Geodynamics Worldwide collaborates with partners specialized in geochemical analysis for surface hydrocarbon identification.
Many petroleum basin show some type of surface hydrocarbon leakage, since seals are imperfect and hydrocarbons, driven by buoyancy, move mainly vertically through thousands of meters. Locally also lateral migration occurs.
Although, as other exploration methods, the discovery of a geochemical anomaly does not guarantee the discovery of commercially significant petroleum, it does establish the presence of hydrocarbons in the area of interest. The results, along with passive seismic results and other geological and geophysical data, can lead to a significant increase in new discoveries and a decrease in the number of dry holes.
Benefits of a successful geochemical exploration include:
- Direct detection of hydrocarbons and/or hydrocarbons induced changes in soil
- Documents the presence of a petroleum system
- Permits a fast and effective ranking of different leads or prospects within the same licence
- Provides results applicable both to structural and stratigraphic traps
- Have little or no environmental impact
Geodynamics Worldwide services include the collection of surface soil samples at minimum additional field costs in parallel to the passive seismic survey and their shipment for laboratory analysis. In a standard analysis, samples are analyzed for: Magnetic susceptibility (MS), High resolution soil spectral analysis (HRSSA), Extracted hydrocarbon analysis (EHA), Hydrocarbon content by UV-Vis spectroscopy, soil electrical conductivity (all indirect methods).
The survey is carried out by collecting surface samples of soil over the area of interest. The spacing of the grid depends on several factors, but it is mainly related to the client’s objectives: for green filed exploration the spacing (1 to 2 km) will be much sparse than for prospect appraisal (500 meters or even less).
No expensive sampling equipment is required. Minimal per sample cost allows for large inexpensive surveys.
Geochemical anomalies present themselves as halos or apical signatures. These anomalies are plotted on maps for each of the methods used in the analysis of the samples, in order to locate their position with respect to the investigated area.
After computing single anomalies and background for each method, all the methodologies are merged together by weighting each single geochemical parameter and eventually provide a hydrocarbon induced “Anomaly location map” for each area.