Study of the Source Material, and Mechanisms of Generation, and Migration of Oils in the Anadarko Basin, Oklahoma. Progress Report

摘要

Detailed analyses were performed on 30 oils from the Simpson Group in the Pauls Valley area of the Anadarko Basin and it was concluded that 85% were derived from one common source and the remaining 15% from an alternative source. Examples of the sterane and triterpane biomarker fingerprints on which this conclusion was based are shown in Figs. 4a and b. A number of subtle differences are apparent between these two sets of chromatograms. Examination of the same classes of biomarkers from the Woodford Shale strongly suggested that the larger group of oils was derived from the Woodford Shale (Figs. 5a and b). The smaller group of oils was mainly reservoired in the Ordovician Viola Formation and an examination of the Viola shale extract showed a strong similarity between the biomarkers of the Viola oils and source rocks (Figs. 6a and b). This in turn would suggest that the Viola limestone could be acting as both a source and reservoir in this situation. This study is continuing with a more detailed investigation of additional classes of biomarkers such as the aromatic steranes and porphyrins plus examination of biomarkers from an additional variety of shales, namely the Morrow and Sylvan shales. (ERA citation 12:000066)