Phase-controlled earthquake inversion method in geophysical exploration

Abstract

The invention provides a phase-controlled earthquake inversion method in geophysical exploration, and belongs to the field of petroleum geophysical prospection. The method comprises the following steps: obtaining a three-dimensional surge impedance data volume step from inversion of original earthquake data; conducting phase control on the earthquake inversion step. The method utilizes earthquake data and a logging surge impedance curve to conduct inversion to obtain surge impedance data of a reservoir stratum under the control of result of an earthquake phase and a geologic phase, can maintain horizontal resolution while improving vertical resolution, and can finely depict space spreading and distributing form of the reservoir stratum.

Description

technical field [0001] The invention belongs to the field of petroleum geophysical exploration, and in particular relates to a phase-controlled seismic inversion method in geophysical exploration. Background technique [0002] In petroleum exploration and development, the main task in the exploration stage is to find some large traps for the structures and fault-block oil and gas reservoirs that are easy to be found. With the in-depth development of oilfields, the old oilfields have gradually shifted from the exploration stage to the development stage, and the research target has also shifted to lithologic reservoirs dominated by lithological factors. On the whole, they have developed from the discovery of structural reservoirs to lithologic reservoirs. [0003] At the stage of lithology exploration, how to fully apply the rich information contained in various geophysical data to analyze the development of underground formations, and then identify the spatial changes of rese...

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Problems solved by technology

[0006] The existing model-based seismic inversion technology and seismic facies analysis technology have their own defects: the model-based seismic inversion technology only uses the seismic interpretation horizon as the constrained layer in the modeling process, and the properties of the logging curve along the horizon The spatial interpolation and extrapolation did not take into account the spatial variation of the geological body. Although the vertical resolution of the inverted data volume has been improved, there are artifacts in the boundary of the sand body.

Seismic facies analysis technology mainly uses the changes of seismic waveforms to describe the plane distribution of geological bodies. This technology can comprehensively log and match geological facies, and clearly describe the spatial distribution of reservoirs and reservoir boundaries, but it cannot accurately describe the distribution of thin reservoirs. to identify

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