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Petro-Find Geochem Ltd has conducted numerous soil gas surveys in both Canada and the USA, but the reports of those surveys are regarded as highly confidential by industry and thus, they are not available for general distribution. The highly competitive nature of the oil/gas/uranium exploration industries precludes release of this information because of various factors. For example, if a soil gas survey reveals that a major anomaly trends beyond the property borders, the company may wish to acquire the adjacent property at the most reasonable cost possible.
August 2010 environmental study. This report is about a soil gas survey conducted during summer to monitor a portion of the Saskatchewan Weyburn Oil Field undergoing CO2EOR for any leakage of CO2 and hydrocarbons.See page for further discussion.
February 2011 environmental study.This report is about a soil gas monitoring survey conducted in winter over the same area as the August 2010 monitoring survey. Based on a review of other monitoring surveys and our experience in soil gas surveys, the following are recommended to assure good results and avoid major pitfalls: (1)Make sure soils around all active and abandoned wells are sampled because they can provide fast-flow conduits to the surface for CO2; (2)Conduct both summer and winter surveys over the same area and compare the results; (3)Avoid excessive vacuum and high-flow internal pumps in sampling (syringe method is best) to avoid contamination by ambient air; (4)Avoid taking large samples in tight soils to avoid contamination by ambient air; (5)Take samples at least 0.75 meters below ground level to avoid contamination by methane and CO2 produced in biologically active layers; (6)Wait at least 2 days after a heavy rain for sampling to allow regeneration; (7)Analyze soil gas for CO2 as well as C1-C5 hydrocarbons (plot of methane and ethane establishes whether methane is thermogenic or biogenic); (8)Employ passive samplers for wet areas which could be surface traces of faults that allow fast-flow of CO2 to the surface; (9)Avoid closed chamber methods because they measure concentrations and fluxes of both biogenic and anthropogenic (i.e.injected) CO2; (10)Conduct soil gas surveys in a wide swath around a reservoir undergoing COEOR because CO2 leakage can move laterally along faults; (11) Conduct lineament studies and baseline surveys to ascertain suitability of oil reservoirs for Enhanced Oil Recovery by CO2 injection to avoid possible CO2 leakage problems.
The Elements of a Cost-Effective Geochemical Soil Gas Survey-Application for Oil and Gas Exploration.
Cost-Effective Helium and Hydrogen Surveys in Uranium Exploration.
Geochemical Soil Gas Surveys, Cost-Effective Exploration with Low Risk . Geochemical Soil Gas Surveys are cost effective for grass roots exploration and revitalization of mature/abandoned oil fields.
PETRO-FIND GEOCHEM LTD
215 Mallin Crescent
Saskatoon, Saskatchewan, Canada S7K 7X3
Contact: Paul Lafleur, President
Phone: (306)931-3156 Fax: (306)931-9773
E-Mail: plafleur@sasktel.net