Comparing DIAS32 3D Surveys with Conventional 2D Surveys

Overview

Dias Geophysical’s DIAS32 3D induced polarization and resistivity (DCIP) system is unique in its ability to deliver high volume data sets that include both multi-azimuth and multi-scale dipoles. These data sets support highly resolved and accurate 3D models of resistivity and chargeability.

• In DIAS32 surveys, dipoles are built in-line and cross-line and with varying azimuths for dense, rich data sets
• DIAS32 data sets combine high resolution and depth sensitivity for robust and accurate 3D models
• Accurate models reduce exploration risk

Situation

In many environments, conventional 2D DCIP surveys image the geology with a high degree of uncertainty. 2D surveys generally produce a relatively low data density and lack the ability to confidently image sources between the survey lines. As a result, there is significant risk in targeting drill holes in complex geologic environments and the ability to accurately image deep sources is limited.

DIAS32 Solution

Dias has patented a completely new mode of acquiring IP and resistivity data called CVR. The DIAS32 system measures the response from individual electrode sensors relative to a common voltage reference (CVR) wire. DIAS32 provides advantages in safety, operational efficiency, data volume and data quality. The DIAS32 system can be deployed in any array configuration at any scale, both in 3D and 2D. CVR allows for the computation of a dipole from any two electrodes across the survey area. This yields a rich, high volume data set that contains multi-azimuth and multi-scale dipoles. Most DIAS32 surveys yield data sets of several million possible dipoles.

Outcome

In the figure above, note the significant resolution difference between the DIAS32 resistivity survey model (top) and the 2D model (bottom). In several places the apparent geologic features and trends differ significantly in the two models.

In the image to the right, note the significant differences between the 2D and 3D models. The vertical sources at depth are known vertical conductive basement units.

DIAS32 CVR data sets provide accurate, high resolution models for confident interpretation and follow-up.