Time-shifting-logging-based method for building initial model with seismic facies constraint

Abstract

The invention relates to a time-shifting-logging-based method for building an initial model with a seismic facies constraint. The method comprises: well seismic calibration is carried out by using an interpreting layer and data after time-shifting logging, a seismic spatial relation is established by combining seismic data, and a consistency analysis is carried out on a well seismic calibration result and the seismic spatial relation; a seismic data isochronal stratigraphic frame is established by using the interpreting layer and data after time-shifting logging, wherein the seismic data isochronal stratigraphic frame is established by carrying out guiding and tracking by using an inclination angle obtained by seismic calculation and subdividing a small layer; and on the constraint of the isochronal stratigraphic frame, interpolation is carried out by using the calibrated logging data and the seismic spatial relation to obtain an initial model. According to the invention, deposition distribution cab be reflected well and the basis can be established well for better and accurate inversion.

Description

technical field [0001] The invention relates to the fields of well logging and seismic comprehensive research of oilfield development, in particular to a method for constructing an initial model based on seismic phase constraints of time-lapse logging. Background technique [0002] The key to the inversion is the establishment of the constraint model, the selection of wavelets, the selection of constraints and quality control parameters. In addition to establishing a reasonable constraint model and extracting reasonable wavelets, in the inversion process, the elastic impedance trend hard constraints of multiple wells, the control of the geological structure frame model and the soft constraints of seismic data are added. The soft constraints mainly control For lateral changes, the hard constraints of logging data control the vertical changes. The model-based seismic inversion method reasonably supplements high-frequency information and complete low-frequency components in we...

AI Technical Summary

Problems solved by technology

Until now, the sedimentary distribution of the whole area is obtained by interpolation using well logging data. Due to the complexity of the underground structure and the weak lateral prediction ability of the logging data, multi-solutions are prone to occur in the interpolation process, and the superimposition of sedimentation cannot be determined. very accurate judgment

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