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Well control Q compensation method

A compensation method and logging technology, which are applied in the fields of seismology and seismic signal processing for logging records, and can solve the problem that the Q value in the Q compensation method is difficult to be accurate.

Active Publication Date: 2020-04-24
恒泰艾普(北京)能源科技研究院有限公司
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Problems solved by technology

[0005] In order to solve the problem that the Q value is difficult to be accurate in the Q compensation method, the present invention proposes a well control Q compensation method, which forms the whole work area velocity quality control grid points through the velocity function provided by the well logging + VSP well, and constrains the seismic data velocity , and then form an equivalent Q field, the obtained Q field is more accurate, which can effectively improve the effect of Q compensation

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Embodiment Construction

[0052] Below in conjunction with accompanying drawing, technical scheme of the present invention will be further described:

[0053] A well control Q compensation method, such as figure 1 As shown, it specifically includes the following steps:

[0054]S1. Obtain well logging data, VSP well data and seismic data, and manually pick up surface seismic velocity according to the seismic data. Drill wells in the work area and obtain well logging data and VSP data. Among them, the well logging data mainly include the coordinates of the well logging points, the measured depth, the vertical depth and the sound wave, and the coordinates of the well logging points are the geodetic coordinates of the logging , the measured depth is the well depth, and the vertical depth is the vertical depth from the wellhead to the bottom of the well. When drilling vertically, the measured depth is the same as the vertical depth. When drilling obliquely, the measured depth is the actual length of the we...

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Abstract

The invention provides a well control Q compensation method which comprises the following steps: S1, acquiring logging data, VSP well data and seismic data, and manually picking up ground seismic velocity according to the seismic data; S2, calculating a logging root-mean-square speed and a VSP well root-mean-square speed to obtain a root-mean-square speed set; S3, obtaining well point positions ofthe logging well and the VSP well in the work area; S4, constraining the speed value of the ground seismic speed based on the root-mean-square speed set; S5, converting the constrained ground seismicvelocity into an interval velocity by using a DIX formula; and S6, converting the interval velocity into a Q field by using a Li Qingzhong's empirical formula, and completing seismic wave compensation by using the Q field. The Q field obtained through the method is more accurate, and the Q compensation effect can be effectively improved.

Description

technical field [0001] The invention relates to a Q compensation method based on well logging and VSP well data, and belongs to the technical field of seismic wave energy compensation. Background technique [0002] Part of the elastic potential energy is converted into thermal energy and dissipated during the propagation of seismic waves, resulting in the attenuation of seismic wave energy, and the higher the frequency of seismic waves, the faster the attenuation. The attenuation of the seismic wave not only reduces the amplitude of the seismic wave, but also distorts the waveform of the seismic wave, resulting in a decrease in the signal-to-noise ratio and resolution of the seismic data. [0003] Inverse Q filtering is a technique to compensate for the attenuation effect of ground absorption. It can not only compensate for amplitude attenuation and frequency loss, but also improve the phase characteristics of the record, thereby improving the continuity of the event and inc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/48G01V1/50
CPCG01V1/48G01V1/50
Inventor 张丽孙波魏雄辉陈卫锋张梅华
Owner 恒泰艾普(北京)能源科技研究院有限公司
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