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
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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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