Method for improving seismic data resolution ratio for well control

Abstract

The invention provides a method for improving a seismic data resolution ratio for well control. The method for improving the seismic data resolution ratio for well control comprises the steps of calculating reflection coefficients at all well positions; calculating deconvolution operators at all well positions according to reflection coefficients at all well positions; conducting reverse distance weighted three-dimensional spatial interpolation on all deconvolution operators to obtain deconvolution operators of all seismic traces in a three-dimensional space; and conducting convolution processing on original seismic trace data according to deconvolution operators of all seismic traces, and obtaining three-dimensional data volumes through phase correction and trace equalization. The method for improving the seismic data resolution ratio for well control solves the problems that seismic data in the prior art are low in resolution ratio and high in limitation of application range, and the method has the advantages that a plurality of weakened horizon information is strengthened, information of structures such as faults is clear and the superimposing relationship of horizons is clear and accurate.

Description

technical field [0001] The invention relates to the field of petroleum geophysical exploration and development, in particular to a method for improving the vertical resolution of ground three-dimensional seismic data through the control of well data. Background technique [0002] Improving the resolution of surface seismic data has always been a hot and difficult research topic at home and abroad. It has great theoretical and practical value in oilfield exploration and development. The difficulties in improving the resolution of seismic data mainly include the following two aspects: First, improving the resolution is only a means to improve the understanding of stratigraphic characteristics, so the rationality and reliability of the technology for improving the resolution must first be ensured; Resolution and signal-to-noise ratio are a pair of contradictions that are difficult to reconcile, and the improvement of seismic data resolution also means that the energy of low-fr...

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Problems solved by technology

Conventional deconvolution technology for improving resolution is generally the use of single seismic data information, which lacks robustness and three-dimensional space adaptability in the calculation of deconvolution operators, and is greatly restricted in application

In the Chinese patent application with the application number of 200710017029.0, the inventor of this case proposed a combination of cross-well seismic data and surface seismic data, based on the system identification method to estimate the absorption and attenuation characteristics of the formation for seismic waves, and to improve the seismic wave absorption and attenuation characteristics through high-frequency compensation. The resolution method of surface seismic data, but cross-well seismic data is less in oilfield exploration and development areas, and has great limitations in application

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