Post-stack amplitude compensation method of seismic attributes
An amplitude compensation, seismic attribute technology, applied in the fields of oil, natural gas, seismic exploration and development, can solve problems such as the proportion of influence
Active Publication Date: 2017-04-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
The seismic amplitude information of the exploration target layer is interfered by interlayer multiple waves generated by multiple sets of coal seams, which affects the proportion of real stratigraphic information reflected by seismic attributes. At present, there is no effective means to completely suppress the interlayer multiple waves of coal seams
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[0032] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
[0033] Because the reflection coefficient of the coal seam is too strong, interlayer reflection waves with multiple reflections will be formed between several sets of coal seams during the transmission of seismic waves. The primary reflected wave is similar, resulting in the superposition and interference of the multiple wave and the primary effective wave. The interference is divided into two parts, one is the interference of the multiple ...
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The invention relates to a post-stack amplitude compensation method of seismic attributes. The method comprises: amplitude data are extracted from post-stack seismic data; a mean-square-root amplitude or absolute amplitude A of an attribute point is obtained, wherein the A is expressed by a formula 1, x and y in the formula 1 express plane coordinates of the attribute point and z expresses an amplitude value at the coordinates x and y; paleostructure in coal seam deposition is recovered, a relative elevation difference H ' is calculated based on the paleostructure, wherein the H ' is expressed by a formula 2, h in the formula 2 expresses an elevation value at the coordinates x and y and C expresses an elevation difference value of the paleostructure; a crossed analysis is carried out on the mean-square-root amplitude or absolute amplitude A of the attribute point and the relative elevation difference H ' to obtain a correction function F(H ') related to a relationship between the amplitude and the relative elevation difference; and on the basis of the correction function F(H ') and the amplitude A, amplitude compensation is carried out. According to the amplitude compensation method, the paleostructure condition as the key factor of coal seam development is taken into consideration; and thus amplitude attribute distortion caused by coal seam multiple waves due to the coal seam can be suppressed.
Description
technical field [0001] The disclosure relates to the fields of petroleum, natural gas, and seismic exploration and development, and in particular to a seismic attribute post-stack amplitude compensation method for coal seam multiple wave interference. Background technique [0002] From the perspective of applied geophysics, the definition of seismic attributes is a subset of seismic data that reflects different geological information, and it is a seismic feature quantity that describes and describes geological information such as stratigraphic structure, lithology, and physical properties. The research on seismic attributes started in the 1960s and went through the stages of qualitative descriptive analysis and quantitative extraction. After the 1990s, multidimensional attributes represented by coherence, dip, and azimuth appeared. [0003] Domestically, seismic attributes can be divided into: (1) types of seismic attributes based on kinematics and dynamics, including amplit...
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Inventor 王猛罗延郑连弟毛凌郑四连
Owner CHINA PETROLEUM & CHEM CORP