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Shale gas reservoir formation pressure calculation method and computer readable storage medium

A technology of formation pressure and calculation method, which is applied in seismology for well logging and other fields, and can solve problems such as not considering the influence of hydrocarbon-generating substances

Active Publication Date: 2019-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above model was established for ordinary shale, and the influence of hydrocarbon-generating substances (organic matter) was not considered in the model

Method used

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  • Shale gas reservoir formation pressure calculation method and computer readable storage medium
  • Shale gas reservoir formation pressure calculation method and computer readable storage medium
  • Shale gas reservoir formation pressure calculation method and computer readable storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0084] In this embodiment, the shale gas reservoir formation pressure calculation method according to the present invention includes:

[0085] Obtain the elastic tensor of wet clay and sandy mixture based on logging data;

[0086] Based on the elastic tensor of the wet clay and the elastic tensor of the sandy mixture, obtain the elastic tensor of equivalent shale;

[0087] Obtaining the acoustic time difference based on the elastic tensor of the equivalent shale;

[0088] Based on the acoustic time difference, the formation pressure of the shale gas reservoir is obtained.

[0089] Specifically, the normal compaction trend line is constructed through the present invention, which can reduce the uncertainty of trend line establishment when the measured pressure data is insufficient, and can effectively consider the influence of lithology on the trend line, and solve the problem of traditional methods when sand-shale interbedded. The unreasonableness of sharing the compaction tr...

Embodiment 1

[0138] The actual logging data of a work area is used to illustrate the implementation process of this method and compare it with the pressure prediction effect of traditional methods.

[0139] figure 1 A flow chart of a method for calculating formation pressure of a shale gas reservoir according to the present invention is shown. Figure 2a-2c It shows a schematic diagram of the calculation results of the pressure coefficient of the target layer of well J1 in the work area according to an embodiment of the present invention. Figures 3a-3d Respectively show a schematic diagram of predicting and calculating the pressure coefficients of the four adjacent wells of well J1 according to an embodiment of the present invention.

[0140] like figure 1 , 2a As shown in , 2b, 2c, 3a, 3b, 3c and 3d, the target layer in the study area is a shale gas reservoir, and the pressure information we have obtained is limited, only the variation range of the pressure coefficient is [1.2,1.55],...

Embodiment approach 2

[0143] In this embodiment, according to another aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and the computer-readable storage medium includes:

[0144] Obtain the elastic tensor of wet clay and sandy mixture based on well logging data;

[0145] Based on the elastic tensor of the wet clay and the elastic tensor of the sandy mixture, obtain the elastic tensor of equivalent shale;

[0146] Obtaining the acoustic time difference based on the elastic tensor of the equivalent shale;

[0147] Based on the acoustic time difference, the formation pressure of the shale gas reservoir is obtained.

[0148] In one example, the obtaining the elastic tensor of wet clay based on the well logging data includes: obtaining the total porosity and clay volume content of the rock based on the well logging data, and obtaining the total porosity and clay volume content based on the total rock porosity and the clay volume con...

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Abstract

The invention discloses a shale gas reservoir formation pressure calculation method and a computer readable storage medium. The shale gas reservoir formation pressure calculation method includes the following steps that: a wet clay elasticity tensor and a sandy mixture elasticity tensor are obtained based on logging data; the elasticity tensor of equivalent shale is obtained based on the wet claytensor elasticity tensor and the sandy mixture elasticity tensor; acoustic wave time difference is obtained based on the elasticity tensor of the equivalent shale; and shale gas reservoir formation pressure is acquired based on the acoustic wave time difference. With the shale gas reservoir formation pressure calculation method adopted, the uncertainty of the establishment of a trend line under acondition that measured pressure data are insufficient can be lowered, the influence of lithology on the trend line is effectively considered, and the accuracy of pressure prediction can be finally improved.

Description

technical field [0001] The present invention relates to the field of oil and gas geophysics, more specifically, to a method for calculating formation pressure of shale gas reservoirs and a computer-readable storage medium. Background technique [0002] Unconventional oil and gas resources represented by shale gas have become a hotspot in the field of energy research in my country. The actual drilling data in the Sichuan Basin show that there is a positive correlation between the daily gas production of shale gas and the formation pressure coefficient. High pressure or ultra-high pressure often corresponds to good preservation conditions, and sufficient formation energy is conducive to high and stable production of shale gas. In the drilling stage, formation pressure is an indispensable key data for drilling fluid and wellbore structure design, and accurate pressure prediction is helpful for safe and economical drilling. Therefore, in the process of shale gas exploration and...

Claims

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Application Information

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IPC IPC(8): G01V1/40
CPCG01V1/40
Inventor 胡起胡华锋朱童曹辉兰许凯
Owner CHINA PETROLEUM & CHEM CORP
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