The Permian basin

Dolomitization of lower Permian platform facies, Wichita Formation, north platform, Midland basin, Texas

“…Although also of syndepositional origin, San Andres dolostones in the Palo Duro Basin, and parts of the northern Midland basin and Central Basin Platform formed in hypersaline, marinederived interstitial fluids (Handford and Wiggins 1981;Bein and Land 1983;Leary and Vogt 1986). Dominance of hypersaline dolostones in the San Andres, versus the lower Leonardian normal-marine dolostones described in this paper, likely reflects increase in evaporative conditions during the Permian (Hanson et al 1991). Whether all lower Leonardian dolomstones in the Permian Basin are of the type described here is a question that is beyond the scope of this investigation.…”

“…carbonate-siliciclastic depocenter surrounded by shallow-water carbonate platforms throughout Permian time (Hanson et al 1991). The lower Leonardian sequence on the North Platform of the Midland basin (Figures 1 and 2) consists of the Wichita and overlying Lower Clear Fork Formations with a total thickness of about 600 meters (Mazzullo and Reid 1989).…”

Play analysis and leading-edge oil-reservoir development methods in the Permian basin: Increased recovery through advanced technologies

“…Pennsylvanian carbonates deposited on the Central Basin platform and in the Midland basin ( Figure 5) compose the Pennsylvanian platform carbonate play. Atokan and Desmoinesian carbonates were deposited on low-relief ramps at a time of relatively low regional subsidence, whereas Missourian and Virgilian carbonates were deposited on higher relief carbonate platforms at a time of higher rates of regional subsidence (Hanson et al, 1991;Mazzullo, 1997). High-frequency glacioeustatic sea level fluctuations during the Pennsylvanian resulted in highly cyclic successions of shallow-water carbonate-platform facies (Heckel, 1986;Reid and Reid, 1999;Wahlman, 2001).…”

Predicting the natural state of fractured carbonate reservoirs: An Andector Field, West Texas test of a 3-D RTM simulator

“…Source rock is believed to exist in the Simpson Group (Katz et al 1994) and possibly in the Ellenburger Formation (Hanson et al 1991) on the Central Basin Platform. Since the Ellenburger Formation is also a reservoir, we have decided to include it as a source rock because of the following problems: a. there is the possibility of a vertical seal separating the Delaware Basin fiom the Central Basin Platform (Yang and Dorobek 1995); b. thus, our Andector study region does not include the Delaware Basin wherein the Ellenburger Formation is hown to be a source rock (Stahl and Carey 1975); A. thus, we neglected Delaware Basin Ellenburger and Simpson sourcing petroleum that migrated to Central Uplift reservoirs, i.e., the Ellenburger and Simpson in the Andector field did not receive any petroleum from the Delaware and (also by assumption) the Midland Basins; and c. the buoyancy of oil relative to water prevents oil migration downward fiom the higher lying Simpson Group source to Ellenburger reservoir, a further argument for Ellenburger selfsourcing.…”