Seismic Sedimentology And Its Application Of Jurassic Xishanyao Formation In Alade Oilfieid

Alade Oilfieid is tectonically located on the West uplift on the southern slope of Hashan tectonic belt in the northwestern margin of the Junggar basin.Haqian 22 well area is shallow in Hashan three-dimensional coverage,the shallow main frequency is 25 hz.The number of drilling wells is 3,of which 2 are coring wells.The pre research degree of this block is relatively low and the well control degree is poor,the type of sedimentary facies,plane distribution and its evolution law are not clear.Therefore reservoir exploration and development is constrained.So it is necessary to explore the research methods of combining well and seismic to implement isochronous stratigraphic frameworks and sedimentary facies distribution to provide a geological basis for reservoir development.The area of the study area is large,The distribution law of isochronous stratigraphic between the well can not be determined by the well data.We need to carry out isochronous stratigraphic frameworks research based on seismic sedimentology.The stratigraphic interface is divided and explained by using the method of "cycle comparison,hierarchical control and well seismic combination".Based on the sedimentary evolution law revealed by core and well logging,the formation of Xishanyao group is divided into one second order sequence and two third order sequences by combining classic sequence stratigraphy and multi-scale wavelet decomposition technology.And the Xishanyao group is divided into 3 small layers.And use the seismic wavelet multi-scale decomposition technique for horizon interpretation and fault interpretation,thus the different orders of sequence stratigraphic framework are established.In the study area,the formation change of a section of the formation of the overall thickness is small,the No.1 small layer is the most thin,the No.2 small layer is the most thick,Formation development is relatively stable.On the basis of the regional sedimentary background,the development of fan delta deposits in the study area is determined by the analysis of the coring well.Combining with lithofacies,logging facies,seismic phase analysis to divide sedimentary microfacies types.Studying the sedimentary microfacies vertical distribution by single well facies analysis.Carrying out the study area fan delta sedimentary micro facies seismic sedimentology characterizations under the guidance of typical modern fan delta deposition.Using forward modeling technique to study the stage of the superimposed sand bodies;using the seismic attributes to describe the sedimentary microfacies boundary;using attribute selection and seismic inversion to predict the distribution of sand bodies.Finally we established a fan delta sedimentary strata of the Xishanyao formation.Sand body migration stack in vertical,crony distribution in plane,horizontal sedimentary microfacies from plain main channel to the leading edge of the braided channel,mouth bar,sheet sand and shore shallow lake evolution of sedimentary facies distribution patterns,reveals the sedimentary evolution of the target layer.