The Research On Hydrocarbon Enrichment Regularity Of Chang2Oil Bearing Formation In Zichang Wang Jiawan Area

In recent years the development of Northern Shaanxi area of oil and gas explorationfieldincreased,Zichang oilfield especially long petroleum exploration and development,2oilgroup has achieved very good results. But because of relatively low on the stratigraphicdivision and correlation of degree, small layer classificationaccuracy is not enough, theimpact of each sublayer sedimentary microfacies and sand body distribution of cognition, thefavorable reservoir facies belt distributionclearly; the basic characteristics of the reservoir inthis area is relatively weak, thedegree of the source area of oil and gas and oil gas migration islow, oil and gas accumulation is not clear, increase the difficulty for the exploration anddevelopment stage. Therefore, the area of the formation of oil and gas accumulation of therefinement and in-depth research.In the learning of sedimentary cycle and constant thickness in this paper, the bed ofChang2in Wangjiawan area is subdivided into Chang23、Chang22and Chang21in ascendingorder, according to the obvious gamma ray curve and that one’s property of rock （thesedimentary cycle and the marker bed of K9）,the Chang22and Chang21are detailedlysubdivided into Chang21-1,Chang21-2,Chang21-3,Chang22-1and Chang22-2five small reservoirsegments.On this basis, studying on the characteristics of Chang2reservoir with the reservoirpetrology、characteristic of physical property,diagenetic features,hole structure ect. Evaluationof Chang8reservoir according to the data of characteristic of the Chang2reservoir.Conclusion: Chang21-1in the local area distribution between North River deposition, therest mostly channel deposition and channel flank, the main river zonal distribution.The bodyof Chang2reservoir is mostly distributed in the area of nasal appearance uplift,the oil-gas iscontrolled by lithologic and physical property.The enrichment pattern of oil-gas is mainlyintegrated controlled by the transform of sedimentary facies and reservoir physical property, agood resoure reservoir area, the vertical migration channels.Under the guidance of the law,wecan predict exploration region of Chang2stratum and provide geology references for thefuture exploration at last.