The Application Of Impedance Inversion Based On Model In Liaohe Region

In the 21 st century,with the development of oil and gas exploration technology and innovation,the difficulty of oil and gas exploration is gradually improving.The key target transfers from structural reservoirs that can be easily found to complex reservoirs such as thin layers and lithology layers.Seismic inversion is one of the most important methods of reservoir prediction and a key component of geological comprehensive evaluation and interpretation.In the western part of the liaohe beach,the prospecting target is becoming complicated as the exploration level increases.There is not much correlation between sand content and P-wave impedance in faulted basins,and the prediction results cannot be guaranteed.Due to sedimentary facies control,there is inconsistency between sand content and low frequency trend of P-wave impedance,causing problems for seismic inversion modeling,which directly affects final seismic inversion results.The deeper the burial depth,the higher the impedance value;when different layers of sand and shale formation endure different pressure,wave impedance values within the same set will be different as well.Therefore,there is a distinction between faulted basin and conventional seismic inversion models.This paper builds an inversion model using uncompact sandstone percentage,directly compensating for the low frequency trend of the inversion model.In addition,the model's intermediate frequency is similar to P-wave impedance,ensuring that the inversion results are converged correctly.The final results of the inversion can be used directly as sandstone percentage.The aforementioned method was applied to Liaohe Beach in the Bijialing Region and obtained optimistic lithologic inversion effects: the results were well compared with deposition and identical to that of lithologic drilling.Horizontally,the dimension and distribution of sandbodies can be accurately determined;vertically,sandbodies that were difficult to distinguish from a conventional seismic section are successfully recognized.Overall,it has played a key role in predicting this region's reservoir layer.Area 2 is located in the liaohe oilfield Leijia region,S4 in shahejie formation developes carbonate rocks,which belong to dense reservoir.In recent years,the exploration continues to break and form the scale reserves.Based on the latest seismic data,this paper studies the effective reservoirs by careful processing and analysis,combined with the relevant drilling data.The specific research ideas are as follows:through the existing relevant data and research,thus the structural characteristics of the carbonate rock are preliminary understood.The study on the control of carbonate rock formation has been studied on the basis of this study.Based on the application of address statistics,the quality lithology is predicted.This paper also makes a detailed demonstration of the oil-bearing characteristics and the strict brittleness of the reservoir based on the pre-stack elastic parameters.In addition,this paper also analyzes the distribution of cracks and the depth of fractures by analyzing the anisotropic sub-corner crack prediction technology,so as to provide a good help and support for the search area of high-quality reservoir distribution area.