Petrolog is a specialised Log Data Management, Petrophysical and Imagelog Analysis software platform that performs many of the tasks associated with the management and evaluation of well log data. Petrolog is at the forefront of the industry by keeping abreast of new technology and the development of new advanced interpretation models.

Petrolog has been developed with the close interaction of its many users and their feedback. Crocker Data Processing welcomes any comments which will contribute to the future development of Petrolog to make it more powerful at the same time as more intuitive for its users.

History

The original version of Petrolog was first released for the oil industry on mainframe (VAX, PRIME) in 1982. Since then it has been ported to all popular operating systems. (Unix, Linux, DOS, Windows 95/98/2000/XP). In 2006, the software was ported to the Microsoft Windows .NET framework using the latest C# language. All features and processing methods in the original Petrolog software has been ported.

For new users and users migrating from the old Petrolog software, a set of Tutorials have been created to give an overview of a complete well processing workflow. This is in addition to a detailed set of context sensitive help files (accessed via the F1 key).

For example, a detailed overview of the our CPX Petrophysical Analysis technique (CPX Analysis: Step-by-step overview) is available to guide the user through the sequence of steps required to take to obtain a full petrophysical well analysis.

V10.0 Software Modules Overview

Basic Module

This module is required to support any additional interpretation modules and includes the following items:

• Petrolog Desktop: The Petrolog Desktop the various controls to create and manage a field or well based project. The desktop also provides full multi-well processing capabilities and a map view tool which includes contouring capabilities on key petrophysical quantities.

• Import/Export Data: Petrolog can import and export data from several industry standards including LIS, LAS/LBS 2.0, general ASCII and SEG-Y into our proprietary binary format file. This module also has an extensive set of tools for verification and reading from a variety of legacy tape media and formats (including 9-track, DAT and exabyte tape media).

• Discrete Data Management This is a set of tools to allow management of well header information, any type of non-continuous well data (e.g. Directional Surveys, Core, DST or Formation Tests) and Strata type data (e.g. Formation Tops)

• Continuous Log Management: This is an extensive set of tools to manage, edit and perform simple processing of continuous well log data. The log editing functions include both tabular and graphical methods of merging, editing, TVD processing and a powerful user-defined algorithm module.

• Graphics: Includes plots for all log types, histograms, cross-plots (both 2D and 3D) and stereographic projections. All graphics can be sent to all windows supported printers and plotters and to a variety of graphical formats including EMF, PDF, JPG etc.

• Montage Editor: A graphics editor that allows users to edit and build A0 or larger presentations including saved plots, cross-plots, histograms and any other type of images in almost any graphical format.

• Data Mining: Includes a variety of data analysis and reporting tools.

• Petrolog Tools: A set of tools including a fully featured "petrophysics" calculator, utilities to convert existing Petrolog V9 data and plot formats to V10, graphics conversion utilities and the Petrolog evaluation request utility.

Log Analysis

This module provides an extensive variety of Petrophysical Log Analysis functionality including the following items:

• "CPX" Integrated Log Analysis: A fully integrated crossplot based analysis system utilising either the Complex Lithology, Sand-Silt-Shale (SSS) or Two Water (TWA) models. This technique has been developed and refined by CDP over the last 20 years and is being used successfully for a huge range of clastic and carbonate environments from all over the world. The CPX integrated analysis includes the following features and output logs:

  • Environmental Corrections for all standard logging tools from the major Wireline & LWD Service Companies (Schlumberger, Halliburton, BHI, Weatherford/Precision/Reeves/Computalog, Tucker, Probe). The log analysis processing will handle any mixture of different logging tools in the same well.

  • Vclay determinations from 9 clay indicators, with non-linear transforms and various final Vclay indicator selection options.

  • Ability to use any combination of external logs (Vclay, PHIT, PHIE) and input parameters (a, m, n, Rw etc)

  • Gas and shale corrected Effective and Total Porosity automatically generated from best available porosity logs.

  • Wide range of Saturation Equations based on both SWE (Indonesia, etc) and SWT (Waxman-Smits, etc) methodologies.

  • Dual clay resistivity model and glauconite options available with all models.

  • Lithology and permeability determination available using various techniques.

  • Uncertainty estimation of the key petrophysical results.

  • Computation of a "pseudo" DTC, DTS and RHOB based on the results of the log analysis. Either the original logs or these are use to compute and detailed set of Rock Mechanics and Rock Strength logs.

  • Additional processing available for various auxiliary logging tools and techniques including NMR, TDT, EPT and CBM (Coal Bed Methane) using the results of the CPX Integrated Analysis.

• "CPX" Multi-well Processing: Unlimited number of wells can be processed utilising strata selections and a single well reference CPX analysis.

• "Quicklook" Analysis: A set of tools to enable a user to manually perform a "step-by-step" analysis using basic principles to generate Vclay, Porosity and Water Saturation in sequence.

• Multi-mineral Analysis: A multi-mineral probabilistic analysis method to complement the existing "CPX" and "Quicklook" deterministic approaches. Determine your minerals and lithology volumes probabilistically.

• Neural Network Analysis: Supervised or unsupervised NN. Use of the Self Organising Map technique to estimate missing logs, permeabilities or facies based on a representative training data set.

DLIS

• The optional Import/Export DLIS module is required to Import or Export DLIS log data.

Imagelog

• The Imagelog Analysis module supports a wide range of Dipmeter and Imaging tools (FMS, FMI, EMI, HMI, STAR, Sonic images, BHTV, 3, 4 or 6 arm dipmeter tools, RAB, ADN tools etc.) This includes all the required corrections such as Emex, speed corrections, button and pad depth shifts, arm swing corrections etc.)

Synthetics

• The Synthetic Seismogram module includes the capability to read/write SEG-Y files, perform check shot corrections and compute synthetic seismograms

Diglog (currently only available in Petrolog V9)

• The Board Digitisation module allows digitisation of logs directly from film or prints using a digitising board.

Mining (currently only available in Petrolog V9)

• The Data Mining module supports the importation of data from various proprietary formats used in the mining industry (slim hole tools, sonic images etc). Formats will be ported on request to Petrolog V10+.

Prodlog (currently only available in Petrolog V9)

• The Production Logging module is used to compute such logs as Carbon-Oxygen and Production Logs (Pressure, Temperature, Gradiomanometer, Flow meter, etc).

Cross-Sections (currently only available in Petrolog V9)

• The Cross Section module is used to generate multi well cross sections

Waveform (new module currently under development)

• A new Sonic Waveform Analysis module to determine DTco, DTS and Stonely arrivals from monopole and dipole sonic tools, multiple array sonic and slim hole sonic tools used in the mining industry. This service is currently available in the main office until it is fully ported to Petrolog.