--> ABSTRACT: An Integrated Exploration Model for the Muddy Sandstone at Riverton Dome Field, Wyoming, by Jane E. Estes-Jackson, John C. Webb, and Steven G. Siguaw; #90906(2001)

Datapages, Inc.Print this page

Jane E. Estes-Jackson1, John C. Webb2, Steven G. Siguaw3

(1) Consulting Geologist, Arvada, CO
(2) Consulting Geologist/Petrologist, Louisville, CO
(3) Consulting Geophysicist, CO

ABSTRACT: An Integrated Exploration Model for the Muddy Sandstone at Riverton Dome Field, Wyoming

Riverton Dome field is located on a north-plunging, fault-bounded anticline in the southwestern Wind River Basin, Wyoming. It has produced over 220 BCF of gas and 6 MBO from multiple reservoirs since its discovery in 1949. The Lower Cretaceous Muddy Sandstone has produced gas at this field since 1963. It was deposited as an incised valley-fill sequence above a lowstand surface of erosion near the top of the Thermopolis/Skull Creek Shale. In this study the Muddy Sandstone was informally subdivided into three members. The basal member was deposited within a fluvial channel belt in the lowermost portion of the valley-fill sequence and is the primary Muddy reservoir at Riverton Dome field. The middle and upper members were deposited following a subsequent marine transgression and are secondary reservoir targets. The Riverton Dome anticline has been active since the Paleozoic, and its position may have influenced the location of the fluvial channels within the basal member. Wells drilled on the north nose of the structure encountered thicker sandstones than those drilled near the crest of the structure.

A core through the Muddy Sandstone interval obtained from the SOCO Tribal #54 well, located on the north flank of the field, confirmed preliminary interpretations of depositional environment and allowed the determination of reservoir properties. Well control, including the core data, was integrated with a 3D seismic survey to create a predictive model for these productive basal Muddy channels. This integrated reservoir model of the basal Muddy Sandstone was used to project the productive trends beyond the historic limits of the field and resulted in the addition of 10-15 BCF of reserves to this mature field.

AAPG Search and Discovery Article #90906©2001 AAPG Annual Convention, Denver, Colorado