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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: The South Lake Arthur Field and
the Occurrence of Buried Structures
Along the Oligocene Trend of
Southwestern Louisiana
By
Significant gas reserves have recently been discovered In the Miogypsinoides sands along the Oligocene trend at the South Lake Arthur field. Detailed subsurface maps and seismic data are presented to exhibit the extent and nature of this local structure and to demonstrate future opportunities along the Oligocene trend.
Since discovery in 1980, the South Lake Arthur field
has been extended three miles northeast and has encountered
over 20 net feet of Miogypsinoides pay. Estimated
reserves are in order of 1500 BCFG with limits of the field
still unknown. Cross
sections across the field depict the trap
as a buried anticline with a gas column approaching 1000
feet.
Interpretation of the origin of this local structure is that of diapiric shale with a probable salt core. Detailed sub surface maps at the Miogypsinoides level and the overlying Camerina level are presented. These maps indicate that the deeper Miogypsinoides is a simple faulted anticline while the overlying Camerina is highly faulted. The apex of the overlying Camerina structure is juxtaposed by almost two miles relative to the deeper Miogypsinoides structure.
Analysis indicates that important structural growth
occurred after Miogypsinoides deposition with a local
unconformity covering the apex of the structure. Deposition
of the overlying Camerina section
was rapid, with faulting
dying with depth in the underlying shale. State-of-the-art
reconnaissance seismic data clearly exhibit this prolific
buried structure. Occurrences of similar juxtaposed buried
structures are predicted along the Oligocene trend offering
explorationists many new opportunities.
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