FAULTING AND ITS RELATION TO PETROLEUM ACCUMULATION IN PETROLIFEROUS AREA OF NORTHWEST CHINA

While searching for petroleum in petroliferous basin formed by compressional stress,much attention must be paid to the faults developed on the margin of a basin;and to the drag folds and faulting blocks which were formed due to faulting.In these areas,petroleum is likely to accumulate,and to form a petroleum field.The formation,evolution of a petroliferous basin and petroleum accumulations are closely related to faulting.For example,the petroliferous structural zones of the petroleum distributing area in Northwest China are mostly controlled by faulting.