Subsurface stratigraphic picks for the Milk River shoulder, Alberta Plains: including tops for the Milk River Formation and Alderson Member of the Lea Park Formation

Publication Type
Open File Report
Topic
Oil and Gas
Publication ID
OFR 2013-17
Publication ID Extended
Open File Report 2013-17
Publication
Publication Other
Abstract

This report provides the documentation to accompany a Digital Dataset of subsurface stratigraphic picks of the Milk River 'shoulder' in the Alberta Plains (Townships 1 to 73, Ranges 1W4 to 2W6) made from wireline geophysical well logs.

The Milk River 'shoulder' is an informal term often used to refer to a distinctive deflection on resistivity, sonic, density, and porosity logs. The Milk River 'shoulder' corresponds to the top of the Milk River Formation in southern Alberta, where it represents a juxtaposition of paralic deposits of the underlying Deadhorse Coulee Member of the Milk River Formation and overlying marine shale of the Pakowki Formation. It is characterized by a leftward deflection (decreasing resistivity) upwards across the contact, forming the distinctive log signature. To the north, the Milk River 'shoulder' represents the boundary between the Alderson Member (lower Lea Park Formation) and the upper Lea Park Formation (Pakowki equivalent). In these areas, silty sands and mudstones of the Alderson Member are overlain by shales of the upper Lea Park Formation.

Well data were screened to detect errors resulting from deviated wells, as well as incorrect ground and kelly bushing elevation data. We used statistical methods to identify local and regional statistical outliers, which we examined individually.

Citation

Glombick, P and Mumpy, A.J. (2014): Subsurface stratigraphic picks for the Milk River ‘shoulder,’ Alberta Plains: Including tops for the Milk River Formation and Alderson Member of the Lea Park Formation; Alberta Energy Regulator, AER/AGS Open File Report 2013-17, 23 p.

Place Keywords
alberta, canada
Place Keywords NTS
72e, 72l, 72m, 73d, 73e, 73l, 73m, 82g, 82h, 82i, 82j, 82n, 82o, 82p, 83a, 83b, 83c, 83d, 83e, 83f, 83g, 83h, 83i, 83j, 83k, 83l, 83m, 83n, 83o, 83p
Theme Keywords
alberta plains, bedrock geology, lea park formation, mapping, milk river formation, pakowki formation, stratigraphic picks, stratigraphy, subsurface mapping, upper cretaceous, well log signature