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Introduction

The documentation describes how to to display wells and wells logs together with seismic in a 3D scene.

The presentation has a practical aspect from exploration drilling. After the initial phase with seismic 2D lines the next phase may be to drill wells to investigate further the interesting structures.

The involved features in Geocap are:

Info
titleIssues in Geocap when displaying well logs and seismic
  • Setting up a Geocap project that will contain all the data
  • Selecting command object menus into a dedicated set in shared commands
  • Reading SEGY files with 2D seismic lines into the project
  • Displaying 2D seismic lines
  • Reading well files with all the logs in LAS format into the project
  • Display the well string and all the logs in the 3D scene
  • Reading and displaying well tops information
  • Reading and displaying well log images
  • Applying a workflow to assist displaying the data

The documentation is a summary of the applied features in Geocap with references to other part of the documentation where the items are explained in more details.


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Setting up a project

A project in Geocap can be generated generic; i.e. along its development. It is however nice to have an initial setup. The project in this text is just called Wells and logs and referred to as the project. Here is the initial setup for the project with wells and seismic lines.

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Working with the project manager and setting up a project is explained in project manager introduction Geocap Projects.

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titleQuick explanation of the folders in the project:
  • Images. A folder to contain screenshots from the screen. Just a nice thing to have in order to save an informative display. The screenshots are taken by data->Screenshots
  • Seismic lines. A folder to contain 2D seismic lines that are present in the wells area. A seismic line is read by Seismic lines->Import->SEGY-2D
  • Well log images. A folder to contain well log images from some paper reports that are saved as images in a picture format (jpeg, png, bmp, etc ) and read into the project. They can be calibrated and displayed in the 3D scene attached to its well.
    A well log image is read by Well log images->Import->Generic. Browse in the images and use Automatic reading.
  • Well tops. A folder to contain well tops. In this case the well tops are taken from NPD's facta pages.
  • Wells. A folder to contain wells with all the logs. The wells are usually in LAS format and read into the folder with the LAS reader that is found under Wells->Import->LAS


Example contents of the well project

 


Selected commands in shared commands

Schema commands and shared commands are essential in Geocap. Read more about these features here: Commands.
For this particular task a set of shared commands has been selected to assist the working process. If you don't have this selected set, download it from well logs, well image and seismic.zip and install it into Shared Commands using the folder icon or Import option. You may also go to the Operation Mode entry and Uncheck all and then only Check the options Wells and Calibration.

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The different command objects of the selected set in shared commands are organized according to their functionality. Here is a brief explanation of their use:

Import

 

 

 

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Import well tops: X Y Z NAME

 

 

 


Info
titleThe format of well tops is:

Top depth (m) Litostratigraphic unit

379378.45 7065951.07 253 NORDLAND GP
379378.45 7065951.07 253 NAUST FM
379378.45 7065951.07 1041 KAI FM
379378.45 7065951.07 1125 HORDALAND GP
379378.45 7065951.07 1125 BRYGGE FM
379378.45 7065951.07 1409 ROGALAND GP
379378.45 7065951.07 1409 TARE FM
379378.45 7065951.07 1487 TANG FM
379378.45 7065951.07 1750 EGGA (INFORMAL)
379378.45 7065951.07 1762 SHETLAND GP
379378.45 7065951.07 1762 NISE FM
379378.45 7065951.07 1811 KVITNOS FM

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To display the well in a thicker line, execute Display well linewidth 3.

Well log image display 

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Well log image calibration

 This is a command object for calibrating and display of a well log report taken from a paper. The image is read into a Generic folder. Then it is calibrated to be displayed along the well.

 

Read more about this in Calibration and display of well log images.

 

The Operation mode entry Calibration shall be checked in in order to see the command object Well log image calibration.


Z annotation
Out of the command objects in this folder one option will be emphasized.

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Z annotate 100

 Highlight a well. Then Execute the command object. The well line is annotated for each 100 meter. Just a quick way to display the height along the well string. The other command objects have similar functionality.

 

Well annotation is also found in the Log Display menu.

 


 Well logs displayed in curve mode together with seismic 

Applying workflows

Workflows are a convenient way to display a composite graphical scene. Below is examples of workflow elements for two wells.

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A specific workflow has been prepared to guide and steer the application. If you don't have this selected set, download it from Well logs in 3D scenes.gwfzip and open it using the File->Open entry. You must edit all the workflow elements to suit the specific project having relevant data.

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