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The Effect of Argillaceous Rock Fabric on the Primary Migration of Oil

By
Neal R. O’Brien
Neal R. O’Brien
1
Geology Department, State University of New York, College at Potsdam, New York, 13676
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Marie D. Cremer
Marie D. Cremer
2
Phillips Petroleum Co., Bartlesville, Oklahoma 74004
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Dylan G. Canales
Dylan G. Canales
3
New Mexico Institute of Mining and Technology, Earth and Environmental Science Dept., 801 Socorro, New Mexico, 87801-4796
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Published:
January 01, 2003

Abstract

The effect of shale fabric on the primary migration of oil is seen through scanning electron microscope analysis of oil morphology and microfracture network in two oil source rocks. SEM micrographs of oil produced by hydrous pyrolysis experiments from two well known source rocks (the Devonian-Missisipian Woodford Shale, Oklahoma and the Jurassic Kimmeridge Clay Formation, Dorset, England) show the following sequence of initial oil formation and movement: (1) within the shale matrix oil is initially generated in the Woodford Shale at 350°C for 1 day heating and in the Kimmeridge Clay Formation at 300°C for 3 days heating; (2) initial oil generation and microfracture formation occur at the same stage; (3) oil droplets continue to move along a pressure gradient out of the matrix into adjacent open microfractures; and (4) ribbons of oil fill the microfractures and move along the fracture network. The primary migration phase through the source rock appears to continue as oil is expelled. These observations highlight the importance of the argillaceous microfabric in influencing the primary migration of oil.

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SEPM Miscellaneous Publication

Siltstones, Mudstones and Shales: Depositional Processes and Characteristics

Erik D. Scott
Erik D. Scott
Shell International Exploration & Production, 200 North Dairy Ashford, Houston, Texas 77079
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Arnold H. Bouma
Arnold H. Bouma
Dept. of Geology & Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803
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William R. Bryant
William R. Bryant
Dept. of Oceanography, Texas A&M University, College Station, Texas 77843
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SEPM Society for Sedimentary Geology
Volume
1
ISBN electronic:
9781565760943
Publication date:
January 01, 2003

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