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Method for determining organic porosity of shale gas reservoir stratum

A technology of organic porosity and shale gas, which is applied in the direction of earthwork drilling, wellbore/well components, etc., can solve the problems of high cost, difficulty in continuously analyzing the organic porosity of shale gas reservoirs, and long time consumption, and achieve cost low effect

Inactive Publication Date: 2017-11-17
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, this method is time-consuming and expensive, and it is difficult to continuously analyze the organic porosity of shale gas reservoirs, and it is difficult to reflect the distribution of organic pores in shale gas reservoirs as a whole.

Method used

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  • Method for determining organic porosity of shale gas reservoir stratum
  • Method for determining organic porosity of shale gas reservoir stratum
  • Method for determining organic porosity of shale gas reservoir stratum

Examples

Experimental program
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Embodiment 1

[0038] In the area of ​​Well T1, measure the total porosity φ of different formation intervals of shale gas reservoirs t , the volume content of organic matter V org and the volume content of inorganic matter V silt . The measurement results are shown in Table 1.

[0039] Table 1

[0040]

[0041]

[0042] According to Table 1, the undetermined coefficient φ in formula 3 is determined by least square method Torg and φ Tsilt , get Equation 5.

[0043] φ t =0.2V org +0.036V silt Formula 5

[0044] Therefore, the organic porosity φ org For: φ org =0.2V org .

[0045] figure 2 The organic porosity φ obtained according to Example 1 is shown in one graph org The value of the organic porosity φ measured in the laboratory org value. like figure 2 As shown, the curve 31 is using the organic porosity φ obtained in Example 1 org , the scattered point 32 is the organic porosity φ measured in the laboratory org value. from figure 2 It can be clearly seen in ...

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Abstract

The invention relates to method for determining the organic porosity of a shale gas reservoir stratum. The method includes the following steps: a first step, acquiring the total porosity Phi t, the organic matter volume content Vorg and the inorganic matter volume content Vsilt of different stratum sections of the shale gas reservoir stratum; a second step, establishing a relation between the total porosity Phi t and the organic matter volume content Vorg and the inorganic matter volume content Vsilt, and acquiring the number Phi Torg of pores of a pure organic matter in unit volume corresponding to each stratum section; and a third step, acquiring the organic porosity Phi org of different stratum sections of the shale gas reservoir stratum according to the Phi Torg and the Vorg.

Description

technical field [0001] The invention relates to the field of oil and gas field development, more specifically to a method for determining the organic porosity of shale. Background technique [0002] Shale gas is an exploitable natural gas resource stored in shale formations. Compared with conventional natural gas, the development of shale gas has the advantages of long mining life and long production cycle, which enables shale gas wells to produce gas at a stable rate for a long time. The degree of development of organic pores in shale gas reservoirs is one of the key factors determining the quality and gas-bearing properties of shale gas reservoirs. Therefore, for the exploration and development of shale gas, it is of great significance to determine the organic porosity of shale gas reservoirs. [0003] In the prior art, focused ion beam scanning electron microscopy is usually used to quantitatively analyze the organic porosity of rock cores. However, this method is time...

Claims

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 李军胡松武清钊路菁金武军南泽宇
Owner CHINA PETROLEUM & CHEM CORP
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