High-accuracy depth domain stochastic simulation inversion method suitable for designing track of horizontal well

Abstract

The invention relates to a high-accuracy depth domain stochastic simulation inversion method suitable for designing a track of a horizontal well, which comprises the following steps: firstly, selecting typical wells according to a certain proportion to carry out calibration of a synthetic record; establishing solid models for the typical wells and repeatedly carrying out calibration fine adjustment by stratigraphic correlation; generating a time domain sparse impulse wave impedance data volume and establishing a well control velocity field; carrying out time-to-depth conversion on the obtained time domain sparse impulse wave impedance data volume; and using depth domain sparse impulse wave impedance data as a restriction and ensuring all the wells to participate in the depth domain stochastic simulation inversion, so that an inversion result can be used for designing the track of the horizontal well. According to the invention, only the typical wells need to be subjected to calibration of the synthetic record; and by carrying out comparison and analysis on a logging curve and the high-accuracy solid models, carrying out fine adjustment and calibration, establishing the well control velocity field and directly utilizing absolute depth information of the wells to carry out depth domain stochastic simulation restrained inversion, a calibration error of a non-typical well is absolutely eliminated and the depth prediction accuracy of a target layer aiming at the track of the horizontal well is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of reservoir prediction, and relates to a high-precision reservoir prediction and depth-domain stochastic simulation inversion method suitable for horizontal well trajectory design. Background technique [0002] During the deployment of horizontal wells, accurate prediction of reservoirs and the accurate burial depth of reservoirs in the ground are the fundamental basis for the design of horizontal well trajectories. Since logging data is in the depth domain and seismic data is in the time domain, technicians are required to calibrate all completed wells in the study area to clarify the relative relationship between time and depth before inversion prediction and trajectory design can be performed. Since the resolution of seismic data is much lower than that of well logging, the time-depth calibration between well logging and seismic data cannot be absolutely accurate, and human error cannot be eliminated. W...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-precision depth domain stochastic simulation inversion method suitable for horizontal well trajectory design, so as to solve the problem that the depth prediction error of the existing method is large and the logging data of the pilot hole section of the horizontal well or the A target point cannot be obtained Effective use of the problem

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