GEOPHYSICAL CASE HISTORY OF THE HORSE CREEK FIELD, LARAMIE COUNTY, WYOMING

Geophysics ◽  
1960 ◽  
Vol 25 (3) ◽  
pp. 602-612
Author(s):  
Jack W. Peters
Keyword(s):  
Gravity Anomaly ◽  
Case History ◽  
Lower Cretaceous ◽  
Gravity Survey ◽  
Muddy Sand ◽  
Seismic Surveys ◽  
Cumulative Production ◽  
History Of

The Horse Creek field located in Laramie County, Wyoming, was discovered and developed by the General Petroleum Corporation following a reconnaissance gravity survey and preliminary and detail seismic surveys. The gravity survey, made during 1940, delineated a strong maximum gravity anomaly having a magnitude of about 5 mg. Limited seismic work was then conducted in the area during 1941 and 1942 and mapped a prominent anticline having some 2,000 ft of closure. In September, 1942, General Petroleum Corporation spudded in their No. 78-31-G well, located on the apex of the structure. This well was completed as the discovery for the field, producing from the lower Cretaceous‐Lakota sand. The second well, No. 74-6-P, was completed in April, 1943, as the lower Cretaceous‐Muddy sand discovery for the field. Further seismic work was done during 1944 and 1945 to detail and refine the structural picture. Subsequent drilling developed the Muddy sand as the primary producing zone in this field. A total of 32 producing wells has been drilled on this structure and to August, 1958, the total cumulative production from the field was 3,519,000 barrels of oil.

GEOPHYSICAL CASE HISTORY—BLACK HOLLOW FIELD, WELD COUNTY, COLORADO

Geophysics ◽  
1962 ◽  
Vol 27 (6) ◽  
pp. 994-1006
Author(s):  
E. J. Northwood
Keyword(s):  
Case History ◽  
Velocity Gradient ◽  
Lower Cretaceous ◽  
Subsequent Development ◽  
Gravity Survey ◽  
The West ◽  
Major Objective ◽  
A Minor ◽  
Structural Closure

The Black Hollow Field is located in Weld County, Colorado, on the west flank of the Denver‐Cheyenne Basin. The producing reservoir is the Lyons sandstone of Permian age. Seismic work was begun in the area in 1944, following up gravity leads resulting from a gravity survey done in 1943. A minor lead resulted, but it was not until 1949 when The California Company moved in a Western Geophysical crew for additional seismic work that structural closure was recognized. This led to the drilling of a well to test the Lower Cretaceous Dakota and Lakota sands, which were then the major objective. The well was abandoned in 1952. During the next year, interest increased in Permian objectives and the well was re‐entered and deepened to the Lyons, thereby becoming the discovery well at Black Hollow. Subsequent development drilling indicated anomalous thickening and stratigraphy on the west flank which led to more seismic work. Results indicated that this could be mapped. Furthermore, a velocity gradient across the area was recognized, and applying this, the possibility of extending the field to the east was recognized. More seismic work was done in an attempt to confirm this prior to additional drilling.

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Author(s):  
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Francesca Rinaldi ◽  
Gabriele Carpineta ◽  
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2011 ◽  
Author(s):  
Mohammed Jasem Al-Saeedi ◽  
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