Porosity and Pore Networks in Tight Dolostone––Mudstone Reservoirs: Insights from the Devonian Three Forks Formation, Williston Basin, USA

Adedoyin Adeyilola; Stephan Nordeng; Qinhong Hu

doi:10.1007/s12583-021-1458-3

Volume 33 Issue 2

Apr 2022

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Journal of Earth Science > 2022 > 33(2): 462-481.

Adedoyin Adeyilola, Stephan Nordeng, Qinhong Hu. Porosity and Pore Networks in Tight Dolostone––Mudstone Reservoirs: Insights from the Devonian Three Forks Formation, Williston Basin, USA. Journal of Earth Science, 2022, 33(2): 462-481. doi: 10.1007/s12583-021-1458-3

Citation:

Adedoyin Adeyilola, Stephan Nordeng, Qinhong Hu. Porosity and Pore Networks in Tight Dolostone––Mudstone Reservoirs: Insights from the Devonian Three Forks Formation, Williston Basin, USA. Journal of Earth Science, 2022, 33(2): 462-481. doi: 10.1007/s12583-021-1458-3

Citation:

Adedoyin Adeyilola, Stephan Nordeng, Qinhong Hu. Porosity and Pore Networks in Tight Dolostone––Mudstone Reservoirs: Insights from the Devonian Three Forks Formation, Williston Basin, USA. Journal of Earth Science, 2022, 33(2): 462-481. doi: 10.1007/s12583-021-1458-3

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Porosity and Pore Networks in Tight Dolostone––Mudstone Reservoirs: Insights from the Devonian Three Forks Formation, Williston Basin, USA

doi: 10.1007/s12583-021-1458-3

1.
Department of Earth and Atmospheric Science, Central Michigan University, Mount Pleasant, MI 48859, USA
2.
Harold Hamm School of Geology and Geological Engineering, University of North Dakota, Grand Forks, ND 58202, USA
3.
Department of Earth and Environmental Sciences, The University of Texas at Arlington, 500 Yates Street, Arlington, TX 76019, USA

More Information

Corresponding author: Adedoyin Adeyilola, adeyi1a@cmich.edu
Received Date: 08 Nov 2020
Accepted Date: 18 Mar 2021
Publish Date: 30 Apr 2022

Abstract

Abstract

This study was performed to evaluate pore systems of reservoir lithofacies within the Devonian Three Forks Formation in the Williston Basin through micro-scale pore characterization. These lithofacies are from the Upper Three Forks section, which is a prominent drilling target within the Bakken-Three Forks Petroleum System. Samples from the Formation were examined by (1) physical core description, (2) petrographic thin section microscopy, (3) x-ray diffractometry (XRD) minerals analysis, (4) scanning electron microscopy (SEM), and (5) porosity measurements from helium porosimetry, nuclear magnetic resonance (NMR), gas adsorption and mercury intrusion porosimetry (MIP). These were done to provide better understanding of the local variations in pore structures and how such structures impact reservoir quality within the Three Forks Formation. Seven reservoir lithofacies were identified and described, including laminated lithofacies, massive dolostone, mottled dolostone, massive mudstone, mottled mudstone, mudstone conglomerates, and brecciated mudstone. Samples show a diverse variation in mineralogical composition, pore types, porosity, and pore-size distribution. Six types of pores were identified: interparticle, intercrystalline, intracrystalline, vuggy, microfractures, and mudstone microporosity. Dolostone-rich lithofacies have abundant dolomite and less siliciclastic minerals such as quartz, feldspar, and clays. They also have relatively low porosity and generally larger pore size. A general positive trend exists between porosity with clay minerals and feldspar, in contrast to a negative trend with dolomite, and no clear relationship with quartz content. Results from the gas adsorption analysis, NMR and MIP pore-size distribution confirm an abundance of macropores (> 50 nm in diameters) in dolostone dominated lithofacies while other lithofacies generally have abundant mesopores (2–50 nm).
- dolostone,
- mudstone,
- porosity,
- pores,
- clay minerals,
- dolomite,
- lithofacies,
- bakken-three forks petroleum system,
- petroleum geology

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References(109)

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