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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 66 (1982)

Issue: 5. (May)

First Page: 547

Last Page: 548

Title: Stanley Field, North Dakota, Economic and Quantitative Significance of Mechanically Compacted Shallow-Water Limestone: ABSTRACT

Author(s): David K. Beach, Ann L. Schumacher

Article Type: Meeting abstract


Stanley field, producing from the Mississippian Mission Canyon Formation in the east-central Williston basin, establishes the economic significance of shallow subsurface mechanical compaction of shallow-water Previous HitmarineNext Hit limestone, and provides a quantitative measure of mechanical compaction with increasing depth of burial.


In the field the upper 65 m of the Mission Canyon is formed of subtidal Previous HitmarineNext Hit and intertidal-supratidal island facies. Previous HitMarineNext Hit facies escaped pervasive early cementation and were significantly compacted. Evidence of mechanical compaction of Previous HitmarineNext Hit facies in cores include: (a) horizontal aspect of mottling (burrows); (b) horizontal orientation of fossil fragments; (c) drag, drape, and penetration effects; (d) microstylolitic "horsetail" swarms; and (e) broken and crushed fossils (ostracods, trilobites, corals, and crinoids). Island facies, syndepositionally cemented by both fibrous Previous HitmarineNext Hit (beach rocklike) and equant spar (freshwater) cements, show no evidence of significant mechanical compaction.

Compacted Previous HitmarineNext Hit mudstone and wackestone form the updip seal for the field. Preserved primary interparticle porosity in compacted Previous HitmarineNext Hit grainstone and packstone provides the principal reservoir facies.

Structure and isopach maps of various intervals of the Mission

End_Page 547------------------------------

Canyon and overlying Charles Formations, in conjunction with cross sections through the field showing both formations, reveal timing of compaction and quantitative compensation by overlying deposits. Curves from 3 wells show percent compaction versus overburden. With 250 m of overburden, mechanical compaction is essentially complete and, on average, Previous HitmarineTop sections have been compacted 31%.

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