Method and device for predicting pore pressure of three-dimensional shale reservoir, and electronic device

Abstract

The invention provides a method and a device for predicting pore pressure of a three-dimensional shale reservoir, and an electronic device. The method comprises the steps that an overlying strata pressure and a longitudinal wave modulus of the shale reservoir in a region to be predicted are determined according to a density logging curve and a longitudinal wave velocity logging curve; the really-measured pore pressure value of the shale reservoir is taken as a constraint condition, and the longitudinal wave velocity logging curve, a shale-reservoir equivalent stress and the longitudinal wave modulus are fitted through the way of multiple linear regression to obtain fitting parameters; a wave impedance data volume, a density data volume and a longitudinal wave velocity data volume of the region to be predicted are obtained through a logging-constrained wave impedance inversion; a reservoir overlying strata pressure data volume, a longitudinal wave modulus data volume and a shale-reservoir equivalent stress data volume are further determined; and the pore pressure of the shale reservoir is determined finally. According to the device, the prediction accuracy and reliability of the pore pressure are improved, the application range is wide and the prediction results are visible.

Description

technical field [0001] The invention relates to the technical field of oil and gas geophysical exploration, in particular to a three-dimensional shale reservoir pore pressure prediction method, device and electronic equipment. Background technique [0002] Shale formation pore pressure is one of the basic data in shale gas exploration and development. Abnormal shale formation pore pressure (especially shale formation pore pressure under abnormal high pressure) will affect the formulation of mining plan, drilling fluid ratio and drilling stability, and may cause drilling accidents; abnormal shale Formation pore pressure is related to safe, fast and economical drilling, and even affects the success or failure of drilling. Therefore, the research on abnormal shale formation pressure, especially the pore pressure of shale formation under abnormal high pressure, has attracted more and more attention from the industry. [0003] In the drilling stage, predicting shale gas reservo...

AI Technical Summary

Problems solved by technology

If these factors are ignored, it will inevitably lead to wrong prediction results of reservoir pore pressure

[0005] To sum up, the current pore pressure prediction of shale gas reservoirs is mostly based on the assumption of constant compaction of mudstone, and the exponential relationship between seismic wave velocity and equivalent stress is used to predict the pore pressure of shale gas reservoirs. The prediction accuracy and reliability of shale gas reservoirs with complex structures and large buried depth changes are poor, and it is difficult to meet the requirements of accurate and reliable prediction of pore pressure in shale gas reservoirs before drilling

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