Determination method of organic porosity of shale gas reservoir based on well logging data

A technology of organic porosity and logging data, which is applied in the field of providing key parameters for shale gas reservoir quality evaluation, can solve the problems of relying on core data, inconvenient on-site use, high cost, etc., to achieve wide application range, improve prediction rate, The effect of simple method

Active Publication Date: 2016-12-14
SINOPEC SSC +1
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Problems solved by technology

By searching relevant literature, patents, etc., experimental devices are used to calculate the organic porosity of shale gas reservoirs. These methods rely heavily on core d

Method used

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  • Determination method of organic porosity of shale gas reservoir based on well logging data
  • Determination method of organic porosity of shale gas reservoir based on well logging data
  • Determination method of organic porosity of shale gas reservoir based on well logging data

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example 1

[0040] Example 1: Well B, an evaluation well in the first-phase production and construction area of ​​Fuling shale gas field, is a vertical well. As mentioned above, the logging method for obtaining the organic porosity of shale gas reservoirs includes the following steps:

[0041] 1) Collect the organic porosity φtoc of the shale gas reservoir obtained from the core experiment analysis of the parameter well A in the work area 岩心 and shale gas reservoir logging data, including natural gamma ray GR, compensated density DEN, compensated neutron CNL and TOC calculated by using logging data;

[0042] 2) Calculate the apparent organic matter maturity Roa1 of the shale gas reservoir in Well A according to the formula Roa1=1-(φcnl-φden);

[0043] Where φcnl=CNL / 100, φden=(ρma-DEN) / (ρma-ρf); where the unit of CNL is %, and the unit of DEN is g / cm 3 , the unit of Roa1 is dimensionless, and the value of ρma is 2.77g / cm 3 , the value of ρf is 1.05g / cm 3 ;

[0044] 3) Calculate the ap...

example 2

[0053] Example 2: Well C in the second-phase production and construction area of ​​Fuling shale gas field is a vertical well. As mentioned above, the logging method for obtaining the organic porosity of shale gas reservoirs includes the following steps:

[0054] Step 1), 2), 3), 4) are the same as example 1.

[0055] 5) Collect logging data of shale gas reservoirs in Well C, including natural gamma ray GR, compensated density DEN, compensated neutron CNL, and TOC and porosity POR calculated from logging data;

[0056] 6) Calculate the apparent organic matter maturity Roa of the shale gas reservoir in Well C according to the formula Roa=1-(φcnl-φden);

[0057] Where φcnl=CNL / 100, φden=(ρma-DEN) / (ρma-ρf); where the unit of CNL is %, and the unit of DEN is g / cm 3 , the unit of Roa is dimensionless; the value of ρma is 2.77g / cm 3 , the value of ρf is 1.05g / cm 3 ; The average Roa value of the apparent organic matter maturity of the shale gas reservoir calculated in the well sect...

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Abstract

The invention relates to a determination method of organic porosity of a shale gas reservoir based on well logging data. The method comprises following steps: collecting shale gas reservoir organic porosity data and shale gas reservoir well logging data obtained through work area parameter well core experimental analysis; calculating inspected organic matter maturity Roa1 of the parameter well shale gas reservoir; calculating organic porosity [phi]toca1 of the parameter well inspected shale gas reservoir; obtaining organic porosity coefficient K of the work area shale gas reservoir by means of the cross-plot technology; collecting well logging data of the shale gas reservoir to be processed; calculating the reservoir inspected organic matter maturity Roa; calculating the organic porosity [phi]toca of the inspected shale gas reservoir of the well to be processed; calculating the organic porosity [phi] toc of the gas reservoir; outputting the calculation results of the organic porosity [phi]toc of the shale gas reservoir of the well to be processed. By means of the method, reliable data is provided for shale gas reservoir evaluation and prediction rate is increased. The method is simple and has wide application scope. The method is applied in 182 wells in Fuling shale gas field, and the prediction rate is high.

Description

technical field [0001] The invention relates to a method for determining the organic porosity of shale gas reservoirs based on logging data, which mainly provides key parameters for quality evaluation of shale gas reservoirs. Background technique [0002] In the process of comprehensive logging interpretation and evaluation of shale gas reservoirs, porosity is usually used as one of the important parameters to measure the quality of reservoirs. This method does not distinguish between organic porosity and inorganic porosity of shale gas reservoirs. More and more production practices show that the size and proportion of organic porosity in shale gas reservoirs play a leading role in the productivity of shale gas reservoirs. By searching relevant literature, patents, etc., experimental devices are used to calculate the organic porosity of shale gas reservoirs. These methods rely heavily on core data, are expensive, and are not convenient for on-site use. Therefore, a simple an...

Claims

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 冯爱国廖勇彭超何浩然张建平汪成芳刘施思饶海涛石元会涂妹陈志蓉魏炜
Owner SINOPEC SSC
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