Transient Electromagnetic (TEM) - Land, Marine

ONYX provides Transient Electromagnetic (Land) services utilizing electromagnetic exploration techniques including and not limited to the followings:

Transient Electromagnetic (TEM)

The induction soundings of square-shaped currents from non-grounded loops form the basis of EM field sources and receivers. Investigation depth corresponds to decay time while the measured time is dependent on the summarized conductivity of sedimentary cover or the average value of electric resistance of layers.

Induced Polarization (EM-IP)

A galvanic current system utilizing grounded transmitters and receivers. IP anomalies of upper layers are caused by presence of altered geochemical zone above HC traps due to seepage of HC.

Combination of TEM and EM-IP allows the identification of promising zones of reservoirs with HC. This service is provided through collaboration with IERP of Russia.

Transient Electromagnetic Technique (Marine)

ONYX also offers offshore EM exploration services – using EM Streamer technique - the ultimate in exploration efficiency and risk mitigation. This technique uses a configuration of transmitter and receiver in a towed electric dipole (lines) where receiver unit fixed at receiver point thus only digitals signal transferred to the measuring system core (less noise interference). The system measured in time and frequency domain with offset length up to 12km. Besides, the technique Investigate resistivity as IP in upper part of the section. EM streamer system is substantially more productive than any nodal system and less cost versus conventional CSEM.

Ocean Bottom Cables (OBC) / Ocean Bottom Nodes (OBN)

Transition Zone Seismic

We, in partnership with SeismoShelf, are the pioneer in containerized nodal solutions for transition zone seismic surveys with a safe, rapid and cost effective mobilization, acquisition, retrieval and delivery of first class of seismic data. SeismoShelf designed and manufactured their own seismic node.

Hydrographic Survey

We also offer Hydrographic Survey of Side Scan Sonar and Multi-beam Echo Sounder surveys. These surveys could be applied in various activities of hydrography investigation. Hydrography is the science which deals with the measurement and description of the physical features of bodies of water and their littoral land areas. Special emphasis is usually placed on the elements that affect safe navigation and the publication of such information in a suitable form for use in navigation.

Surface Geochemical Exploration

Micro-seepage (active), usually interstitial gas, is often used to assess exploration acreage or exploration structures for their oil/gas potential - migrating gases have a strong tendency of vertical ascension along a micro-fracture network in the rock system. The presence and identification of subtle micro-gas seepage at the surface may be used as a direct indicator for reservoired HC vertically below.

We offer Surface geochemical Exploration service which is a technique based on the principal of oil and gas accumulations (and mature source rocks) having a surface geochemical expression. This hydrocarbon seepage can range from visible oil and gas seeps (macro seepage) at one extreme, to invisible but detectible micro seepage at the other extreme. The surface expression of hydrocarbon micro seepage can take many forms including

  • Microbiological anomalies
  • Anomalous hydrocarbon concentrations
  • Mineralogic changes such as the formation of calcite, pyrite, uranium, elemental sulphur, magnetic iron oxides and sulfides
  • Bleaching of redbeds
  • Clay mineral changes
  • Acoustic anomalies
  • Electrochemical changes
  • Radiation anomalies
  • Biogeochemical and geo-botanical anomalies

Significantly, the technique can reduce exploration risk by identifying the specific areas or prospects with the greatest petroleum potential. Surface geochemical exploration surveys can be beneficial at all stages of exploration: from frontier basin evaluation, to high-grading leads and prospects on basis of hydrocarbon charge, to identifying by-passed pay in mature fields.

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