Difference between revisions of "Surficial geochemical case history 1: structural traps"
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| + | {{Merge|Surficial geochemical case histories}} | ||
{{publication | {{publication | ||
| image = exploring-for-oil-and-gas-traps.png | | image = exploring-for-oil-and-gas-traps.png | ||
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| part = Predicting the occurrence of oil and gas traps | | part = Predicting the occurrence of oil and gas traps | ||
| chapter = Surface geochemical exploration for petroleum | | chapter = Surface geochemical exploration for petroleum | ||
| − | | frompg = 18- | + | | frompg = 18-21 |
| − | | topg = 18- | + | | topg = 18-21 |
| author = Dietmar Schumacher | | author = Dietmar Schumacher | ||
| link = http://archives.datapages.com/data/specpubs/beaumont/ch18/ch18.htm | | link = http://archives.datapages.com/data/specpubs/beaumont/ch18/ch18.htm | ||
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| isbn = 0-89181-602-X | | isbn = 0-89181-602-X | ||
}} | }} | ||
| − | Meyer et al.<ref name=ch18r27>Meyer, W., T., Lovell, J., S., Hale, M., 1983, Detection of concealed mineral and energy resources by vapor geochemistry, in Thornton, I., Howarth, R. J., eds., Applied Geochemistry in the 1980s: London, Graham and Trotman, p. 86–102.</ref> published an excellent but little-known case history documenting vertical migration and microseepage from undisturbed structural traps. In the early 1980s, a series of microseepage surveys were conducted over 49 proposed well locations in Kansas and Colorado. | + | Meyer et al.<ref name=ch18r27>Meyer, W., T., Lovell, J., S., Hale, M., 1983, Detection of concealed mineral and energy resources by vapor geochemistry, in Thornton, I., Howarth, R. J., eds., Applied Geochemistry in the 1980s: London, Graham and Trotman, p. 86–102.</ref> published an excellent but little-known case history documenting [[Surficial geochemical exploration principles|vertical migration and microseepage]] from undisturbed structural traps. In the early 1980s, a series of microseepage surveys were conducted over 49 proposed well locations in Kansas and Colorado. |
==Sampling== | ==Sampling== | ||
| Line 21: | Line 22: | ||
==Survey vs. drilling results== | ==Survey vs. drilling results== | ||
| − | [[file:surface-geochemical-exploration-for-petroleum_fig18-5.png| | + | [[file:surface-geochemical-exploration-for-petroleum_fig18-5.png|300px|thumb|{{figure number|1}}Ten representative seismic prospects surveyed and later drilled. Based on Meyer et al.<ref name=ch18r27 /> Copyright: Barringer Technologies Inc.]] |
| − | When compared with the subsequent drilling results, the soils overlying productive reservoirs contained microbial populations that were readily distinguishable from those of samples that were collected from nonproductive sites. The 39 wells subsequently drilled yielded three producers, three wells with uncommercial shows, and 33 dry | + | When compared with the subsequent drilling results, the soils overlying productive reservoirs contained microbial populations that were readily distinguishable from those of samples that were collected from nonproductive sites. The 39 wells subsequently drilled yielded three producers, three wells with uncommercial shows, and 33 [[dry hole]]s. The microbial survey correctly predicted all 33 dry holes and identified the three producing wells and two of the three wells with uncommercial shows. The one show well that was not recognized tested 9 BO/D with a very low gas-oil ratio (GOR). |
| − | [[:file:surface-geochemical-exploration-for-petroleum_fig18-5.png|Figure 1]] illustrates ten representative seismic prospects surveyed and later drilled. Each prospect displays good four-way dip closure on a Cretaceous horizon, and each is located in a productive basin. Only one was associated with a surface geochemical anomaly; it was the only one of the ten shown that resulted in a commercial discovery. | + | [[:file:surface-geochemical-exploration-for-petroleum_fig18-5.png|Figure 1]] illustrates ten representative seismic prospects surveyed and later drilled. Each prospect displays good four-way [[dip]] closure on a [[Cretaceous]] horizon, and each is located in a productive basin. Only one was associated with a surface geochemical anomaly; it was the only one of the ten shown that resulted in a commercial discovery. |
| − | |||
==See also== | ==See also== | ||
| Line 43: | Line 43: | ||
[[Category:Predicting the occurrence of oil and gas traps]] | [[Category:Predicting the occurrence of oil and gas traps]] | ||
[[Category:Surface geochemical exploration for petroleum]] | [[Category:Surface geochemical exploration for petroleum]] | ||
| + | [[Category:Treatise Handbook 3]] | ||
Latest revision as of 22:29, 31 January 2022
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It has been suggested that this article be merged with [[::Surficial geochemical case histories|Surficial geochemical case histories]]. (Discuss) |
| Exploring for Oil and Gas Traps | |
| |
| Series | Treatise in Petroleum Geology |
|---|---|
| Part | Predicting the occurrence of oil and gas traps |
| Chapter | Surface geochemical exploration for petroleum |
| Author | Dietmar Schumacher |
| Link | Web page |
| Store | AAPG Store |
Meyer et al.[1] published an excellent but little-known case history documenting vertical migration and microseepage from undisturbed structural traps. In the early 1980s, a series of microseepage surveys were conducted over 49 proposed well locations in Kansas and Colorado.
Sampling[edit]
Soil samples were collected at one-tenth-mile intervals within one-half mile of each proposed drilling site and analyzed for the presence of hydrocarbon-oxidizing microbes. All samples were collected and analyzed prior to drilling, and the results were placed in escrow until after the wells were drilled.
Survey vs. drilling results[edit]
When compared with the subsequent drilling results, the soils overlying productive reservoirs contained microbial populations that were readily distinguishable from those of samples that were collected from nonproductive sites. The 39 wells subsequently drilled yielded three producers, three wells with uncommercial shows, and 33 dry holes. The microbial survey correctly predicted all 33 dry holes and identified the three producing wells and two of the three wells with uncommercial shows. The one show well that was not recognized tested 9 BO/D with a very low gas-oil ratio (GOR).
Figure 1 illustrates ten representative seismic prospects surveyed and later drilled. Each prospect displays good four-way dip closure on a Cretaceous horizon, and each is located in a productive basin. Only one was associated with a surface geochemical anomaly; it was the only one of the ten shown that resulted in a commercial discovery.
See also[edit]
- Surficial geochemical case histories
- Surficial geochemical case history 2: stratigraphic trap
- Surficial geochemical case history 3: Predrill–postdrill comparison
References[edit]
External links[edit]
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