Surficial geochemical case history 2: stratigraphic trap
| 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 |
In this case history, the client conducted a soil gas hydrocarbon survey along the trace of the seismic line to look for evidence of hydrocarbon microseepage from a seismically defined trap at CDP 1070 (Figure 18-6, left). Propane soil gas anomalies were detected at CDP 1070 and 1096. The wildcat well drilled at CDP 1070 resulted in a new field discovery. The geochemical lead at CDP 1096 was reevaluated seismically. After additional processing, a revised interpretation (right) also predicted porosity development there and coincident with the surface geochemical anomaly. A second productive well was drilled at CDP 1096.
This is a good example, illustrating how we can use surface geochemical data to evaluate a geophysical lead and a geochemical lead.
Anomaly map
Figure 1 is a seismic section and soil gas profile of a stratigraphic trap located at approximately depth::5,600 ft (1.5 sec) in the Cretaceous Escondido Sandstone in La Salle County, Texas.
See also
- Geochemical case histories
- Geochemical case history 1: structural traps
- Geochemical case history 3: Predrill–postdrill comparison
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