All Products

1. Log learning set
2. LAS file Editor
3. LAS log Displayer
4. Functions Workflow
5. Summaries & Upsc
6. Ionic Water Analysis
7. Log Scripting

• Scripting Manual

All Services

1. Assembling
2. Processing
3. Interpretation

All Recipes

1. Merging LAS files
2. Demo files data set
3. Core Data Import
4. Computing Net-Pay
5. Petrophysical Cutoffs
6. VSH from GR index
7. VSH from Neut-Dens
8. Water Saturations
9. Indonesia Water Sat.
10. Mod. Simandoux Eq
11. Fracture Porosity
12. Geomechanic Logs
13. Split Rock Volume
14. Mineral Solvers
15. Pay Indicator Index
16. Water Salinity & Rw
17. Estimating Rw & m
18. Estimating RHOM

1. Water Sat. from Rxo
2. Porosity from Rxo
3. Vshale or Vclay ?
4. Gas cap detection
5. Biased Beta Distr

• TechLog vs GeolOil
• LAS Mnemonics list
• Software releases
• Questions & Ans.
• Testimonials
• Jobs

• 2020 October 25. Build version ID = 3BC172
  A new, widely usable minimal mineral solver that runs only with Vshale and RHOM was added. After VSH is estimated, and the matrix density RHOM is estimated from the neutron to density contrast, this simple maximum entropy solver finds the volumes of clay, silt, quartz, calcite, and dolomite. Since curves for neutron porosity and bulk density are quite common, this mineral solver allows to explore and gives a clue of the dominant minerals in the matrix.
  
  
  
  




• 2020 October 13. Build version ID = 038A98
  The SW water saturation ratio equation, now includes a correction for VSH shaliness. As expected, it yields smaller water saturations than Archie when VSH > 0. One more time, Archie over-estimates the amount of water, overlooking potential pay candidates.




• 2020 October 12. Build version ID = B38EBE
  Two new Vshale equations were added to the Functions Work-flow: The generalized Stieber equation, and its self adjusting C continuous curve parameter to calibrate VSH against an unbiased reference, like VSH from Neutron-Density.




• 2020 October 01. Build version ID =08220C
  GeolOil is migrated to Java-15, while keeping legacy compatibility with Java-8/x64-bits, Java-9, Java-10, Java-11, Java-12, Java-13, and Java-14.




• 2020 August 27. Build version ID = 9343A3
  Improved Button-SpaceBar focus policy for a better user experience.




• 2020 May 16. Build version ID = 3B0A18
  Log plots are now displayed by default with a double scale: a regular MD scale, and a TVD-SS, TVD, & INC navigation scale in the first track. This is particularly useful for tilted and horizontal wells. The horizontal well below has an inclination of more than 90° (it is navigating upwards). Notice how TVD decreases while MD increases. The horizontal path is intersecting a tight "U" shape channel of quartz and calcite, with permeabilities in the order of nano-Darcies.
  
  
  
  




• 2020 April 01. Build version ID = D3CA79
  GeolOil is migrated to Java-14, while keeping legacy compatibility with Java-8/x64-bits, Java-9, Java-10, Java-11, Java-12, and Java-13.




• 2020 March 01. Build version ID = 940DCE
  This release incorporates a downloadable GLOG learning example to estimate RHOM matrix density ρ_m using only log curves without any core laboratory measurements. An accurate RHOM estimate is needed to compute porosity, water saturation, and estimate a permeability correlation equation.




• 2019 December 30. Build version ID = 211CFA
  Icon flags to tag wells observing Gas-Oil-Contact (GOC), and Water-Oil-Contact (WOC). Minor improvements on Graphical User Design (GUI) buttons. Software model is called now 2020, with soon upcoming new specifications and features. Java-8 is deprecated and will be removed in a future release of GeolOil. It is still functional for backwards compatibility. Users are encouraged to migrate to JDK 13 or newer.




• 2019 November 22. Build version ID = DCCECE
  Three new method functions were added to estimate rock matrix density from easily available log data. They are the perfect companion to GeolOil's RHOM mineral solvers:
  
  (25) In not too clayey rocks and no gas zones, RHOM is estimated by matching the behaviour of the curves Bulk Density and Neutron Porosity. It is similar to cloud cross-plots to detect main lithology, but its output is instead a whole RHOM curve varying with depth MD. The method even incorporates a correction for small shale content VSH to improve accuracy, and also aids to detect gas zones: As the method doesn't converge for gas, it may be a clue that suggests the presence of some free gas.
  
  (23) & (24) When there is core porosity data, and either a bulk density or neutron porosity curve, RHOM is estimated but matching which grain density succeeds to replicate the porosity values measured on the core (make sure that the core is correctly shifted). These two functions provide useful reference estimates even when core grain density values are available, as in some cases values reported by the lab are no very reliable and may underestimate the correct RHOB.
  
  
  
  




• 2019 October 03. Build version ID = FA55B9
  GeolOil incorporates a server service to update an optional extra data-set of log examples. This service speeds up the learning of petrophysical concepts and log interpretations.




• 2019 September 15. Build version ID = E69983
  GeolOil is fully migrated to Java-13, while keeping legacy compatibility with Java-8/x64-bits, Java-9, Java-10, Java-11, and Java-12




• 2019 June 09. Build version ID = 0853A0
  Schmoker equation to model TOC Total Organic Carbon in Oil Shales.




• 2019 May 17. Build version ID = F563A6
  Logic scripting capabilities were added with the incorporation of two indicator functions. This makes far easier to write short programs.

              indicator func: ind(x,y)   = 1 if x <= y, 0 if x > y, -999.25 if decision fails as x,y could be -999.25
                        func: ind(x,y,z) = 1 if (x<=y) and (y<=z), 0 if at least one condition is false, -999.25 unknown
              

• 2019 April 27. Build version ID = 318EC40
  New LAS 2.0 Section of Well Tops was added. The ~Tops section is not a standard default section in the CWLS year 2017 LAS 2.0 updated specs. However, it is permitted and increasingly popular. GeolOil now adds support for it.




• 2019 April 15. Build version ID = 9DF605
  Clastic mineral solver with components: quartz, silt, and clays illite, smectite, kaolinite, and chlorite.




• 2019 April 07. Build version ID = 1230A0
  Two new robust functions to estimate effective porosity even in cases of moderate bad boreholes with washouts.




• 2019 April 03. Build version ID = AC6B02
  GeolOil is fully migrated to Java-12, while keeping legacy compatibility with Java-8/x64-bits, Java-9, Java-10, and Java-11.




• 2019 March 03. Build version ID = 6979A7
  Kerogen deterministic solver with components: Clay, Silt, Lithics, and Kerogen.




• 2019 February 23. Build version ID = 7748B5
  Fuzzy logic seven components mineral solver: Clay, Silt, Quartz, Calcite, Dolomite, Anhydrite, and Salt.




• 2019 January 27. Build version ID = E0EBCA
  GeolOil is fully migrated to Java-11, while keeping legacy compatibility with Java-8/x64-bits.




• 2018 September 28. Build version ID = A8DCB2
  Added the correlation functions GeolOil-Holmes, and Holmes-Buckles to model Irreducible Water Saturation.




• 2018 August 27. Build version ID = 07061B
  File locking system for network environments. Several users can work concurrently on a same GLOG without risk of collisions.




• 2018 July 30. Build version ID = 083941
  Added correlation functions for Winland R35, RQI, FZI, and Pittman pore throat.




• 2018 June 12. Build version ID = A04646
  Hand typed functions editor: A simple and minimalist scripting language engine.




• 2018 April 04. Build version ID = D24C11
  Ionic Water Analysis: Equivalent NaCl water salinity and ions mEq electrical equilibrium from lab dissolved anions and cations PPM measurements of Sodium, Chloride, Calcium, Bicarbonate, Magnesium, Sulfate, Potassium, Nitrate, Iron, Carbonate, Ammonium, Bromide, Lithium, Iodine, Strontium, OH, Barium, Fluoride, and others.




• 2018 Mar 02. Build version ID = FCB7CE
  Import and export core data and curves from and to Excel .CSV




• 2018 Feb 10. Build version ID = 3EA9F2
  Seven more functions with correlations are equations were added: 3 correlations for Holmes-Buckles irreducible water saturation SW_irr, and 4 equations to estimate water cut, and for relative & effective permeabilities to oil and water. Total amount of built-in equations and correlations increased from 77 to 84.




• 2017 December 27. Build version ID = 3E2F1A
  Pay Indicator index screening function added to the module of Sequential Petrophysical Functions and Correlations. Total amount of built-in equations and correlations increased from 74 to 77.




• 2017 December 12. Build version ID = 9EB523
  Unique multi-platform installer for Windows-PC, MacOS, and Linux. More accurate computation of 3D borehole trajectories. Improved estimation of water salinity from R_w at reservoir temperature. Sinusoidal unconformity shape added as a stratigraphic marker. Handling of log curves and fillings with color transparency alpha channels.




• 2017 June 6. Build version ID = 5F352D
  Natural Neighbors 3D interpolation for structural modeling, programmed on parallel threads. (Not be be confused with Nearest Neighbors)




• 2017 May 29. Build version ID = 8369A3
  Estimation of formation water resistivity R_w from micro-resistivity.




• 2017 April 27. Build version ID = 5289FD
  Estimation of Total Vertical Stress σ_v through the whole integration of the bulk density curve.




• 2017 March 31. Build version ID = 295585
  
Petrophysical Mineral Solvers: Calcite-Dolomite-Anhydrite-Halite, and Sandstone-Dolomite, using variable parameters.




• 2017 February 20. Build version ID = 71D08
  Conversion of Neutron Porosity curves for variable continuous blend of rock matrices.




• 2016 May 6. Build version ID = B043F5
  Independent GUI buttons for log's vertical and horizontal zoom. Minor bug fixes and improved safety and security against hacker attacks. Improved stability of water saturation computation through capillary pressure height.




• 2016 March 1. Build version ID = 4B541D
  The first release for GeolOil in 2016 includes a new module: Sequential Petrophysical Functions. The user specifies key parameters to update log curves in a chained dependency computation. It is like specifying a short graphical algorithm. The release also adds new features to save all master GLOG files with a single click and more.




• 2015 Oct 2. Build version ID = 7EA8B7
  This release allows better functionality to shift core data and curves. New zone type called "Mark" puts streaks on the log plot by just keeping the mouse pressed and hitting the space bar.




• 2015 Aug 1. Build version ID = 240381
  This release allows to fully re-sample LAS files to any depth step resolution, start and stop depths: Create a new LAS file template with the desired specifications. Open one or several LAS files, export their desired curves. Import the curves into the new generated blank LAS file, that's all. The procedure is used to re-sample a LAS file itself, or to merge several dissimilar LAS files.




• 2015 Mar 2. Build version ID = A5A641
  This release allows to fully edit LAS files. The user not only can edit and change individual curve values at depth bins, but also can move and edit curve mnemonics and parameter sections.




• 2015 Jan 22. Build version ID = 695246
  Merging curves from different LAS files is easier than ever with our improved GUI design of the Curves Section tab. Just load a source LAS file, export the desired curves and import them into the target GLOG. New release also allows to edit individual curve cell values or remove whole curves from a LAS file. Optimized memory handling to manage even larger LAS files. Visual color range contrast of cell values on the "Edit Table" display is now adaptive and has been extended to its absolute maximum.




• 2014 Oct 25. Build version ID = 458B25
  Our new Well log upscaling module has been released. It enables a large diversity of upscalings: Intensive upscalings for porosity, water saturation and averages; Extensive upscalings, like Net-Pay, Net-Sand, hydrocarbon column, etc. The module also allows to estimate formation water resistivity by the Hingle method, and the Cementation exponent "m" by our exclusive GeolOil method.




• 2014 Aug 31. Build version ID = C9C26D
  Better log plot display. Now clicking on log with the right mouse button and dragging it, enables to measure the thickness of a zone. Minor bug fixes and improved stability.




• 2014 May 16. Build version ID = AE6F2F
  Improved logical arrangement of GUI buttons. The user can now save a GeolOil GLOG master file at any time, even before a log plot is made. New layout design allows more window space for plotting.




• 2014 Mar 1. Build version ID = A8DA4D
  The free GeolOil Logging Scripting (GLS) has a new instance overloaded method readFile to merge multi-column, irregularly depth spaced core lab data as new appended curves to a LAS file. This method is ideal to import core lab data from Excel spreadsheet files. Just export the Excel data cells as an ordinary space delimited plain text file and import it with a few GLS script lines.




• 2014 Jan 23. Version SHA1 ID = 362292BB4AC56E36AB23316419AB54068D9F49B2
  The free GeolOil Logging Scripting (GLS) now allows to merge LAS files. You may take one or more curves from a LAS file, other curves from other LAS files, and merge them all into another LAS file, even if each LAS file has different depth step resolution.




• 2013 Nov 29. Version SHA1 ID = 43F3619F5EB29B21197E5CB59BAD181922AC6662
  GeolOil now includes a new well TAB called: [Geometry Path]. With it, the user can load the well log vertical reference to the sea level (like Kelly Bushing KB or Derrick Floor DF), the flat-planar surface coordinates, the latitude and longitude, and the 3D well path Deviation Directional Survey trajectory file. Now with a single button click, GeolOil shows the exact well location spot on a Google Map for reference purposes.
  

  
  

  New additional features to the GLS scripting language include the use of Akima Splines to offer an alternative interpolation method to natural splines to use digitized log curves, and irregular {(MD-digitized, MD-log)} non linear transformations to better match digitized Measured Depths to log real MDs. Well log digitizing services to produce digital LAS files from legacy original well raster images are available upon request.




• 2013 Oct 19. Version SHA1 ID = A0EB9B0A231A129AE5C6DE2C42300D769F7113F5
  LAS file plotter now includes 16 different zone types: Marker, Tag, Annotation, Label, Formation, Member, Bed, Completion. CoreTake, FluidTest, CoreTest, Facies, Unit, Layer, Interval and Zone.




• 2013 Sep 16. Version SHA1 ID = F5627C0B4DE0C9AFBFD916EF276F35D69C1DB909
  Improved GLS language compiler. Better display of logged core measurements. Minor bug fixes.




• 2013 Aug 26. Version SHA1 ID = B116B62369237784554F7B9208F8B6AB648845DE
  3D Corner Point Geometry simulation grid module now computes cells connected to an aquifer.




• 2013 Jul 3. Version SHA1 ID = 6EAC11C2808C9977CAC676EDE1C0835A8F6209CF
  GeolOil has released a digitally signed LAS viewer Micro-Edition: A tabular .LAS files reader bundled with the GLS scripting programming language. From July 2013, all GeolOil editions become digitally signed through a trusted certificate authority (CA), currently THAWTE, a subsidiary of SYMANTEC. This adds additional security features for all GeolOil Corporation software.




• 2013 Jun 3. Version SHA1 ID = 5C48C1739991E502DC0FB53AEFDD18E9D89D90ED
  Handling of different stratigraphy definitions per well.




• 2013 May 31. Version SHA1 ID = A33819909720ADE4BF6D0DF205D6E15ECA684233
  Better arrangement of stratigraphy menu buttons.




• 2013 Apr 03. Version SHA1 ID = 7FA68A7D57337ABC49E27C82C18C10BF77994E33
  Rock partition GLS recipe to split rock volumes into VSH, PHIE, SW and SH is now included into built-in demo dataset.




• 2013 Mar 20. Version SHA1 ID = 5E99AD9F97B22869BFF2AC7AD5A5F46E1CA04848
  Minor bug fixes for LAS and GLS modules.




• 2013 Feb 20. Version SHA1 ID = 49F236C65405DC85BDC3124BB6B99CD22CC3DC1F
  GeolOil has released the new technology GLS GeolOil Logging Scripting programming language for the Windows.




• 2013 Jan 25. Version SHA1 ID = CEC30E894C21E922B655990F040D7FDE13BC07E9
  GeolOil has released lite versions of the LAS log reader, viewer and plotter modules.




• 2012 Dec 05. Version SHA1 ID = D5BE8474B0C0CA859416AA87DC69F556B183B34E
  GeolOil has released three new editions of the LAS well logs module: A completely free LAS log reader, a lite LAS log viewer, and the full featured LAS well log plotter.




• 2012 Nov 06. Version SHA1 ID = 2E317ADA76E254557DDE505F17F49A1A346F92AF
  This release fixed minor bugs and improved the web help button.




• 2012 Oct 04. Version SHA1 ID = 8504FB600F9C76B80329E836C38FFDC7AEDAAA52
  This version improved well log zone fillings display, both threshold and curve crossovers.




• 2012 Sept 20 Version SHA1 ID = E8FCD839883C3AD9F37E40BE33ED902E37875EF0
  This version enables copy of PROPERTY elements and ACTNUM between Corner Point Geometry Grids.




• 2012 Aug 07 Version SHA1 ID = BB7175C1D644F36F525B01285C5CDD168370AE2B
  This version improved Bezier polynomials computations.




• 2012 Jul 25 Version SHA1 ID = DBFF7808823C8CB67A4F9BDA747349C1107BD638
  Perforation date scheduling coupled with 3D cell navigation in the Corner Point Geometry Grid.




• 2012 Jun 06 Version SHA1 ID = 8F8B57A6F049774C4127A90B0BAAA8BB61517939
  Support for XML GeolOil well logs *.glog formatted files. (A proprietary format of GeolOil)




• 2012 May 25 Version SHA1 ID = CC12947E6C98DCDF285F4299B1F1AEADE1C73C4F
  Improved computation of 3D deviated wells trajectory path.