Influence of diagenesis on porosity development in reservoir sandstones - an overview
Conference
·
· AAPG Bull.; (United States)
OSTI ID:5796712
The most prevalent diagenetic effect in sandstones involves porosity reduction by cementation and compaction. Overall, principal cementing agents consist of quartz, carbonate, and clay. Correspondingly, considerable porosity loss can be attributed to physical and chemical compaction by grain rotation, ductile grain deformation, and pressure solution. Commonly the development of detrital and authigenic grain coatings in quartzose sandstones has served to preserve (relative sense) intergranular pore space by inhibiting silica in pore waters from nucleating on detrital quartz surfaces as quartz overgrowths. Petrographic evidence suggests that clays, in particular chlorite, constitute the most common and important coating types affecting quartz cementation. Selective dissolution of detrital and authigenic mineral constituents has significantly increased porosity of many reservoir sandstones. Although considerable pore space may be attributed to chemical removal of carbonate as cement/mineral replacements, significant porosity enhancement can develop by direct dissolution of detrital framework constituents (e.g., feldspar, volcanic rock fragments). Although dissolution of silicate mineral components results in increased porosity, it does not necessarily result in enhanced permeability.
- Research Organization:
- Amoco Production Co., Tulsa, OK (USA)
- OSTI ID:
- 5796712
- Report Number(s):
- CONF-890404-
- Conference Information:
- Journal Name: AAPG Bull.; (United States) Journal Volume: 73:3
- Country of Publication:
- United States
- Language:
- English
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