Seismic Wave's Absorption Characteristic And Application Studies

When seismic waves travel through the earth, amplitude will be attenuated and the phase will be distorted because of the unelasticity of the media. The phase of the earth filtering is a complicated problem. Based on the Futterman amplitude and phase velocity dispersion pair, the relationship of Q-factor and the attenuation factorαis discussed. Non-elasticity attenuation principle is formulated during the seismic waves traveling. Using the Hargreave wave equation exact solutions, synthetic records with attenuation and dispersion are made, but calcuated amout is large. Modified Hale algorithm is adopted for deconvolution computation of the target signal and the deconvolution filtering factors. Computing velocity of this algorithm is quick and the effect is good as well.Seismic records with absorption of the forward modeling seismic exploration is an important means of processing and interpretation, but his methods are commonly used as ray tracing, wave equation forward simulation, and so on, do not take into account the absorption of underground media . The actual formation viscoelastic medium is the non-uniform, as wave-front-proliferation, formation absorption and scattering, and other factors, makes the seismic wave propagation and to withstand the frequency attenuation and dispersion arising from the phase distortion, and energy transmission distance with the increase And the rapid decay. Especially in the deep strata, high-frequency seismic waves, particularly elements decay, lower-resolution, seismic-wave spectrum amplitude and phase of the spectrum have a serious distortion. Absorption forward modeling underground medium on the absorption of seismic wave data processing is the key to improving its accuracy seismic imaging, inversion of the right to physical attributes, and underground media in the fluid reservoir identification is of paramount importance. Is the follow-up inspection frequency attenuation attributes of an effective way to correct algorithm. With the constant seismic exploration technology to develop and improve the spectrum of technology has become the use of seismic information to detect hydrocarbons one of the important means, and how to seismic data of the transformation to the time domain frequency domain, the government is based on the analysis of the spectrum , Is also affected oil and gas detection and reliability of the key technology areas. Attenuation frequency spectrum analysis, in an important attribute characteristics. Attenuation of seismic wave that when the underground media in the dissemination of the total energy loss is the medium inherent attributes. Seismic waves caused attenuation factor is the medium of solid and solid, solid and fluid, fluid and the fluid interface between the depletion of energy. Theoretical study and practical application of that, in geological body, if the porosity development, filling oil, gas and water (oil and gas for the gas-bearing), seismic reflection absorption increased, high-frequency attenuation intensified, oil and gas formation comparable absorption coefficient The same lithology non-oil and gas formation of a high order of magnitude or even several times. Research and Application of that, in the attributes of the frequency, frequency attenuation is a gradient of hydrocarbon reflect more sensitive properties. As seismic signals in the frequency components with time to change, how to achieve one time, frequency and location. And the use of spectrum signals in the frequency of which signal to extract the study attributes of great significance.Attenuation frequency spectrum analysis, in an important attribute characteristics. Attenuation of seismic wave that when the underground media in the dissemination of the total energy loss is the medium inherent attributes. Seismic waves caused attenuation factor is the medium of solid and solid, solid and fluid, fluid and the fluid interface between the depletion of energy. Theoretical study and practical application of that, in geological body, if the porosity development, filling oil, gas and water (oil and gas for the gas-bearing), seismic reflection absorption increased, high-frequency attenuation intensified, oil and gas formation comparable absorption coefficient The same lithology non-oil and gas formation of a high order of magnitude or even several times. Research and Application of that, in the attributes of the frequency, frequency attenuation is a gradient of hydrocarbon reflect more sensitive properties.Attribution analysis changes quantitative seismic attribution into reservoir characteristic by use of attribution demarcation. The most important in seismic attribution demarcation is to understand and identify the attribution of stable statistics characteristic that can reflect geologic and physical significance. Study indicate, compared with the fine rock matrix, when rockmatrix is filled with fluid,such as water, oil or spirits,the seismic wave dispersive and energy will attenuate. The attenuation of spirit is quickly than solid,the sandstone containing spirit is the most quickly.Through the forward of a separate contain gas, oil, water and dry the four layers of the geological record of the conceptual model, and its corresponding spectrum analysis of seismic records, the total energy analysis and research. When the layer is thicker, it can be seen: time-frequency analysis method and time Window parameters of choice should be determined according to different conditions, so as to achieve the best effect; decay gradient attributes and the total energy properties have a certain similarity, with the using of frequency attenuation gradient attributes of geological data, can be used to analyze these factors as the existence and decay Distribution, oil and gas reservoirs can provide a good reference forecast. At the same time, with the two work area of the actual data decay gradient properties and attributes of the total energy calculation and comparison, the theoretical analysis of the results has been verified.