Research On Acquisition And Processing Technology Of Deep Seismic Exploration In Changling Fault Depression

There are difficulties on deep seismic exploration of Changling Fault Depression: theseismic and geological condition is complex of surface and deep, the interference wavejamming is serious, the signal-to-noise ratio of data is low, and these bring many technicalproblems to the seismic acquisition and data processing. So we should not only use previousmature technologies including combine acquisition and deep data processing technology, butalso make technical innovation to meet the demand of deep seismic exploration in Jilin.In this paper, based on previous research results, new techniques of seismic acquisition andprocessing are used in the integrated research on deep exploration of Changling FaultDepression. First, according to the complex surface conditions, the stimulating and receivingtechniques are used to improve the signal-to-noise ratio of the weak reflected signal in deep,the energy and signal-to-noise ratio of the stimulating wavelet are improved, and the absolutefrequency width of the stimulating wavelet is broaden. The interference of surface wave,refraction wave and high frequency environmental noise are also suppressed effectively, andthe signal-to-noise ratio and resolution of seismic data are improved. Truly high fidelity andhigh signal-to-noise ratio are realized, and the imaging effect of the crushing structural belt isimproved. Then, according to the fast change of the layer thickness and speed and the surfaceabnormality area without stable refraction interface, the seismic processing technologies areused, including the energy compensation technology, the prestack denoising technology, thechromatography static technology, the technology improving the deep resolution, the selectionof migration aperture and the technology against false frequency, the velocity model buildingand correction techniques and the application technology of prestack depth migration method,and the high amplitude-preserved processing and energy balance are realized, the influence oflow amplitude structure is eliminated, and the imaging precision and reliability of deep dataare improved. And the final seismic data can meet the needs of the deep seismic explanationand to the purpose of the volcanic prediction and identification, and the structure implementare reached.