The Second White Speckled Shale Formation, located in the Western Canadian Sedimentary Basin is Late Cretaceous (Cenomanian-Turonian) in age, and consists of finely interbedded siltstone and mudstone. Since the 1960s, the formation has produced oil and gas in unpredictable quantities. Understanding the lateral heterogeneity of the formation’s characteristics such as thickness, hydrocarbon saturation, total porosity, brittleness, clay volume, and TOC could potentially help to uncover causes for production variations. In this study, well logs and core data from 25 different wells were used to map petrophysical characteristics for the S member. Once distribution of these properties was determined, two methods were used to identify potential “sweet spots” for further drilling. The first method involved suggesting appropriate cut-off values for each property and establishing which areas lie inside all of the cut-off values for all properties. The second method was more complex and involved assigning a weight to each characteristic, solving for their “plot” values, and then contouring the Sweetness Index (SI) to locate sweet spots. The first method resulted in identifying two potential sweet spots (“A” and “B”). The second method resulted in contoured values for the Sweetness Index with a somewhat different area of highest potential. After comparing these sweet spots with production, it was concluded that the S member is indeed very heterogeneous, and there is either not a direct correlation of high production to areas with the best petrophysical attributes, or the current wells might not be in the optimum location as suggested by these sweetness maps.
|Commitee:||Borrok, David, Kinsland, Gary|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 56/01M(E), Masters Abstracts International|
|Keywords:||Second white speckled shale, Second white specks, Shale sweet spot, Sweet spot mapping|
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