Seismic and geologic integrated low-order small fault determination method and device

Abstract

The invention provides a seismic and geologic integrated low-order small fault determination method and a device. The method comprises steps: three-dimensional seismic data for prestack time migration in a study area and vertical seismic profile (VSP) data deployed throughout the whole area are acquired; according to the three-dimensional seismic data, a boundary fault in a chemical flooding block is determined, and suspected small faults inside the chemical flooding block are determined; and the VSP data are used for determining a small fault from the suspected small faults. The fault recognition precision can be improved gradually, small faults of 8 to 10m between injection and production wells during a chemical flooding development stage can be recognized and analyzed, and the existing data can be highly integrated and used high efficiently.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a method for determining small faults, and specifically to a method and device for determining small faults of low-order sequences integrated in seismic and geological processes. Background technique [0002] As we all know, oilfields generally have high water cut in the middle and late stage of exploitation. With the continuous improvement of water flooding degree, the efficiency of water flooding will be greatly reduced. The requirements are also different. [0003] In the secondary oil recovery stage, water injection in a large well section and oil production in the whole well section are adopted, and the scale of the geological body is also relatively large. Local geological disconnected bodies are not prominent in the production process and have little impact on the evaluation of the development effect. , the contradiction of partial disconnection is easy to be ignored...

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Problems solved by technology

[0006] The present invention provides a method and device for determining low-order small faults integrated in seismology and geology. Based on the three-dimensional seismic data of pre-stack time migration in the research area, fully refer to the vertical seismic profile (VSP) data deployed as a whole in the research area, and combine the single well The drilling and logging data can effectively identify and analyze the small faults of 8-10 meters between injection and production wells in the chemical flooding development stage, and solve the problem of poor implementation effect in the chemical flooding development stage in the existing technology

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