Method for identifying lithologic reservoir under strong impedance shielding by applying wavelet decomposition and reconstruction technology

Abstract

The invention discloses a method for identifying a lithologic reservoir under strong impedance shielding by applying a wavelet decomposition and reconstruction technology, and belongs to the technical field of reservoir prediction. The method comprises the steps of firstly performing synthetic record production on a drilled well within a block, and completing fine reservoir calibration; implementing drilled well conditions such as the reservoir thickness under strong impedance shielding, simulating seismic reflection generated by a target reservoir and lithological combinations above the below the target reservoir by applying a desanding test based on petrophysical analysis, and analyzing geologic structure features reflected by a strong impedance reflection event according to characteristics of a generated seismic response; then screening wavelets, optimizing parameters to reconstruct a new seismic channel, and acquiring a seismic data volume after decomposition and reconstruction of the wavelets; and performing horizon tracing interpretation on the basis, extracting various attributes such as the horizon-oriented amplitude, and completing reservoir prediction. The method solves a problem of reservoir prediction under seismic strong wave impedance shielding by applying a wavelet decomposition and reconstruction technology, and provides a basis for identification, exploration and development deployment for the kind of lithologic reservoirs.

Description

technical field [0001] The invention relates to a method for identifying lithologic oil reservoirs under strong impedance shielding by applying wavelet decomposition and reconstruction technology, and belongs to the technical field of reservoir prediction. Background technique [0002] Lithologic mutations caused by geological events, lack of strata or the influence of depositional environment are usually characterized by high wave impedance in the seismic section, such as unconformities or strata with developed coal seams. However, the reservoir near the strong wave impedance interface is often affected by it and cannot be identified. This phenomenon is often encountered in the process of oilfield exploration and development. Moreover, the prediction difficulties of such complex reservoirs often restrict the discovery of this type of lithologic reservoirs. [0003] How to remove the strong impedance background and identify the reservoir affected by its shielding is a very ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method of using wavelet decomposition and reconstruction technology to identify lithologic reservoirs under strong impedance shielding, so as to solve the problem of inaccurate prediction of reservoirs using original seismic data attributes in the identification process of such lithologic reservoirs

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