A seismic inversion method and device

Abstract

The invention discloses a seismic inversion method and device, comprising: judging that the inversion is feasible according to the wave impedance curves of all the wells drilled in the research block, and obtaining the wave impedance values ​​of the while-drilling points during the logging-while-drilling process; According to the wave impedance curve and the wave impedance value of the point while drilling, the wave impedance probability distribution curve of the research block is calculated; the inversion result is obtained according to the wave impedance probability distribution curve; the wave impedance value of the next point while drilling is obtained, and the statistical research is continued Probability distribution curve of wave impedance of the block until the drilling process is completed. The invention can improve the inversion precision. Furthermore, the well inclination angle is adjusted according to the inversion results, which improves the reservoir drilling rate of horizontal wells.

Description

technical field [0001] The invention relates to the technical field of geosteering, in particular to a seismic inversion method and device. Background technique [0002] Seismic inversion refers to the process of imaging the spatial structure and physical properties of underground strata by using seismic data from surface observations and constrained by known geological laws and drilling and logging data. [0003] Existing seismic inversion methods include post-stack sparse pulse seismic inversion technology, conventional logging-while-drilling (LWD, Logging While Drilling) measurement curve change trend discrimination method, resistivity inversion edge-detection built-in logging-while-drilling tool and density imaging techniques. [0004] In the existing inversion methods, for example, post-stack sparse pulse seismic inversion technology, because the inversion technology relies on seismic pure wave data, and the seismic pure wave data with low signal-to-noise ratio will le...

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Problems solved by technology

[0004] In the existing inversion methods, for example, post-stack sparse pulse seismic inversion technology, because the inversion technology relies on seismic pure wave data, and the seismic pure wave data with low signal-to-noise ratio will lead to large errors in seismic inversion results. large, causing misjudgment of formation prediction, and the seismic pure wave data is limited to the seismic frequency band, the vertical resolution of the reservoir is low, and the lateral physical property change of the thin reservoir cannot be accurately predicted

For example, the mudstone layer is only about 2 meters, and the post-stack sparse pulse seismic inversion technology cannot identify the mudstone layer due to the accuracy limitation

Since the wellbore trajectory cannot touch the mudstone layer, if the inversion method used cannot identify the mudstone layer, it is difficult to ensure that the wellbore trajectory does not touch the mudstone layer

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