We survey for better life

We provide electrical and electromagnetic surveys to explore the Earth. Our services are all in once. The feasibility study explains which techniques best suit for your survey. Field design provide you best way to get quality data to fulfill the aim of your exploration. Data acquisition, data processing and inversion, all are performed with modern instruments and new innovated technology. 2-D and 3-D resistivity models are linked with geology of the area to provide finest interpretation responding to the aim of the exploration.

Currently we serve Magnetotelluric (MT) survey, Transient electromagnetic (TEM) survey, and the Direct Current Resistivity (DCR) survey (or Electrical Resistivity Imaging (ERI), Electrical Resistivity Tomography (ERT) survey).

Many of our works are published in well-knowns scientific journals. This has guarantee scientifically correct and international standard.

Direct Current Resistivity (DCR survey)

The Direct Current Resistivity (DCR) survey is a technique utilizing two electrodes to inject an electrical current to the ground and another two electrodes to measure the voltage response at the surface. The ratio of the voltage and current yield electrical resistivity which will be linked for the interpretation. For 1-D exploration, the technique is usually referred to as the vertical electrical sounding (VES) relying mostly to the four electrodes configurations. Modern equipment allows multi-electrodes to align into a profile and use a computer system to acquire a profile or 2-D data automatically to yield a cross section of resistivity profile. This 2-D DCR technique is fast, reliable and usually referred to as the Electrical Resistivity Tomography (ERT) or Electrical Resistivity Imaging (ERI). Collecting data from many profiles in different directions, this allows us to produce the 3-D resistivity model.

The DCR survey is used mostly for shallow survey (few tens meter to less than a hundred meter). Its applications are (shallow) ground water exploration, cavity survey, tracing (shallow) hot spring reservoir, fault study, environment and engineering applications. Our lab is unique as we have developed and benchmark our processing and inversion software for all kinds of the DCR survey (1-D, 2-D and 3-D). This allows us a full strength for feasibility study and forward tests to optimally gain the best results. Here are some examples of our field surveys conducted in Thailand.

 

A section of the 3D resistivity modelfrom a 3-D cavity detection survey, northern Thailand.

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2D resistivity section

showing graphitic fault system in Canada from our 2-D joint inversion of MT and DCR data

References:

• Puwis Amatyakul, Chatchai Vachiratienchai, Weerachai Siripunvaraporn, 2017, WSJointInv2D-MT-DCR: An efficient joint two-dimensional magnetotelluric and direct current resistivity inversion, Computers and Geosciences, 102, 100 – 108.
• Chatchai Vachiratienchai and Weerachai Siripunvaraporn, 2013, An efficient inversion for two-dimensional direct current resistivity surveys based on the hybrid finite difference-finite element method, Physics of the Earth and Planetary Interiors, 215, 1-11.
• Ananya Satitpittakul, Chatchai Vachiratienchai, and Weerachai Siripunvaraporn, 2013, Factors influencing cavity detection in Karst terrain on two-dimensional (2-D) direct current (DC) resistivity survey: A case study from the western part of Thailand, Engineering Geology, 152, 162-171.
• Ananya Satitpittakul, Chatchai Vachiratienchai, and Weerachai Siripunvaraporn, 2013, Factors influencing cavity detection in Karst terrain on two-dimensional (2-D) direct current (DC) resistivity survey: A case study from the western part of Thailand, Engineering Geology, 152, 162-171.
• Vachiratienchai, C., S., Boonchaisuk, and Siripunvaraporn, W., 2010, A hybrid finite difference – finite element method to incorporate topography for 2D direct current (DC) resistivity modeling, Physics of the Earth and Planetary Interiors, 183 (3-4), 426-434.

For MT survey*, a cost depends mainly on the number of deployed MT stations. For a full service from feasibility study, field design, data acquisition, data processing, inversion and interpretation for a broadband MT (BBMT) survey, one site costs around 120,000THB. However, a full cost of a whole survey is significantly dropped when number of stations increasing. In addition, if the aim of the exploration is only for shallow (a few hundred meter) depth, a high frequency MT (HFMT) survey is conducted. The cost of the HFMT is around 40% dropped from the BBMT survey.

For ERT or ERI survey*, one profile survey (48 electrodes; up to 5 meter spacing) costs around 35,000THB. This cost is for a full-service including feasibility study, field design, data acquisition, data processing, inversion and interpretation. A discount up to 40% off is usually provides when requiring more number of profiles and/or less spacing.

* Survey cost is subjected to change. All costs are negotiable especially for large project.

Aim of the exploration and survey area are required to obtain the quotation cost.