The pressure change of faults should be analyzed during fixed period. The pressure on lower grade faults is bigger than that on higher grade faults during certain period, and lower grade faults could cut through higher grade faults. This interpretation could solve multi department structure mapping of the confusion, and some of the sequence was cut off grade level to improve, which could help in fault sealing analysis and reasonable interpretation of relations between oil and water.