Low permeable sandy conglomerate stratum pressure prediction method and apparatus thereof

A technology of formation pressure and prediction method, applied in the direction of prediction, instrumentation, data processing application, etc.
CN106960264AActive Publication Date: 2017-07-18PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2017-07-18

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Abstract

An embodiment of the invention provides a low permeable sandy conglomerate stratum pressure prediction method and an apparatus thereof. The method comprises the following steps of under set pore pressure, acquiring a first longitudinal wave speed of a rock core under each assigned differential stress; under a set differential stress, acquiring a second longitudinal wave speed of the rock core under each assigned pore pressure; acquiring a first rate of change of the first longitudinal wave speed along with the differential stress under the set pore pressure; acquiring a second rate of change of the second longitudinal wave speed along with the pore pressure under the set differential stress; according to the first rate of change and the second rate of change, determining an effective stress coefficient of the rock core; and according to the effective stress coefficient of the rock core, determining stratum pressure of a reservoir stratum corresponding to the rock core. In the embodiment of the invention, low permeable sandy conglomerate stratum pressure prediction accuracy can be increased.
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Description

technical field

[0001] The present application relates to the technical field of oil and gas exploration and development, in particular to a pressure prediction method and device for low-permeability sandy conglomerate formations. Background technique

[0002] Effective stress is a basic concept of rock mechanics, first proposed by Terzaghi, who defined effective stress as the difference between the total pressure of the upper layer and the pore fluid pressure: Pd=Pc-Pp. Among them, Pd represents Terzaghi effective stress, that is, pressure difference; Pc is confining pressure; Pp is pore fluid pressure. The effective stress simplifies the two independent variables of confining pressure and pore fluid pressure into one variable, which facilitates the analysis of the properties of porous materials. Any change in physical properties caused by changes in confining pressure and pore fluid pressure can be calculated by effective stress describe. Therefore, it is of great signif...

Claims

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