Method for establishing low frequency model of seismic wave impedance inversion
A model building and seismic wave technology, applied in the field of seismic wave impedance inversion low-frequency model building, can solve the problems of multiple uncertainties and different sensitivity of inversion results, achieve high longitudinal precision, improve the ability of cycle skipping problems, and improve reliability effect
Inactive Publication Date: 2017-09-19
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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However, the current existing technology usually uses the information in the full frequency band of the wave field to construct the inversion algorithm, and the information in different frequency bands in the wave field is not the same in sensitivity to the cycle-skipping problem, which leads to the inversion results still have inconsistencies. much uncertainty
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[0038] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0039] Traditional envelope inversion methods use the envelope information of the wave field to construct the objective function. The envelope of the wave field can be defined as:
[0040]
[0041] In the formula, u and E(u) are the wave field and the envelope of the wave field respectively; H(u)=u(t)*(1 / πt) is the Hilbert transform of the wave field; t represents time.
[0042] Then the objective function of envelope inversion is:
[0043]
[0044] where u cal (t, s, r, V) and u obs (t, s, r) are the calculated wave field and observed wave field where the source is located at s and the receiver is located at r; V is the velocity of the underground medium; T is the time length of the seismic wave field record.
[0045] The envelope inversion method uses the information in the full frequency band of the wave field to construct the inversion a...
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The invention relates to a method for establishing a low frequency model of seismic wave impedance inversion. The method comprises the steps of determining a filter for frequency selection based on an observation seismic record; calculating an observation wave field envelope based on the filter and the observation seismic record; establishing an objective function according to the observation wave field envelope, and using the objective function for iterative inversion to obtain the velocity of subsurface media; and according to the velocity of the subsurface media, calculating the density of the subsurface media by using an empirical formula, and then obtaining an impedance low frequency model. According to the invention, the wave field envelope is constructed by using a preferred low frequency seismic record within a certain frequency band, the objective function is established based on the envelope information, the velocity of the subsurface media is obtained by inversion, and then the impedance low frequency model is obtained; and the low frequency data are insensitive to the cycle-skipping problem so that the capability of overcoming the cycle-skipping problem is improved, can act as an initial velocity model of wave impedance inversion to make the seismic impedance inversion result better reflect the characteristics of the subsurface geological structure and reservoir lithology, and provide important basis for exploration and development.
Description
technical field [0001] The invention belongs to the field of seismic wave impedance inversion, in particular to a seismic wave impedance inversion low-frequency model establishment method for improving the reliability of seismic wave impedance inversion results. Background technique [0002] Wave impedance inversion technology is a seismic processing and interpretation technology that uses seismic data to invert formation wave impedance parameters. It combines the vertical high resolution of logging data with the horizontal continuity of seismic data and the rich The lithology and physical property information of the interface can be converted into a lithological seismic section, so that it can be directly compared with drilling and logging, and geological interpretation is performed in units of strata, which can better reflect the underground geological structure and The lithological characteristics of the reservoir provide an important basis for exploration and development...
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IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/6226
Inventor 何洋洋张金淼朱振宇翁斌高静怀姜秀娣孙文博丁继才王清振陈剑军桑淑云刘志鹏欧阳炀
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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