A Method of Combining Well Logging Velocity and Seismic Velocity to Establish Three-Dimensional Velocity Field
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A logging velocity and velocity field technology, applied in the field of petroleum exploration and seismic exploration, can solve problems such as unfavorable exploration and development, high accuracy requirements of geological stratification, errors, etc.
What is AI technical title?
AI technical title is built by PatSnap AI team. It summarizes the technical point description of the patent document.
A logging velocity and velocity field technology, applied in the field of petroleum exploration and seismic exploration, can solve problems such as unfavorable exploration and development, high accuracy requirements of geological stratification, errors, etc.
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[0026] 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.
[0027] The present invention proposes a method for correcting seismic velocity in a three-dimensional region by using logging velocity. Firstly, the pseudo-well velocity curve is extracted from the seismic velocity body along the well track, and compared with the logging velocity to obtain a residual velocity curve. A residual velocity volume is obtained by interpolation under grid constraints, and the seismic velocity is corrected using the...
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Abstract
The invention provides a method for combining the logging velocity and the seismic velocity to establish the three-dimensional velocity field. The method comprises steps that the pseudo well velocitycurve is extracted from the seismic velocity body along the well trajectory; the residual velocity curve is obtained by comparing the pseudo well velocity curve with the logging velocity curve; the residual velocity curve is utilized for interpolation under the geological framework constraints to obtain the residual velocity field; the residual velocity field is utilized to correct the seismic velocity. The method is advantaged in that not only can the method be suitable for areas with relatively low exploration degrees, but also is suitable for areas with relatively high exploration degrees,with increase of the exploration degree and increase of the well number, precision is gradually improved; the transverse seismic velocity resolution and the vertical logging velocity resolution are combined to obtain the more accurate velocity field; problems of complexity of the underground structure and severe stratum velocity transverse variation of research areas can be solved.
Description
technical field [0001] The invention belongs to the field of seismic exploration, and in particular relates to a method for establishing a three-dimensional velocity field by combining logging velocity and seismic velocity, which is mainly used for seismic data processing and interpretation in the field of petroleum exploration. Background technique [0002] Seismic exploration is currently a commonly used method to find oil. It uses artificial excitation to generate seismic waves that propagate underground, and when they encounter different rock layers, they are reflected back and received by surface geophones to form seismic records. The seismic records can be processed and interpreted. Infer the nature and morphology of subsurface rock formations. Since the seismic records are in the time domain, and the drilling wells used to extract oil are in the depth domain, a velocity field is needed to link the two. Speed ​​prediction has always been one of the difficult problems ...
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