Fault System Division And Its In The Role Of Hydrocarbon Accumulation

At present, in the Sanzhao Depression, there are two main views of set the oil source faults of the “reversed” migration, one of the views is the fault from T2 throw to the layer of T06, another view is only the upper part of the fault disappeared into T2, this type of faults is the main oil source faults. However, in fact, the migration patterns of oil is closely related to the important geological phenomenon, that is the phenomenon of vertical segmentation growth of fault, this is the key of cannot be accurately set oil source fault.Research the development situation and distribution characteristics of the faults in the Fuyang oil layer of Sanzhao Depression, divide into fault system in the combination with fault formation time and evolution of fault. Analysis of the type of oil accumulation and its distribution, to determine the oil accumulation period.By observing the change of the stratigraphic throw, the change of throw value in the displacement-distance curve, and extensional fault-propagation folding are widespread, to identify the phenomenon of vertical segmentation growth of fault. Use Poisson’s ratio and Young’s modulus as mechanical evidence of vertical segmentation growth of fault, when the value of Poisson’s ratio is greater than 0.25, at the same time the value of Young’s modulus is greater than 5×104MPa, the rock is generally characterized by plastic deformation. Through the establishment of quantitative analysis chart, to determine the fault connection status.On the basis of field examples, physical modeling and typical seismic analysis, analysis of the coupling relationship between the regular of fault activity with oil accumulation, in combination with the fine anatomy of oil accumulation, to determine the oil source faults of Fuyang oil layer of Sanzhao Depression, in the end, determined that only communicate source rock-reservoir, activities in the accumulation period and vertical segmentation growth of fault,are the really oil source faults in Fuyang Oil layer. This research to provide guidance of exploring Fuyang oil layer of Songliao Basin.