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North Dakota Geological SurveyGeologic Investigations No.77

Edward C. Murphy, State GeologistLynn D. Helms, Director Dept. of Mineral Resources

LINEAMENT DENSITY AND GENERALIZED WELL PRODUCTION IN THE PARSHALL AREA, NORTH DAKOTA

µ

R. 94 W. R. 92 W.R. 96 W. R. 90 W.R. 98 W. R. 86 W.R. 88 W. R. 84 W.

T. 15

8 N.

48o 00 '

103o 00 ' 102o 00 '

T. 15

6 N.

T. 15

4 N.

T. 15

2 N.

T. 15

0 N.

T. 14

8 N.

R. 94 W. R. 92 W.R. 96 W. R. 90 W.R. 98 W. R. 86 W.R. 88 W. R. 84 W.103o 00 '

T. 15

8 N.

48o 00 '

T. 15

6 N.

T. 15

4 N.

T. 15

2 N.

T. 15

0 N.

T. 14

8 N.

102o 00 '

Fred J. Anderson2009

Figure 1. Averaged overall well produc tion per lineament density class (colored bars) on the primary y-axis shown with the total number of wellsoccurring within each lineament density c lass (i.e., produc ing and non-producing wells) shown on the secondary y-axis. Average production iscalculated as the average (Bbls) produced, over the first 12 months of production, divided by total number of wells drilled per lineament density c lass.The overall percent success rate is highlighted in red above each respective lineament class and is defined as the number of producing wellsdivided by the total number of wells drilled within each lineament density class.

EXPLANATION

Cartographic Compilation and GIS Analysis by Elroy L. Kadrmas

This map presents the results of an evaluation of the relationship between lineament density (Anderson, 2008) and overall generalized well production and success. The Parshall area is located in the northeastern portion of the Williston Basin and is centered around Mountrail County in northwestern North Dakota. Lineament density was calculated across the map area by automated analysis of the sum of all mapped lineament lengths found to occur within a 1 mile x 1 mile grid cell coincident with actual Public Land Survey System (PLSS) sections. Cellular lineament density values (i.e., total lineament line length per unit cell) were assigned to each of the grid cells. Lineament density classes are depicted on this map as ranging from areas of lower lineament density, shown as cooler colors, to areas of higher lineament density, shown as warmer colors. This map shows area of higher lineament density in the western portion of the map area, coincident with major subsurface structural development along the Nesson Anticline and lessened geomorphological influence from Pleistocene glaciation. Areas of lower lineament density are found in the eastern and northeastern portions of the map. Overall, lineament density appears greatest in areas where producing oil and gas wells are commonly located, and lower where non-producing wells have been drilled (Figure 1). This suggests a relationship between productive areas and relatively higher lineament density. Lineament density appears artificially lower in the areas covered by Lake Sakakawea as these water covered areas were not included during the original lineament mapping. The distribution of wells found within individual lineament density classes suggests that more dry wells have been drilled in areas of lower lineament density. Averaged production data suggest that wells located in areas of greater lineament density have generally higher overall average production. In terms of exploration success (i.e. near or greater than 50%), wells drilled in areas of higher lineament density have generally been more successful. Well data within this area of investigation and presented here, includes production information only from wells drilled before 09/20/08.

REFERE NCES

Anderson, F.J. , 2008, Lineament Mapping and Analysis in th e No rtheas tern Wil lis ton Basin o f N orth Dakota, No rth Dakota Geolo gical Su rv ey: Geologic In ves tigat ionsNo. 70, 26 p.

ND Oil & Gas Div ision, 2008 , Risk-Based Data Manag ement System (RBDMS), ht tps: //www.dmr.nd.g ov/oi lgas/subscript ionservice.asp

Lineament Density (ft/mi2)

14,000 - 18,000

12,000 - 14,000

10,000 - 12,000

8,000 - 10,000

6,000 - 8,000

4,000 - 6,000

2,000 - 4,000

0 - 2,000

!( Producing Drill Hole

Geologic Features

U Oil & Gas Fields

!( Non-Producing Drill Hole

Lake Sakakawea Boundary

Other Features

Nesson Anticline

The map area is a constructed 250k sheet. Belden, Belden SE,Belden SW, and Sikes Dam are the four center 24k quadrangles.

0 5 10 15 20

Miles

0 5 10 15 20

Kilometers

Scale 1:250,000

Standard parallel 47o 22' 30" Central meridian 102o 07' 30"Merca tor Projection 1927 Nor th American Datum