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Environmental BioTechnologies, Inc. |
Correlation with 3D seismic supported Horizontal Drilling
Silverton Area, Saskatchewan Canada
T3, R32, W1Introduction
In October of 1995, EBT conducted a Microbial Exploration Technology (MET) geochemical surface survey over a 36 sq. mi. area in Silverton (T3 R32 W1). The MET survey showed large areas of potential hydrocarbon deposits (see % Probability of Success Contour Map) in the northwestern portion of the township, extending beyond the two fields that were in production at the time of the MET survey. It is estimated that 16 square miles of 3D seismic were shot in support of over 24 horizontal wells that were subsequently completed in these two fields. The two companies conducting this drilling, Numac and Maxx, did not have knowledge or access to the MET survey data. EBT believes that the selection of drilling sites and resulting production in the Silverton area correlate very well with our MET survey.
Correlation of MET Survey with Drilling Results
EBT had identified two locations of high interest in the Silverton area which were associated with the older production areas. The first highlighted area involves Numac field in the southern portion of sections 27 and 28 and the northern portion of sections 21 and 22. The second highlighted area covers the western portion of section 29 and the eastern portion of section 30 and portions of section 31. The most productive horizontal was drilled directly through the high MET signal strength area in sections 22 and 27 (See %PS map) and has a cumulative production of 367,127 bbl. and an average production of 420 bopd (see Table 1). This well was the highest %PS rated well. In the same field, Numac drilled the second best well along the northern flank of our signal strength area. This well averaged 177 bopd. The attached transparency has a proportioned dot placed in the middle of each horizontal to indicate its average daily production. It can be seen that the wells to the south of our signal strength dropped off in production, with rates averaging around 40–50 bopd.
In the Maxx developed field in the nw corner of the township, we again see that higher production, 60-105 bopd is associated with the horizontal wells running through the northern portion of our high MET signal strength area. The southeastern most well, running off our MET signal strength area, averaged only 13 bopd. Other wells in the north and northwest, off our signal strength, produced at 12-20 bopd, whereas those wells crossing our signal strength had average production of 50-102 bopd.
Table 1 Individual Well Statistics and Recommendations
Well Location %PS Recommendation Cum. Production Ave BOPD 4-27-3-32-1 52 Recommended 367,127 420 4-27-3-32-1 44 Recommended 38,052 42 16-30-3-32-1 44 Recommended 110,120 96 16-30-3-32-1 44 Recommended 58,622 53 13-29-3-32-1 41 Not Recommended 9,589 11 4-33-3-32-1 31 Not Recommended 17,436 19 4-22-3-32-1 29 Not Recommended Dry 4-22-3-32-1 16 Not Recommended Dry 13-31-3-32-1 13 Not Recommended Dry Note: EBT rates wells only if there is a minimum of 3 sample points in the near vicinity of the drill location. Due to the sampling density of this survey, we were not able to rank all the horizontals that were drilled in the area. The %PS contour map can be used to indicate areas of high MET signal strength, but we do not use this to rank individual well locations.
Summary
Overall, wells that were drilled through areas of high MET values were 2.5 times more productive, having an average production of 102 bopd while those that were off target had an average production of 39 bopd. The Silverton area MET survey proved to correlate very well with oil from horizontal wells. Most of the wells drilled by Maxx and Numac would have been recommended by the MET survey. However, five wells would not have been recommended and they averaged between 12 and 44 bopd.
In addition to this Silverton area survey, EBT has other example surveys in SE Saskatchewan (T1-2 R1-3 W2) and Flinton (T11 R6 W2) that correlate well with drilling results. The SE Saskatchewan survey showed that wells recommended by MET surveys had a 70% higher average production than wells that were not recommended. In the Flinton survey, EBT recommended wells had an average production that was 29% higher than non-recommended wells. The 12 MET recommended wells, out of 17 completed wells, produced 87% of the total oil for this set of wells.
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Environmental BioTechnologies, Inc.
255C S. Guild Ave.
Lodi, CA 95240
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