Middle Miocene Stratigraphic Traps, Southeast Manila Village Field, Louisiana
THORN, KANDY L., and ROD A. NORVELL, Louisiana Land and Exploration Company, New Orleans, LA, and GEORGE C. FLOWERS, Tulane University, New Orleans, LA
Southeast Manila Village field, Louisiana, produces from two middle Fleming Group sandstones at depths ranging from 11,400 to 12,000 ft. Hydrocarbon production occurs mainly by a pressure depletion mechanism, and a waterflood has been initiated. A total of 14 wells have been drilled to date, and ultimate recovery from the field is estimated to be 4609 MBO and 3267 MMCFG.
Thin sand bodies, designated as the 28 and 29 sands, occur in a shale interval, which ranges in thickness from 500 to 600 ft. The reservoir rocks are thinly laminated, moderately to well sorted, and very fine-grained sands. Thin sand laminations have sharp lower contacts with the interbedded shales, indicating episodic deposition. Foraminiferal assemblages indicate that the sands were deposited in 100 to 400 ft of water. The sands are probably the result of turbidity flow deposition in a distal-delta environment.
Diagenetic reactions are, in part, responsible for the accumulation of hydrocarbons in the sands. Dissolution of primary calcite cement
and detrital K-feldspar grains has generated secondary porosity in the sands. Precipitation of authigenic minerals, such as chlorite, pyrite, siderite, kaolinite, illite, and mixed-layer clays, has, however, influenced primary and secondary oil recovery. Migration and accumulation of hydrocarbons apparently halted secondary cementation by inhibiting the precipitation of authigenic clays.
AAPG Search and Discovery Article #91006 © 1991 GCAGS and GC-SEPM Meeting, Houston, Texas, October 16-18, 1991 (2009)