Well Data Correlations to Alltons Vertical CSEM Data

Allton has recorded a compilation of published well information correlated to vertical CSEM data for well locations near 2017 and newer vintage 2D or 3D Allton vertical CSEM data. These well correlations were derived from publicly available resistivity information from dry holes, discovery wells or field development wells.

Table 1 captures correlation statistics from wells used for survey calibration and analysis drilled prior to vertical CSEM data acquisition. When vertical CSEM data matches the well calibration point, dry or discovery, this is quantified as a success. If the vertical CSEM data does not match the well, it is quantified as inconclusive. As these surveys were designed for specific targets, often the vertical CSEM results are inconclusive because the target is below sensitivity detection level of the technology or acquisition configuration for the survey.  Most common reasons for an inconclusive response are depth to target, low resistivity in the reservoir versus the background or to small hydrocarbon volumes.

Table 2 captures correlation statistics from any well drilled after vertical CSEM data has been acquired. Vertical CSEM data was evaluated and inverted based on best knowledge and information available to PetroMarker prior to released new well results.

For any area, the publicly available information accessible to PetroMarker is often incomplete and less accurate as compared with information available to operators and exploration companies active in that area.   

Table 1

Well Correlation Statistics from Wells Drilled Prior to Vertical CSEM Data Acquisition

Number of wells drilled

Dry wells or hydrocarbon shows matching vertical CSEM data

Discovery wells matching vertical CSEM data

Wells with inconclusive vertical CSEM results

Success rate – vertical CSEM data matches the reported well data results

29

15

7

7

76%

Table 2

Well Correlation Statistics from Wells Drilled
After Vertical CSEM Data Acquisition

Number of wells drilled

Dry wells or hydrocarbon shows matching vertical CSEM data

Discovery wells matching vertical CSEM data

Wells with inconclusive vertical CSEM results

Success rate – vertical CSEM data matches the reported well data results

1

1

100%

For further details regarding statistics or specific well results,
please contact Aslak Myklebostad or Svein Ellingsrud.

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