Determination method of optimal weathered layer speed
A determination method and regolith technology, applied in the field of petroleum exploration, can solve the problems of low static correction accuracy, inability to accurately obtain regolith velocity, and inability to accurately determine near-surface information in advance, and achieve the effect of improving accuracy.
Active Publication Date: 2012-10-24
新锦动力集团股份有限公司
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[0004] The problem to be solved by the embodiments of the present invention is to provide a method for determining the optimal regolith velocity, which solves the problem that the near-surface information in complex areas cannot be accurately determined in advance, so that the regolith velocity cannot be accurately obtained, resulting in low accuracy of subsequent static corrections The problem
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[0020] Such as figure 1 Shown is a schematic flow chart of a method for determining a preferred regolith velocity of the present invention, comprising the following steps:
[0021] Step S101: Preset representative regolith velocity v 0 ; The preset represents the regolith velocity v 0 Any value between 750 m / s and 850 m / s can be selected, for example: 800 m / s.
[0022] Step S102: According to the preset representative regolith velocity v 0 Obtain the actual regolith velocity change interval, the specific process is as follows;
[0023] 1) According to the remaining static correction value δt and the boundary range value of the intercept time t, the remaining static correction value δt and the intercept time t are determined. In the actual geological environment, in order to make the remaining static correction It can be eliminated in the static correction process, and the absolute value of the specific boundary range of the remaining static correction value δt usually does ...
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The embodiment of the invention discloses a determination method of an optimal weathered layer speed, which specifically comprises: a representative weathered layer speed value is preset, the static correction value caused by the representative weathered layer speed value and the actual weathered layer speed difference under the condition that the weathered layer thickness is not less than 300 meters can be completely limited in the range allowed by the subsequent residual static correction programs, and then the establishment of a near surface model can acquire a stable solution. Therefore, in the static correction process of refracted waves, near surface surveys such as micro-logging and the like are not required to be performed in advance, and then the accuracy of static correction of refracted waves with short wavelength and long wavelength for structural imaging in complex areas can be improved.
Description
technical field [0001] The invention relates to the field of petroleum exploration and is applied in the process of seismic data processing, in particular to a method for determining the velocity of an optimal regolith. Background technique [0002] In the theory of seismic exploration interpretation in the prior art, it is generally assumed that the excitation point and the receiving point are on the same horizontal plane, and the formation velocity is uniform. But in fact, the ground is often uneven, the depth of each excitation point may be different, and the wave speed in the low-velocity zone is very different from that in the formation, so it will definitely affect the shape of the measured time-distance curve. In order to eliminate these influences, topographic correction, excitation depth correction, and low-velocity zone correction must be performed on the original seismic data. Since these corrections are invariant to different seismic interfaces at the same obser...
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IPC IPC(8): G01V1/36
Inventor 吴媚欧阳行艳王顺根孙庚文谢桂生
Owner 新锦动力集团股份有限公司