Subsurface study and hydrocarbon potential of the lower cretaceous hill producing zone, Sentell-Honore Field, Caddo and Bossier Parishes, Louisiana



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The Lower Cretaceous Hill producing zone limestone of the Rodessa Formation is defined as the stratum between 5,656 and 5,668 feet on the electric log of the Huggs Inc., Pittman No. 2 well (Sec.1, T18N, R14W) in the Sentell-Honore Field in Caddo and Bossier Parishes, Louisiana. The primary limestone rock types present in the zone are "oobio" limestones and "biopel" limestones with textures ranging from wackestones to packstone/ grainstones. Sedimentary textures, biogenic components, petrophysical log data, and sediment geometry indicate that the Hill zone was deposited in a shallow-marine environment as a poorly winnowed ooid shoal with associated wackestone and wackestone/packstone shoal flank facies. Isopach maps of the zone indicate a northnorthwest to south-southeast depositional strike, with the productive area of the ooid shoal complex being approximately 5 miles in length and 1 to 2 miles in width. After deposition of the Hill zone, the sediments underwent a series of diagenetic alterations occurring in the eogenetic (early) and mesogenetic (late) stages. During eogenetic diagenesis, there were four events: 1) micritization of aragonitic lime mud and development of micrite envelopes; 2) dissolution of allochems; 3) cementation in pore spaces by ferroan calcite in the form of scalenohedra, blocky equant spar, and epitaxial cement; and 4) cementation in pore spaces by ferroan dolomite. Mesogenetic diagenesis events include: 1) stylolitization; 2) replacement of micrite in stylolites by ferroan dolomite; and 3) cementation in pore spaces by anhydrite and replacement of matrix by anhydrite. The dissolution process served to enhance the reservoir porosity, while the cementation processes occluded both primary and secondary pore spaces. The highest porosities are developed in the oobiopackstone/grainstones where in addition to intergranular porosity there is fossil moldic, hollow micrite envelope, and pin-point vug porosity due to dissolution. The trap in the Sentell-Honore Field is a combination structural stratigraphic trap formed by the updip loss of porosity on the flank of a southeast plunging anticlinal "nose" associated with the Pine Island Salt Dome to the northwest. The Hill zone is only productive in the SentellHonore Field located in the southern half of the study area. Since the first production in May 1987, the Hill producing zone has produced 3,936,448 MCF (thousand cubic feet) of gas and 19,510 bbls. (barrels) of condensate as of May 1990. Estimated ultimate recovery figures, coupled with present economic conditions, indicate that further development within the Sentell-Honore Field would be uneconomical.



Sedimentation and deposition -- Louisiana