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Introduction

Seislog Plus is a reservoir characterization system consisting of a set of integrated application modules that can be used by the geoscientist for the E&P workflow. This system integrates the data management, mapping, geology, geophysics, petrophysics, seismic inversion and montage display into a seamless environment for the user.

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Software Details

  1. Architecture and Design
  2. Project Database
  3. Database Utilities
  4. Montage Module
  5. Mapping And Contouring
  6. 2D Interpretation
  7. 3D Seismic Interpretation
  8. 2D Seismic Inversion - Seislog
  9. 3D Seismic Inversion - Seislog







Architecture and Design


Seislog Plus utilizes state-of-the-art solutions for user interfaces and database management that are supported on UNIX operating system - available for either SUN Solaris or LINUX platforms. The graphical user interface is based on X Window / Motif while the database implementation utilizes the MySQL relational database. These design choices provide a powerful and cost effective software solution in a flexible and modular software package.

Project Database


The Project Database employed by Seislog Plus and the ability to be networked allows geoscientists to access project data from multiple nodes. This prospect-oriented database defines each exploration or production prospect, field, pool or other user-defined geographic area (concession) as a prospect. Within each prospect definition, data is organized in a set of relational database tables, pointers and data sets that include sub-surface data. The application modules access the appropriate data according to a database schema valid for that particular application. The security model implemented in the database design is such that it only allows authenticated users access to the prospect data.

Database Utilities


Seislog Plus includes a complete set of utilities to load and manipulate all forms of data input and output in a variety of industry standard formats. This module is a windows-based application with a full set of graphics tools that assist the user to interact with data. Data loading may be customized by the end user to interact with many non-standard forms of data using a data import utility which includes a preview feature to edit the data before committing it to the database. The Utilities application generates a variety of reports form the project data available in the database. The easy-to-use interface allows the geoscientist to interact with data without depending on the resources of a technician.

Montage Module


This module accepts Final Plot presentations from other Seislog Plus modules and arranges the presentations in a user defined montage. Final plot presentations are saved for Montage using a 'Save For Montage' feature in all Seislog Plus modules. The user can align displays according to any desired orientation for the presentations and the software provides options that allow the user to control the preview screen display of the montage. The user has the ability to add lines, text, filled polygons and symbols to the montage as well as import external images such as .gif files for a customized label for any montage.

Mapping And Contouring


The state-of-the-art mapping module allows geoscientists to display manipulate and generate hardcopy plots of all the essential interpreted information stored in the prospect database, as well as perform a wide range of operations on this data.

The implementation is based on a set of display overlays, allowing the user to selectively display various data objects in a map. These objects include worldwide grid coordinate systems, well and seismic line locations, and postings of well picks, horizon picks and well ticket information. All map object attributes such as size, color, thickness and orientation can be edited on an individual or group basis, depending on data type and user preference.

A multitude of database attributes such as horizon picks, well picks or random XYZ points can be gridded and contoured. Contours can be manually edited, saved to the database, and / or re-gridded to produce customized interpretations with the gridding and contouring algorithms honouring picked fault planes. All mapping operations can be applied to the whole prospect database or to user-defined subsets, by selecting specific seismic surveys and / or describing a limited geographic area of interest.

The user may perform trend analysis, grid manipulation, isopach or isochron calculations, display and edit imported culture or concession data. The Seislog Plus Mapping module can also display grids in a 3D perspective, in both wire mesh and colour fill display modes. The grid information can be imported or exported in an ASCII format, for use by external reservoir simulation or 3D visualization tools.

2D Interpretation


Conventional 2D-reflection seismic is an integral part of the exploration and production evaluation process. Seislog Plus includes a comprehensive 2D Interpretation module, providing the geoscientist with tools for horizon identification and correlation as well as for analysis and processing of post-stack 2D seismic data. It provides facilities for matching seismic to synthetic seismograms, statics and phase corrections, complex trace analysis, and noise reduction, as well as a complete set of tools for horizon picking and editing.

Data access is facilitated through a map display, simultaneously presenting the interpreted horizon while providing a facility for selection of a multi-line traverses. The software offers accurate horizon interpretation in manual, multi-seed and single seed point modes, with both event time and attribute values are saved in extended precision. There is support for interpretation in reverse fault geologic environments and options for picking on flattened sections in structurally complex areas.

3D Seismic Interpretation


The demand for ever higher subsurface resolution has increased the reliance on 3D seismic data for subsurface evaluation. Seislog Plus 3D Interpretation incorporates a comprehensive array of tools to effectively interpret vast amounts of data contained in modern 3D surveys.

Although many of the interpretive and analytic functions required for 3D data are derived from the 2D Interpretation module, the 3D Interpretation module includes an assortment of advanced display capabilities to aid in handling the extra third dimension. A 3D bin-map display is interactively linked to the inline, cross-line and traverse seismic section displays to show the location of the profile within the 3D survey.

The software provides the ability to generate a user-defined traverse through the 3D survey, to auto pick horizons within a user-defined map area, and interpret on a flattened section. The 3D Map window facilitates display of time or attributes slices within a user defined area and according to predefined time (or depth) increments. All 3D Interpretation displays can be viewed from user specified orientation and with user specified vertical and horizontal scales.

Cross Section Module


The cross section module provides the geoscientist with a flexible tool for geological interpretation. The package includes interactive drafting capabilities to create a professional display of the resulting interpretation. A line of cross section can be selected from a list of wells or location map and easily alternate between structural or stratigraphic datums.

Log curves (including Log Analyses) from the database can be displayed for each well in a user-designed format. Well data such as cores, shows, tests and lithology can be retrieved from the database at the same time and displayed in graphical form next to the log tracks. Formation tops can be created, edited and displayed interactively. Updated tops are saved to the database. Formation correlation lines can be easily modified to display facies changes, pinchouts, fault offsets and unconformities reflecting the interpretation. Text annotation of various size, angle, and colour can easily be added to enhance the presentation of geological concepts in a attractive and meaningful display.

The interpreted cross section can be saved in partial or complete versions for subsequent modification or revision. The module also contains a "quick look" reservoir analysis, based on a Gamma & Sonic log combination. One can quickly generate mappable reservoir parameters for a specified interval in one or several wells, based on user defined log cutoffs.

2D Seismic Inversion - Seislog


Seismic data contains vast amounts of information relating to lithology and stratigraphy of the earth. However, this information is poorly shown, and sometimes even intentionally subdued in conventional seismic displays prepared for purposed of structural interpretation. Seislog inversion provides a method to present this lithological information in an interpretable format, allowing a geoscientist to make lithostratigraphic interpretation within each subsurface layer. Seislog thus leads to an expanded understanding of porosity variations and reservoir distribution and, ultimately, to more accurate estimates of the volume of recoverable hydrocarbon in the area.

The generation of Seislog traces, or pseudo sonic logs from seismic traces, has been one of Teknica's most successful innovations. The interactive capabilities of 2D Seislog, combined with the extensive geological database within Seislog Plus, give the user expanded data for reservoir characterization at and between those wells already drilled in the field.

The Seislog display is a full colour representation of pseudo sonic logs, in depth. Colour is employed to assist the interpreter in recognizing variations in amplitude along the seismic profile, which may now be interpreted directly as interval transit time variations having geologic significance. The user can recognize geologic variations within a layer, assisting in lithostratigraphic correlation, reservoir isopach mapping and reservoir continuity mapping. There is a comprehensive test suite, enabling the geophysicist to interactively establish the optimum parameters for inversion of the seismic data. 2D Seislog also includes a complete interactive velocity editing package designed expressly for establishing the low frequency velocity model appropriate for each seismic profile.

3D Seismic Inversion - Seislog


The 3D Seislog module builds on the features of the 2D Seislog module and extends them into 3D domain. A full 3D cube of Seislog traces is created, in time or in depth, to provide opportunity for exceptionally detailed interpretation of hydrocarbon reservoirs. This is an invaluable technique for the explorationist who wishes to transform seismic amplitudes into quantitative interval transit time (or velocity) values to gain an understanding of the stratigraphic variations between wells. It gives the user the ability to map structure and isopachs of lithologic units and depositional systems, eliminate time distortion and velocity effects to produce seismic maps in depth, define reservoir characteristics and optimize development programs that will extend the life of oil and gas fields


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