Research And Application Of Fault Identification Technology Based On Coherency And Curvature Properties

Faults in the oil exploration is a very important issue for Reservoirs development,the current context of the world's oil and gas exploration and development process,the fractured reservoirs' proportion is increasing (Discussion of pre-stack fracturedetection Technical ).Because of this, fractured reservoir exploration has a veryimportant significance for the development of China's future oil industry.Seismicinterpretation in general, we need to constrain the conventional layer faultinterpretation of the results to control the fault interpretation, to determine the samelevel of fault.The disadvantage of this interpretation is the large human labor, longcycle, in particular working towards the region of the fault is unknown when manyfaults to explain the combination of fault is very difficult.In the past, the traditionalinterpretation, is identified by visual inspection of reflector discontinuities for faultinterpretation. For minor faults, uncertainty is very serious, because the smallDiscontinuous features of Phase axis of the reflector, the process may be smoothedout or even completely removed, in addition to geophysical interpretation, membersof hope to obtain methods not rely on a human auto-detection,through Structureinformation of the seismic data,to improve the fault interpretation speed.In summary,it is very meaningful for the research of faults' automatic detection and recognitionusing of the geometric seismic attributes.The main object of study is the seismiccoherence and curvature properties, the paper carried out the following aspects of thestudy, and achieved a certain understanding:First,based on introducing the principle of coherent technology, coherent andcoherent course of the algorithm technology trends,analysis of coherence technologyis very sensitive to the discontinuity, and is widely used in the identification of faultsand fractures.These were discussed, the first generation C1 algorithm based onmutual coherence,the second generation algorithm C 2 based on similarmulti-channel,and the structure of the third generation coherence algorithm C 3 basedon Feature Structure, implementation of Second and third generation of coherent,andthe selecting method of the various parameters;Secondly, based on the inadequate of intrinsic value's coherence seismicattributes,transformation was carried out,achieved a coherency analysis comparisonbased on body impedance inversion of seismic data,and applied to real seismic datas'fault identification,and the effect was very good. Third, based on the inadequate of intrinsic value's coherence seismicattributes,transformation was carried out,achieved Comparative Analysis of Coherentbased on the generalized S transform and efficient decomposition of time-frequencyspectrum,and applied to fault identification of real seismic data,combination of profiledescription analysis,the effect was very good.Finally, this paper introduces the basic theory of the curvature properties,Afteranalysis of the limitations of the actual data processing,in turn without filtering andafter median filtering, and with Gaussian filtering,proposed a application of curvatureproperties based on Iterative two-dimensional Gaussian smoothing filter,to achieveeffective identification of geological structure,such as Cracks, faults, bend andfold,have a good application effect.It has a certain effect for using attributions toprove curvature properties based on Iterative two-dimensional Gaussian smoothingfilter.