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Predictive model for fracture distribution and intensity in sandstone and carbonate reservoirs, Wertz and Lost Soldier fields, Wyoming

Conference ·
OSTI ID:6591871
The Tensleep Sandstone and Madison carbonate reservoirs at Wertz and Lost Soldier fields, a southern Wyoming, were the subject of a fracture distribution study as part of a tertiary development study. A fracture classification scheme for the reservoirs was developed, and foot-by-foot fracture description of 15 cores throughout the two fields were generated. The core fracture classifications and descriptions were digitized for computer use. A computer-generated second derivative map of the Tensleep structure accurately reflected fracture distribution as described from cores in both the sandstone and carbonate reservoirs. Computer-generated crossplots of number of fractures per foot vs. a variety of petrophysical rock parameters identified structural position and lithology as the key factors governing fracture distribution and intensity in the Tensleep and Madison reservoirs. The Schlumberger long-spaced sonic composite fracture identification log (CFIL) was compared to the quantitative core fracture descriptions. Once calibrated to core data, the CFIL showed excellent agreement with the foot-by-foot core fracture descriptions in both the Tensleep and Madison reservoirs, and can be used to identify field-wide variations in fracture distribution.
OSTI ID:
6591871
Report Number(s):
CONF-880301-
Country of Publication:
United States
Language:
English

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