Carbonate rock weathering crust karst reservoir thickness earthquake prediction method and device

Abstract

The invention provides a carbonate rock weathering crust karst reservoir thickness earthquake prediction method and device; the method comprises the following steps: obtaining earthquake data and logging data; making statistics of an average wave impedance value of a cap rock, a carbonate rock stratum and a karst reservoir layer; building a wedge shape karst reservoir layer wave impedance model; synthetizing an earthquake forward modeling profile of the wave impedance model; extracting earthquake attributes of the earthquake forward modeling profile along the weathering crust top surface, andcarrying out polynomial fitting for the earthquake attributes and the reservoir thickness; extracting the horizon earthquake attributes and predicting the reservoir thickness. The method can fully utilize the earthquake attribute information, thus improving the karst reservoir transverse prediction precision; the method uses the earthquake forward modeling of reservoirs of different thickness to build a quantification transition relation between the reservoir thickness and the earthquake attributes, thus guiding the actual earthquake data for reservoir thickness predictions, and realizing thefavorable karst reservoir growth zone quantification predictions.

Description

technical field [0001] The invention belongs to the technical field of seismic exploration, and relates to a seismic prediction method and device for the thickness of a carbonate weathering crust karst reservoir. Background technique [0002] Paleokarsts in deep marine carbonate rocks are widely developed in China and are one of the main gas-producing layers. However, karst reservoirs have strong heterogeneity, and the degree of karst development sometimes varies greatly at close distances, reflecting rapid lateral changes in reservoirs. Strong reservoir heterogeneity largely limits the exploration of karst oil and gas reservoirs. Currently, the prediction of karst reservoirs is a difficult problem in the exploration of carbonate karst oil and gas reservoirs. [0003] Early karst reservoir predictions were mostly based on structures and faults, and the correlation between structures and karsts was used for reservoir prediction. In recent years, seismic facies interpretatio...

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Problems solved by technology

[0004] Based on the disadvantages of quantitative prediction of karst reservoirs and strong multi-solution in the above-mentioned prior art, the object of the present invention is to provide a method and device for seismic prediction of the thickness of karst reservoirs in carbonate rock weathering crust

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