Seismic Inversion Methods In Denglouku Formation Of Weixing-Shengping Area

Northern Songliao Basin Weixing-Shengping area has experienced many years ofexploration and development, and many predecessorsd have been done at different levels formedium-shallow layers, but the depth of burial of Low Cretaceous Denglouku Formation islarge, and the number of wells is little,at present,the study and knowledge of the area is notenough.Based on Trace integral inversion, recursive inversion, model-based inversion theory ofthe three inversion methods, the inversion method of characteristics and inversion methodapplicable conditions and limitations of the analysis and research, and focused on theconstrained sparse spike inversion and geostatistical stochastic simulation inversion wereanalyzed and compared. the integrated seismic data, well logging data and geological data, inthis paper,seismic inversion technique for Weixing-Shengping area was analyzed and studiedto reveal the spatial distribution characteristics of the study area Denglouku Formationreservoir performance. On this basis, pointing out the favorable regions.On the basis of theory, I use InverTrace^Plus-constrained sparse spike inversion andStatMod-geostatistical stochastic simulation inversion module from Jason software. To studythe area, seismic inversion and sand thickness, porosity and permeability distribution of thecharacteristics of prediction.Through comparison of the practical applications, we can findthat the constrained sparse spike inversion has low resolution, high correlation with seismicdata and stableinversion result, but cannot meet the requirement of flaggy resolution.geostatistical stochastic simulation inversion combine thoroughly the seismic inversionmethod with Stochastic simulation Theory.Well data and the sparse spike inversion of theimpedance cooperate with stochastic simulation, which integrate the lateral resolution ofseismic data and the vertical resolution of logging data. But the result hasmultiplicity.According to the lithology and reservoir sensitive logging parameters analysis, itis found that the sand and shale can be well distinguished by P-impedance, but but LLD candistinct it well,Therefore,we selected LLD to inversion to finely described the spatialdistribution of the sand thickness in this area. and we used P-impedance co-simulationporosity and permeability, in order to determine the favorable regions.To find out the beneficial area block for the reservoir development according to thegeologic feature, the outcome of seismic inversion predict, and the materials researched byformer people.Mainly in Wangjiatun construct and the Shengping nose-like structure,channel sand for Denglouku sand gas reservoir exploration class Ⅰ favorable zone; other regions forClass Ⅱ zone.