Passive Seismic Tomography (PST)


Passive Seismic Tomography (PST) is a technique to image the subsurface of the earth. PST is similar to a CAT scan of the human body, but instead of using X-rays, we use the elastic waves generated by microearthquakes as our energy source. Microearthquakes occur any where in the earth where the background stress field has been perturbed even to a small degree such that data from a producing zone can be imaged from the surface using a well designed seismic network. Any moderately tectonically active region can be imaged using PST, where as a traditional 3D-seismic reflection survey may be impossible. Data collection happens over the course of a few weeks to months (depending on the level of activity in the area). PST is not a new technique and is well established; but only recently started to be used in the oil, gas, and mining industries to image the subsurface.

With PST, we can produce a complete 3D tomography image of the P and S wave velocity beneath the network once enough data have been collected. In addition, we can compute Vp/Vs ratios and hence Poisson's ratio to establish the presence of fluids or geothermal activity within the zone of interest. We can provide equipment and expertise to you with a complete end-to-end PST solution.

      Energy Source of PST:
    1. 2D and 3D Reflection and Refraction surveys use blasts or vibraseis as the energy source.
    2. For PST, microearthquakes are the energy source.
    3. Earthquakes are located by a dense array of seismic stations running continuously over the target area.
    4. Earthquakes have broader frequency range than active source, and needs better seismometers.
    5. LIMITATION: only active tectonic regions or sites with induced seismicity can be imaged.

      Results :
    1. 3D P and S wave velocity model beneath the network.
    2. Vp/Vs - Poisson's ratio to determine geophysical properties of the target area.
    3. Refined earthquake locations on active faults - using double difference technique.

We collaborate with experience geophysical software development and research company in US, Instrumental Software Technologies, Inc. to help us with the high quality analytical services.

Our strategic partnership :


Surface Geochemical


Surface geochemistry is a low-cost effective method for screening large exploration areas, prospect ranking, and development drilling in order to reduce exploration risk, localize seismic survey area and validate high-grade seismic anomalies, "Do structures contain hydrocarbons or water ?".
The analytical results combined with other geological and geophysical data can be a guideline to determine potential area in exploration and development of petroleum and mineral resources program.

Our mission is to provide high quality and reliable data to enhance the confidence in both exploration and development stage of petroleum and mineral resources.

      Services :
    1. VaporTec Passive Soil Gas
    2. HTTD Soil Gas Hydrocarbons (C6 - C20) by GC/MS
    3. Fixed Gas (He, H2, N2, Ar, Ne, O2, CO2, CO, H2S)
      by GC/MicroTCD
    4. Synchronous Scan Fluorescence (SSF, C6 - C35 Range)
    5. Other geochemical analysis related to hydrocarbon sources.

We collaborate with worldwide experience geochemical survey company in US namely Vista Geoscience to help us with the high quality analytical services. All the sample will be conducted by Noras Nusantara and shipped to Vista Geoscience’s Laboratory for analytical services.

Our strategic partnership :