Research On Crack Detecition Based On Wavele Transtrom And Coherence Algorithm

The crack is the important reservoir space and path of the low penetrating oil gas pool's. The crack recognition and forecast is one of the main research directions of oil gas geophysical prospecting present.And then the earthquake method is one of most principal for the research of crack present,so now the research on crack detecition based on wavelet transtrom and coherence algorithm has the important meaning in application.The coherent data body technology is a way of using neighboring channel signal similarity to describe the stratum and lothological crosswise nonuniform.If the contact surface between neighboring channel has structure exceptionally, the oscillation amplitude, frequency and phase of the wave between neighboring channel will have the varying degree change,so the displays value of the coherent is small; If the contact surface between neighboring channel has not structure exceptionally, the oscillation amplitude, frequency and phase of the wave between neighboring channel will have not a big degree change,so the displays value of the coherent is big. With the help of the common earthquake coherent body technology, we can withdraw many kinds of useful information during the hideaway from the seismic data. It provides an effective and practical method to solve complex reservoir description of the geological body. But pure coherence technique can't fulfil seismic data interpretation of the fine.The wavelet transformation had the multi-criterion namely multi-resolution, wavelet analysis this characteristic has provided one kind of new direction for the crack marginal check.The characteristic of wavelet analysis has provided one kind of new direction for the crack marginal check,according to the actual situation of seismic data in the constructed wavelet function and its derivative wavelet function may separate the primary earthquake material according to the seismic data actual situation structure after a wavelet transform raw. thus carried on the analysis which aimed at effective, carried on the multi-resolution analysis after the signal was also suitable in the extraction signal partial characteristic. Therefore, unifies the use using wavelet transformation's. This characteristic and the coherent body technology to be able to solve in seismic data explanation many problems. This article unifies the wavelet transformation and the earthquake coherent body technology, using simulated seismic wavelet wavelet function (or high resolution derivative wavelet function) original 3d seismic records of the body first as wavelet transform and coherent processing, different quality earthquake data body selection suitable wavelet parameter and coherent processing parameter, after the debugging, obtains the desired effect, then carries on restructuring to the different frequency band's coherent body to make the restructuring coherent body. Like this carries on the explanation to the final data body to be possible to increase the precision, realizes the geologic anomaly body's fine explanation finally.This article has mainly made two aspect progresses: First, unifies the wavelet transformation and the earthquake coherent attribute parsing technique, through to parameter and so on wavelet center frequency, scale factor determinations, the selection most superior wavelet function, then carries on using the wavelet territory frequency division method the data frequency division processing, calculates a minute each quality again the coherent data body, finally carries on restructuring to the coherent data to obtain the restructuring data body, thus realizes to the crack examination recognition; Second, applies in actual seismic data processing the above method, extracts the side line section plane from the primitive three Uygur earthquake data body to conduct the processing research, carries on the contrastive analysis to each quality's data body, after selecting the most superior parameter, carries on processing, finally carries on plane slice processing to each restructuring data body, realizes the whole three Uygur material by this macroscopic and the partial processing explanation.