Stable attenuation compensation reverse-time migration imaging system and method in large desert area
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A technology of reverse time migration imaging and attenuation compensation, which is applied in the field of petroleum geophysical exploration, can solve the problems of difficult data acquisition, distortion and distortion, etc., and achieve the effect of correcting dispersion, reasonable design, and accurate imaging of seismic data
Active Publication Date: 2018-11-30
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Due to the strong attenuation effect caused by the loose sand dune surface, the first arrival of the collected data in the large desert area is not obvious and difficult to pick up, and the first arrival curve has a very obvious distortion due to the undulating sand ridges and dunes with hundreds of meters of height difference, so the large desert area Therefore, it is necessary to study the imaging technology for the surface of irregularly attenuated sand dunes for the data collected in large deserts.
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Embodiment 1
[0073] A stable attenuation-compensated reverse time migration imaging system in large desert area, its structure is as follows Figure 10 As shown, it includes input module, coordinate transformation module, wave field forward continuation module, wave field reverse continuation module, stabilization operator module, coordinate inverse transformation module, cross-correlation imaging module and output module;
[0074] The input module is configured to input the migration velocity model of the large desert area in the physical domain, the Q model and the actual observation shot records, and establish an observation system;
[0075] a coordinate transformation module configured to transform the migration velocity model and the Q model of the large desert region into a computational domain;
[0076] The wave field forward continuation module is configured to update the wave field by forward continuation, and obtain the forward wave field snapshot of the computational domain wave...
Embodiment 2
[0083] On the basis of the above embodiments, the present invention also mentions a stable large desert area attenuation compensation reverse time migration imaging method, the process of which is as follows figure 1 As shown, it specifically includes the following steps:
[0084] Step 1: Through the input module, input the migration velocity model, Q model and actual observation shot records of the large desert area in the physical domain, and establish the observation system;
[0085] Step 2: Transform the migration velocity model and Q model of the large desert area into the computational domain through the coordinate transformation module, using formula (1);
[0086]
[0087] Among them, (x, z) represents the coordinate expression of the physical domain; (ξ, η) represents the coordinate expression of the computational domain;
[0088] Step 3: Through the wave field forward continuation module, the wave equation is used to perform forward continuation to update the wave...
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Abstract
The invention discloses a stable attenuation compensation reverse-time migration imaging system and method in a large desert area, and belongs to the field of petroleum geophysical exploration. The stable attenuation compensation reverse-time migration imaging method comprises the steps that a migration model and shot records are input; the migration model is converted into a computational domain;a forward-propagation wave field snapshot of the wave field of the computational domain is obtained through forward extension; a reverse extension equation of the sand-dune ground surface capable ofaccurately correcting amplitude attenuation and the irregular attenuation of phase frequency dispersion is obtained, and a reverse-propagation wave field snapshot of the wave field of the computational domain is obtained; a computational domain stabilization operator is introduced to suppress high-frequency noise of reverse extension; the wave field snapshots of forward extension and reverse extension are inversely transformed to a physical domain; and an imaging result is obtained by applying physical domain zero phase cross-correlation imaging conditions, and the imaging result is output. According to the stable attenuation compensation reverse-time migration imaging system and method, the influence of the irregular sand-dune ground surface on seismic wave propagation can be accurately corrected, meanwhile, attenuation of seismic recording energy and phase frequency dispersion due to the loose sand-dune ground surface can be corrected, and the high-precision imaging results of seismic collected data in the large desert area are obtained.
Description
technical field [0001] The invention belongs to the field of petroleum geophysical exploration, and in particular relates to a stable attenuation compensation reverse time migration imaging system and method in a large desert area. Background technique [0002] The loose sand dune surface conditions and complex undulating surface structure in the large desert area bring great difficulties to the imaging of the data collected in the desert area. The loose ground surface absorbs and attenuates the seismic wave energy very strongly, so the attenuated seismic wave energy needs to be compensated during the imaging process. Due to the strong attenuation effect caused by the loose sand dune surface, the first arrival of the collected data in the large desert area is not obvious and difficult to pick up, and the first arrival curve has a very obvious distortion due to the undulating sand ridges and dunes with hundreds of meters of height difference, so the large desert area There i...
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