Sand shale rock reservoir stratum pressure earthquake prediction method and device

A formation pressure and earthquake prediction technology, which is applied in the field of earthquake prediction of sandstone reservoir formation pressure, can solve the problems of low prediction accuracy and single theoretical mechanism of formation abnormal pressure, and achieve the effect of improving accuracy

Inactive Publication Date: 2017-06-09
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0004] To sum up, the main problems of the seismic prediction method for formation pressure of sand-mudstone reservoirs in the prior art are: 1. The traditional method only uses the single parameter of sei

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  • Sand shale rock reservoir stratum pressure earthquake prediction method and device
  • Sand shale rock reservoir stratum pressure earthquake prediction method and device
  • Sand shale rock reservoir stratum pressure earthquake prediction method and device

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0035] The traditional seismic formation pressure prediction method mainly has three main defects: single formation mechanism of abnormal pressure, single use of parameters, and low precision. In consideration of the above problems, the inventor proposed a new seismic prediction method for formation pressure of sand-mudstone reservoirs. The method is described in detail below.

[0036] figure 1 It is a schematic flow chart of the seismic prediction method of sand-shale reservoir formation pressure in the embodiment of the present invention, as figure 1 As shown, the method includes the follow...

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Abstract

The invention provides a sand shale rock reservoir stratum pressure earthquake prediction method and device; the method comprises the following steps: calculating the elastic modulus, the microfissure density and microfissure closed rate factors under the limited effective stress according to a Hashin-Shtrikman boundary model and the porosity and shale content of an object sand shale rock reservoir in a research zone; determining the relation between the dry rock elastic modulus and effective stress according to the elastic modulus, the microfissure density and microfissure closed rate factors; determining the effective stress coefficient of the sand shale rock along with the depth changes according to said relation; predicting the stratum pressure of a single well to-be-detected object layer according to said relation and the effective stress coefficient; using an elastic modulus data body obtained by inversion and taking the single well stratum pressure as constraints, and carrying out three dimensional earthquake stratum pressure prediction on the research zone according to said relation and the effective stress coefficient. The method and device can improve the stratum pressure prediction accuracy.

Description

technical field [0001] The invention relates to the technical field of formation pressure prediction in oil and natural gas exploration, in particular to a seismic prediction method and device for formation pressure of sand and mudstone reservoirs. Background technique [0002] The research on formation pressure has a history of more than 40 years. During this period, many scholars proposed various prediction methods for formation pressure based on the latest research results at that time, mainly including logging methods and seismic methods. Whether using logging method or combining seismic method, most of them use the relationship between effective pressure and velocity to predict pore pressure. The most important theoretical basis is the effective pressure principle proposed by Terzaghi in 1943. Now most velocity The conversion formulas with pore pressure are all proposed based on this principle. Hottman and Johnsom proposed the equivalent depth method to predict pore pr...

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Application Information

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IPC IPC(8): G01V1/00G01V1/30G01V1/28
CPCG01V1/008G01V1/282G01V1/306G01V1/307G01V2210/624G01V2210/63
Inventor 李生杰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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