Photomicrographs - North Coles Levee Field (7 photos)

Well: NCL 487-29

FRAME T-7A. Stevens sandstone from North Coles Levee field (NCL 487-29, 9139'). Note poikilotopic, highly birefringent calcite cement. Field of view 1.05mm. Crossed Nicols.

FRAME 3-16. Stevens sandstone from North Coles Levee field (NCL 487-29, 9030'). Note partially albitized plagioclase (lower right), rhombic (lower right) and microcrystalline (upper right) carbonate cement, and coarse twinned plagioclase (top center and left center). Field of view 2.lmm. Crossed Nicols.

FRAME 3-17. Stevens sandstone from North Coles Levee field (NCL 487-29, 9091'). Note plagioclase grain in center which has been in part replaced by calcite (upper half) and in part dissolved (lower half). Calcite also appears as cement at left. Field of view 2.lmm. Crossed Nicols.

FRAME 3-18. Same field of view as frame 3-17. Note secondary porosity within skeletal plagioclase grain (light blue epoxy), traces of primary porosity (right), and calcite replacement (higher relief and twinkling appearance relative to plagioclase). Field of view 2.lmm. Plane light.

FRAME 3-19. Stevens sandstone from North Coles Levee field (NCL 487-29, 9091'). Note twinned plagioclase (center and top center), iron-stained carbonate (upper right) and pore-filling kaolinite (left center). Field of view 2.lmm. Crossed Nicols.

FRAME 3-20. Stevens, sandstone from North Coles Levee field (NCL 487-29 9139'). Note secondary porosity within plagioclase grain (center), even though calcite cement is extensive (upper right). Field of view 2.1mm. Crossed Nicols.

FRAME 3-21. Same field of view as frame 3-20. Note secondary porosity (blue epoxy) within plagioclase grain. Field of view 2.lmm. Plane light.