Porosity evolution in Salem Limestone (Mississippian) of south-central Indiana
Conference
·
· Am. Assoc. Pet. Geol., Bull.; (United States)
OSTI ID:6001384
The Salem Limestone (Valmeyeran) is represented in Monroe and northern Lawrence Counties, Indiana, by a complex assemblage of bioclastic packstone-grainstones capped by dolomitic rocks. Modal analysis indicates intervals where porosity exceeds 20%. However, the evolution of this porosity is not well documented. Optical and cathodoluminescence petrography reveal primary porosity in coarse echinoderm-bryozoan and diverse-fauna grainstones. In the porous zones, cement occurs as (1) fibrous to sparry cement filling intragranular areas (foraminifer chambers and fenestrate bryozoan zooecia), (2) isopachous crusts on the exterior of polycrystalline and coated grains, (3) syntaxial rims on uncoated echinoderm grains, and (4) rudimentary syntaxial cement on bald spots where grain coats have been spalled by compaction. Porosity in analogous bioclastic grainstones composed of uncoated echinoderm fragments is thoroughly occluded with syntaxial cement. Cathodoluminescence reveals that rudimentary cement under spalled grain coats postdates the earliest cements on uncoated grains. From oldest to youngest, luminescence zonation for well-developed syntaxial rims progresses from nonluminescent, through dully luminescent, through brightly luminescent, to dully luminescent. The rudimentary syntaxial cement under spalled coats is commonly brightly luminescent. Tightly cemented, fine-grained, bioclastic packstone-grainstones overlie these porous intervals, apparently serving as aquacludes that prevented more thorough cementation. Secondary porosity also is common in the Salem Limestone and occurs as gastropod molds, vugs, and solution-enlarged fractures.
- Research Organization:
- Univ. of Missouri, Columbia
- OSTI ID:
- 6001384
- Report Number(s):
- CONF-850322-
- Conference Information:
- Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 69:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Development of reservoir facies and porosity-permeability compartmentalization in middle Mississippian Salem Limestone, eastern margin of the Illinois Basin
Anatomy of the grainstone shoal facies of the Salem Limestone (Mississippian) of southern Indiana
Faunas of Mississippian oolitic limestones: Evidence from Salem Limestone, southern Indiana
Journal Article
·
Fri Sep 01 00:00:00 EDT 1995
· AAPG Bulletin
·
OSTI ID:159959
Anatomy of the grainstone shoal facies of the Salem Limestone (Mississippian) of southern Indiana
Conference
·
Sun Feb 28 23:00:00 EST 1993
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:5018899
Faunas of Mississippian oolitic limestones: Evidence from Salem Limestone, southern Indiana
Conference
·
Tue Aug 01 00:00:00 EDT 1989
· AAPG Bulletin (American Association of Petroleum Geologists); (USA)
·
OSTI ID:5588726