Contemporaneous Faulting and of Sandbody Control in PN Oilfield

Abstract

This paper investigates the structural feature of X area in PN oilfield and expounds the control function which contemporaneous faults do to the sandstone bodies. Considering the research of the fault growth index, the fault stretching rate and the stretching rate, it can be sure that the activities of a contemporaneous fault happen mainly in the period of Qingshankou Fm the period of Yaojia Fm~ nen the first or the second segments and also the third or the fourth segments. According to the thickening of the weight at each unit time in P reservoir, the strong activity period of contemporaneous faults located in PI3 time unit. Through researches on the distance curve of fault throw and of the ancient fault throw, the growth of contemporaneous faults has an overall performance that it has multi-episodic activity of faults in vertical and different sections on different locations in horizontal. Summarized two kinds of sandbody control methods:The way using downthrown block of contemporaneous fault and sectioning the growing point. The downthrown block of contemporaneous fault method has the same evolutionary series with stratigraphic deposition; the type of sandbody control depends on the evolution of sedimentary environment.