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The Bellshill Lake oil field, located in east-central Alberta, was discovered in 1956. The field represents a stratigraphic trap formed by updip (northeast) shale-out of a highly porous and permeable quartz sand within the Lower Cretaceous Mannville formation. A detailed lithofacies map of a 50-foot thick slice (including the productive unit) parallel with an overlying marker bed shows: (1) the updip limit of the productive sand is irregular, and (2) ridges of sand are built up on the upper surface of the main sand body and are responsible in part for maximum pay thicknesses. The field is overlain by a gas cap and underlain by water. The maximum oil pay thickness is 50 feet. Approximately 3,000 acres have been developed to date and primary recoverable reserves are estimat d at 40 million barrels of 27° gravity (API) oil.
The Thompson Lake field discovered in 1958 is a similar but smaller field and lies on trend southeast.
A new technique for determination of net permeable sand (in sand-shale sequences) from electric logs is presented. The technique involves: (1) analysis of drill-stem test and lithologic data, and (2) construction of a graph to correct the amplitude of the self potential (SP) curve for various mud resistivities.
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