AGB Gas PB Calc Help

Overview
Parameters
Info and FAQ
Thanks to
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Overview:
Software: AGB Gas PB Calc
Author:     Alexey Bogdanov
Version:   1.0.0, released on 17.09.2015

Distribution conditions: this software application available free of charge (Freeware), without any advertisement built-in  modules, for both commercial and non commercial usage.

Purpose: developed for probabilistic (using Monte-Carlo method) or deterministic* gas reserves / resources volumetric computation.

Algorithms: two standard gas volumetric algorithms available applicable to both probabilistic and deterministic computation methods:

 #1 Standard deterministic volumetric method used in Russia / ex-USSR
 #2  International deterministic volumetric method using Bgi parameter.

    Please note, that author assures that software and algorithms were tested before releasing the software, but still he can not be responsible for any possible losses arise from either usage of this software or usage of results computed by this application.

    In case of any issues, errors in application or suggestion for future development - please contact author using technical support e-mail: <support@agbcorp.ru> Please do not forget to specify name and version of software application you are using and parameters of you device where application installed.

    Please visit author's web site: www.agbcorp.ru/ to check for additional information, future development plans or to support future application development.

    Application interface is bilingual and available in Russian (default language) and English. To switch between languages - just click on flag image located in the left bottom corner of main application window.

* - for pure deterministic gas reserves / resources computation author suggest to use separate AGB Gas Calc application available from AGB Corp. Project website.

Parameters:

Basic rules on volumetric probabilistic / deterministic computations using this application:

1. Correctly select units**  and source computation parameters, taking into account that application use European system
     where value for P90 (meaning that there is probability of 90% that resulting value would be equal or higher then specified
     P90 value) always lower then P10 (which means that there is just 10% probability that specified P10 value would be equal
     or greater to specified number) .

2. Select computation algorithm using menu "Algorithm": #1 - Russian / ex-USSR volumetric computation algorithm, #2
     International volumetric computation algorithm.

3. Select required unit for the computation results.

4. Specify desired distribution type for probabilistic computation: Norm  - for NORMAL distribution (default value), LogNorm -
     LOGNORMAL distribution, Uniform - UNIFORM distribution or select Const to use constant value instead of distribution. If
     you select Const option for all computation parameters then AGB Gas PB Calc would perform deterministic computation
     instead of probabilistic - but for deterministic computation I strongly suggest to use separate AGB Gas Calc application. In
     all other cases AGB Gas PB Calc would perform true probabilistic gas reserves /resources computation.

5. For probabilistic computation please select required method to determine distribution parameters. For NORMAL (Norm)
    or LOGNORMAL (LogNorm) distribution available options are: P90/P10 (default), P99/P1, P75/P25, P50/P1, Pmean/P10
    and P90/P50. For UNIFORM (Uniform) distribution available only one option where you specify minimal (Min) and maximal
    (Max) values.

    [IMPORTANT !!!] Please note that if you changed distribution parameters option or distribution type - application would not
    automatically recompute your new parameters - you have to re-input and check them by yourself.

    Please note that LogNormal distribution parameters computed for distribution with parameter Threshold = 0.0 !

6. Press <Compute> button for actual computation process. For probabilistic computation application use 10000 iterations
     for each probabilistic computation parameter. Probabilistic computation performed using parameters distribution
     according to worldwide accepted probabilistic gas reserves / resources computation method.

7. Application would check acceptability of input parameters and if no error found would compute result. If any obvious errors
    found - then user would have to recheck (input values where error was found would be highlighted in red) and correct
    input values  - without this step computation can not continue.

Please note, that depends on used algorithm - few input fields might be invisible. Selecting different units or by using "Reset" option application would switch all input fields back to visible state. Also please note that there is no "on the fly conversion of input fields values" option - and it is very important to select proper units for input fields. You could use AGB Units Conversion application (under development, not yet released) or third party software for the conversion of input values between units if they are not available in application.

** - depends on computation algorithm selection some input fields, that not required for particular computation, would be invisible to user.

To reset application to the default parameters and units one could use menu option - "Reset"
 
Computation parameters:

[F] - computation area. Important to select correct units for input value - at present time following units supported: m² (default), th. m², km², ft², mile², acre and hectare.

[H eff. g] - effective layer thickness. Important to select correct units for input value - at present time following units supported: m (default), cm, mm, km, ft, yard and mile.

[Phie] - effective porosity coefficient. It is possible to specify value either in PU (values between 0 and 1) or in '%' (values between 0% and 100%)

[Sg] - gas saturation coefficient. It is possible to specify value either in PU (values between 0 and 1) or in '%' (values between 0% and 100%)

[Rec] - gas recovery coefficient. It is possible to specify value either in PU (values between 0 and 1) or in '%' (values between 0% and 100%)

[POS] - probability of success factor coefficient.  Value should be bigger then zero and lower or equal to one. POS = 1.0 means that there is no risk. The lower value you specify - the higher corresponding risk would be. If default value of 0.0 used - software would not compute risked recoverable reserves / resources. It is possible to specify value either in PU (values between 0 and 1) or in '%' (values between 0% and 100%)

[Kp] - pressure coefficient, it is also possible to compute this coefficient using following input parameters: [P init.] - initial layer pressure, [a init.] - correction coefficient for deviation of hydrocarbon gases from Boyle's law at the initial layer pressure, [P res.] - residual pressure, [a res] - correction coefficient for deviation of hydrocarbon gases from Boyle's law at the residual layer pressure. Please note, that quite often in computation used [P res.] = 0, and, as a result, only [P init.] and [a init.] parameters used. (used in Russian / exUSSR Algorithm #1)

[Kt] - temperature coefficient, it is also possible to compute this coefficient using following input parameters: [T res.] - reservoir temperature. (used in Russian / exUSSR Algorithm #1)

[Bgi] - gas formation volume factor, available units rcf/scf (value less then 1.0). (used in International Algorithm #2)

<Compute> - this button would initiate actual volumetric computation. Software checks input values. If any issues with input values noted then error message presented to user. Incorrect values have to be replaced. If no issues noted - application performs computation.

{Result units} - specify required units for the computation: MMcm (million m³), Bcm (billion m³), MMcf (million ft³) or Bcf (billion ft³)

Info and FAQ:

1. Current version of application does not support input volume value instead of area and thickness. But if you got input volume value (obtained for example from geological modeling software package) - it is still possible to use it - by correctly specifying input units for area and thickness, for example if input volume is 750000 m³, then we could select area units as 'm²' and thickness units as 'm' and use value 750000 for area and 1 for thickness.

2. Application provide special forms to compute Kp and Kt coefficients using source data instead of just using existing values for these coefficients. To access these forms please use "Compute Kp" or "Compute Kt" buttons. Depends on what distribution you select for these parameters and how you plan to define that distribution - software would allow you to select proper option i.e. to select for example P90 or P10 value to be computed for Kp if distribution option for that parameter set to P90/P10 e.t.c.

Thanks to:

Android version of applications:

<warwound> - for "AndroidResources" and "Resources" libraries
<klaus>    - for help files viewer example: "HelpScrollView"

Another way to help this project is to share the information on this and other applications developed by Alexey Bogdanov (www.agbcorp.ru) using major social networks such as LinkedIn, Facebook, Twitter, e.t.c

Thank you beforehand and good luck with your volumetric computations !

Please note that AGB Gas PB Calc and AGB Gas Calc are multi-platform applications available for Android***, Windows, Linux***, MacOS*** - please check application web site for additional information.

*** - Currently AGB Gas Calc Linux application available for Android, Windows and Linux OS, while AGB Gas PB Calc available only for Windows OS now and versions for other platforms would be released later this year.  MacOS versions are under development and would be available some time in the future.

    Commercial version of AGB Gas PB Calc application (with extended functionality - AGB Gas PB Calc Pro) also planned - please check AGB Corp. Project website for information updates on this subject.