Research On Seismic Data Processing In Dibei Complex Mountain Region And Its Interpretation Application Effect

In this paper, in view of the complex structure in Dibei region, first of all, itdetailed analyse the original seismic data of the area to grasp its characteristics in theaspects of static correction, energy, frequency and interference wave, so as to takeappropriate technical measures in processing to improve the quality of seismic dataprocessing. In the process, it actively carry out the research in the aspects of staticcorrection, noise elimination, migration and tectonic modeling, reprocessing theseismic data, in order to improve the signal-noise ratio, tapping the potential of the olddata and providing the basic data for Zone Research. On this basis, it used thetechniques of integrated calibration and tectonic modeling to fine interpret seismic dataand accurately depict the characteristics and distribution of the fault. So itreinvestigated the tectonic characteristics of yiqikelike structure and Dibei slope belt.This paper has made the following conclusion:(1) The surface structure in Dibei is complex, the problem of static correction isserious, the time of acquisition is not the same, datum is not uniform and the stratum isnot closed between the lines. We researched the techniques of the static correction, itsbasic principle based on the different datum static correction method, the applicableconditions and the effect. So we think the pseudo3D refraction static method couldsolve the misclosure between the lines. Based on this, we choose a good in elevationstatic correction, pseudo3D refraction static correction and esmodel refraction staticcorrection to solve the problem of long wavelength static correction. By comprehensiveapplication of static correction technology, we have eliminated the static correctionproblem caused by the surface structure and improved the imaging precision of seismicdata.(2) In Dibei mountain, linear interference and random noise are severe.Combination of multi-domain, multi-method and multi-system was used in the processand we have formed the interference suppression technology. The Geoeast system havethe module of High-energy interference suppression and linear interference suppression.The Omega system have the module of abnormal energy attenuation and F-k filter.They could better suppress linear interference and abnormal energy in Dibei area, improve the signal-to-noise ratio and the quality of the seismic section.(3) The geological structure is complex, accurate imaging and migration aredifficult. It fine analysed the velocity and adjusted the parameters of the removal, westudied the prestack imaging technology in complex structure and found methods toimprove the imaging accuracy in complex area and further improve the locationaccuracy. Through the application of prestack depth migration, the location was morereasonable, structure was more clearly, it effectively solved the imaging problem incomplex structure area.(4) The structure model in Dibei area is complex, it made full use of the existingresearch results, using the stack section and the migration section to interpret thestructure, combining with geology and seismic data to establish model, and describedthe characteristics and distribution of the fault.(5) Dibei1structure is a typical faulted nose structure. The structure of JurassicAbe Formation is clear, north and south back dump obviously, the characteristic is lowsouth and north high. It was mainly controlled by the northern fault sealing and formeda faulted nose structure. In the south it gradually transitions to the Dina1structure andin the north its fault block uplifts to form yiqikelike anticline. The Dibei1gas reservoiris low in the south and high in the north, narrow from north to south and long from eastto west.(6) It has basicly confirmed the Dibei2and Dibei3structure. Dibei2structure islocated in the lower of the yiqikelike western structure, extending westward Dibei slopebel. The structure in upper surface of Jurassic Abe Formation is the sww-nee trendingfaulted anticline and the autogenetic trap was developed in its high position,which hastwo structural highs. By the comprehensive analysis and study, we think Dibei2structures is a favorable exploration target.