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Method for calculating formation pore fluid pressure based on rock pore structure parameters

A technology of pore structure parameters and formation pores, applied in the field of petrophysics, can solve problems such as inapplicability to complex lithologic formations, and achieve accurate calculation results

Pending Publication Date: 2022-01-14
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0004] The present invention intends to provide a calculation method of formation pore fluid pressure based on rock pore structure parameters to solve the problem that the existing method for calculating formation pore fluid pressure is not applicable to complex lithology formations

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  • Method for calculating formation pore fluid pressure based on rock pore structure parameters
  • Method for calculating formation pore fluid pressure based on rock pore structure parameters
  • Method for calculating formation pore fluid pressure based on rock pore structure parameters

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Embodiment Construction

[0045] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

[0046] refer to Figure 1 to Figure 7 , a method for calculating formation pore fluid pressure based on rock pore structure parameters, comprising the following steps:

[0047]S101: Using conventional logging data, first calculate the saturated rock bulk modulus under each logging curve point, then calculate the fluid bulk modulus of each pore fluid, and then calculate the fluid bulk modulus of the pore mixed fluid.

[0048] Conventional well logging data such as figure 2 As shown, including P-wave velocity logging curve, shear-wave velocity logging curve, density logging curve, porosity logging curve, water saturation logging curve. The longitudinal wave velocity is denoted as V P , the unit is m / s, and the shear wave velocity is expressed as V S ,, the unit is m / s, and the density is expressed as ρ sat , the unit is g / cm3, and the porosity is exp...

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Abstract

The invention belongs to the technical field of rock physics, and discloses a method for calculating formation pore fluid pressure based on rock pore structure parameters. The method comprises the following steps of: S101 calculating the volume modulus of saturated rock and pore mixed fluid; S102 calculating a matrix bulk modulus by using an adaptive inversion theory; S103 calculating a comprehensive pore structure parameter representing the pore characteristics of the rock; S104 quantitatively calculating a Biot coefficient considering a pore structure parameter; and S105 calculating the formation pore fluid pressure considering the pore structure parameters. The method solves the problem that a method for calculating the pore fluid pressure of the stratum in the prior art is not suitable for complex lithologic stratums, and is suitable for calculating the pore fluid pressure of the complex lithologic stratums.

Description

technical field [0001] The invention relates to the technical field of petrophysics, in particular to a method for calculating formation pore fluid pressure based on rock pore structure parameters. Background technique [0002] Formation pore fluid pressure is defined as any porous system. When it bears an external load, the part of the load supported by the fluid in the pores is called pore fluid pressure. Under normal circumstances, when the pore is connected to the outside world and the fluid in the pore can be discharged freely, the pore fluid pressure is equal to the hydrostatic pressure; on the contrary, when the pore is blocked from the outside world, an abnormal formation pressure is formed, and the distribution of abnormal formation pressure is oil and gas It is a common phenomenon in sedimentary basins, and effective prediction of formation pressure is of great significance for understanding the enrichment and migration of oil and gas and ensuring drilling safety. ...

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Application Information

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IPC IPC(8): G06F17/11G06F17/15G06Q50/02
CPCG06F17/11G06F17/15G06Q50/02
Inventor 周云秋贺锡雷林凯
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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