In conjunction with the seismic program, Gentech has conducted an advanced soil gas geochemistry survey to identify the composition and distribution of surface hydrocarbon seeps within Block XXXI-36. The survey was conducted by Exploration Technologies, Inc. ("ETI") of Houston, Texas, USA. The survey area is comprised of 1,790 square kilometers (shown in red outline below) and encompasses the entirety of Block 36 as well as an area north of the block to provide correlation with the reported oil shows in the 2G well located approximately 11 kilometers north of the block. A total of 1,700 samples were taken, representing 1 km X 1 km grid over the area, with some increased sample density over identified prospects.
ETI utilizes a proprietary four foot manual probe sampling system to collect free "mobile phase" soil gas samples over the survey areas. This shallow probe sampling technology provides a very cost-effective method for evaluating the overall prospectivity of the area and as an additional tool useful for high-grading specific prospect areas identified for drilling by other seismic and/or geologic methods. Regional soil gas samples placed on a grid yield results that will directly detect specific hydrocarbon accumulations along with providing information on the compositions (i.e. oil versus gas potential) of the anomalies. These specific and localized seeps will provide independent verification of mapped hydrocarbon traps, source rocks, maturity of those source rocks and potential migration fairways.
The sample locations are accurately located in the field using Global Positioning System (GPS) instruments. Soil gas samples are collected into evacuated 125-cc septum top serum bottles in the field. An ambient air blank is collected for quality control after every 10 samples.
The specially prepared sample bottles which are provided by ETI are sealed in the field and shipped to Exploration Technologies’ laboratory in Houston, Texas USA for analysis. Upon receipt in the laboratory, the samples are analyzed for C1-C4 (methane, ethane, ethylene, propane, propylene, iso-butane and normal-butane) hydrocarbons by computer controlled, flow-through, flame ionization detector (FID) gas chromatography. Samples are also analyzed for carbon dioxide by thermal conductivity detector (TCD) gas chromatography. Soil gas concentrations are calculated in parts per billion (ppb) by volume. The results of these analyses thus provide a detailed picture of the magnitudes, compositions and distributions of light hydrocarbon seepage over the study area.
Using ETI’s free "mobile phase" soil gas methodology, reproducible soil gas samples can be collected in phases over multiple seasons without creating any sampling artifacts. Multiple grids and infill to existing grids can be collected and intermixed for a final interpretation that can evolve as more samples are collected. ETI’s method is rapid, allowing a ETI sampling crew to easily collect about 30 samples per day per crew. With multiple collecting crews very large numbers are collected in a very short time period utilizing locally trained Kazakh personnel. No mechanized equipment is required, providing reasonable assess to both urban and remote areas. Samples can be manually collected anywhere that a man can walk.
Final analytical results obtained from the survey are then interpreted, mapped and merged into a report discussing the distribution and composition of light hydrocarbon seepage in the study area. This final report and the maps of surface hydrocarbon seepage by concentration and composition are available for review to authorized parties in the data room at RPS Scotia. Please contact PMD International to arrange a technical review.
For more information about Exploration Technologies, Inc. please review their website at www.eti-geochemistry.com
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