Facies and diagenesis of Goen Limestone cyclothem (early late Desmoinesian), Concho and Runnels Counties, central Texas
Conference
·
· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
OSTI ID:5953780
The Goen Limestone (early late Desmoinesian) of Concho and Runnels Counties, central Texas, consists of three vertically stacked transgressive-regressive sequences, each cycle beginning with a thin clay-rich transgressive unit which passes upward into thick regressive limestones. The major porosity-forming process in the Goen Limestone was early leaching as a result of meteoric-phreatic lenses which migrated primarily in response to glacio-eustatic sea level changes. The dominant porosity-reducing processes included early cementation by equant nonferroan spar in a meteoric-phreatic environment and late stage saddle dolomitization in a deeper burial connate environment. Bladed high-Mg calcite, silica, equant ferroan spar, and anhydrite cements resulted in minor porosity occlusion. The hydrocarbon-producing regressive units (foraminiferal and bryozoan-rugose coral facies) underwent the most complex diagenetic histories and contain extensive secondary pores (algal molds, vugs, micropores, and open stylolitic pores), which contrasts sharply with the unleached, nonporous transgressive facies. The presence or absence of glacio-eustatically controlled, penetrating freshwater lenses, the distribution of green phylloid algae, and the extent of secondary pore-filling cementation were the major factors controlling reservoir capability of Goen facies.
- Research Organization:
- Southern Methodist Univ., Dallas, TX (USA)
- OSTI ID:
- 5953780
- Report Number(s):
- CONF-880301-
- Conference Information:
- Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) Journal Volume: 72:2
- Country of Publication:
- United States
- Language:
- English
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