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Authigenic Clay Mineral Distribution, Lower Tuscloosa Formation, Southwest Mississippi: Impact on Sandstone Reservoir Quality, North Hustler Field Area.

Meylan MA; Cameron CP; Patrick DM; Keith CD
For Reference Only At Bureau Libraries :82 pages
This research assesses the clay mineral distribution in terms of sandstone petrology, gross lithology, and depositional and diagenetic history; and compares the nature of lower Tuscaloosa diagenesis to that of other Gulf Basin Clastic Formations. Data from 256 x-ray diffraction (xrd) and 34 petrographic anaylses (pa) were added to a previously established data base. These new data were collected on a 1-ft interval from eight wells in this field; all had been previously logged and described, and additional xrd and pa data were available. Qualitative and quantitative xrd studies were undertaken to describe the clay minerlogy; percent porosity, framework grains, matrix, and cement were determined from point counting of thin sections. A literature search reviewed available information on Gulf Basin diagenesis. For all known samples, chlorite (c) abundance relative to other clays ranges from 5 to 92 pct (mean 54 pct), kaolinite (k) from 1 to 76 pct (mean 21 pct), illite (I) from 0 to 78 pct (mean 24 pct), and smectite (s) from 0 to 8 pct (mean 1 pct). Compositions of massive sandstones were: c, 67 pct; k, 15 pct; I, 17 pct; and s, 1 pct. For siltstones, c is 54 pct; k is 18 pct; I is 29 pct; and s is i1 pct. For undifferentiated shales and siltstones c is 15 pct; k is 47 pct; i is 38 pct; and s is 0 pct. Comparison of Lower Tuscaloosa and other Gulf Coast siliclastic diagenesis revealed more similarities than dissimilarities. All exhibit aspects of each diagenetic phase. Paragenesis is also similar.
Publication Date
Document Type
CP; Final Contract Report;
Fiscal Year
Identifying No.
OFR 49-90
NIOSH Division
Source Name
For Reference Only At Bureau Libraries
Performing Organization
Univ. of Southern Miss.
Page last reviewed: December 10, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division