Method and device for determining three-dimensional stratum pore pressure of target area

Abstract

The embodiment of the invention provides a method and device for determining the three-dimensional stratum pore pressure of a target area. The method comprises the steps that 1, the first incidence relation corresponding to the normal compaction trend speed is determined by combining the Philip algorithm with the Eaton algorithm; 2, a three-dimensional speed body and a three-dimensional density body are obtained on the basis of low-frequency initial model inversion of the target area; 3, the longitudinal wave speed, the stratum speed, the overlying stratum pressure and the hydrostatic pressure of the target area are determined according to the three-dimensional speed body and the three-dimensional density body; 4, the normal compaction trend speed of the target area is worked out on the basis of the first incidence relation as well as the longitudinal wave speed, the stratum speed, the overlying stratum pressure and the hydrostatic pressure of the target area; 5, the Eaton index is determined through the single well drilling measured data of the target area; and 6, the three-dimensional stratum pore pressure of the target area is determined on the basis of the Eaton algorithm and the normal compaction trend speed of the target area. According to the technical scheme provided by the embodiment of the invention, the prediction precision of the stratum pore pressure can be improved, and data support is provided for oil-gas exploration work and data interpretation work.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to a method and a device for determining three-dimensional formation pore pressure in a target area. Background technique [0002] Formation pore pressure refers to the pressure acting on fluid (oil, gas and water) in rock pores, and is one of the basic data in petroleum exploration and development. Formation pore pressure can not only provide reference data for drilling engineering, which is related to drilling safety, but also bring more abundant data for seismic data interpretation, which can help oil and gas exploration and data interpretation. Accurate prediction of formation pore pressure and study of distribution rules are of great significance to oil and gas exploration and development. [0003] In the prior art, seismic data are generally used to determine formation pore pressure. Specifically, for example, the relationship between the formation velocity a...

AI Technical Summary

Problems solved by technology

Specifically, for example, the relationship between the formation velocity and the formation pore pressure can be used to determine the formation pore pressure, but it is difficult to guarantee the accuracy of the formation velocity in practical applications, and the relationship between the formation velocity and the formation pore pressure is not linear, so it cannot be accurately determined Formation pore pressure

In the prior art, the normal compaction trend can also be used to determine the formation pore pressure, but in this method, due to the complex conditions of the shallow layer and regional lateral changes, it is often very difficult to establish the normal compaction trend, and in fact the normal There is no general law in the shape of real trends

Therefore, the existing methods for determining the formation pore pressure have their own scope of application and application prerequisites, and are limited by various data such as well logging and seismic data, so it is impossible to determine the accurate formation pore pressure

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