Abstract
Multi-stages volcanic are available in HX area, shielding the seismic waves. Previous seismic acquisitions of large size bin, less fold coverage and narrow azimuth result in indistinct fault images, low S/N ratio and the difficulty of multi-stages volcanic characterization. In reference to the successful experience of domestic and overseas volcanic exploration, the low frequency excitation and receiving, and survey with wide range, high coverage, wide azimuth should be paid more attention, associated with two-dimensional and three-dimensional wave equation forward modeling and real data processing contrast analysis method. The image of underlying strata and fault are remarkably improved in the new method, according to the processing results of new seismic data. The new method will provide technical reference for the similar volcanic development area in the future seismic acquisition design.
Highlights
HX area is abundant of volcanic in Liaohe depression, structurally located at the south central of eastern sag of Liaohe depression
HX area developed several sets of volcanic from Es3, Es1 and Ed in the longitudinal direction, the volcanic of different layers superimposed in the plane direction, and its uneven distribution
Low-frequency vibroseis is chosen, the low frequency information of low frequency is rich, which will improve the ability of penetrating volcanic, improve the form of correlative wavelet, extend the spectrum of seismic data, and improve resolution of the seismic data, which become an important tool to break bottlenecks of the volcanic
Summary
HX area is abundant of volcanic in Liaohe depression, structurally located at the south central of eastern sag of Liaohe depression. An Xueyong [9] and Zhao Jianzhang [10] put forward the suggestion of seismic acquisition survey parameters in view of the problems of the development of the surface layer and the superficial layer She Deping [11] [12] using wave equation wave field numeric simulation technique, showed the low frequency signals having strong capacity both penetrating thin shielding high velocity basalt and reducing diffraction noises produced from rough surface, improving the imaging quality of deep beds below the shielding layer through using low frequency. By analyzing and processing actual data of HX region, the wide azimuth purpose is put forward (4000 m target layer to be full azimuth), high fold, small bin size, big offset survey, using low frequency vibrator to achieve broad band shooting, and realize “Two Wide and One High” acquisition. Through data processing and interpretation, we achieve good results which effectively improve the imaging of underlying strata and fracture
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