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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
Environment of Deposition and Reservoir Morphology of Lower Pennsylvanian Sandstones, South Empire Field, Eddy County, New Mexico
Abstract
Lower Pennsylvanian Morrowan sandstones produce gas from tight channel sands 10,000 to 12,000 feet (3048 to 3658 m) deep in southeast New Mexico. In the Lower Morrow, very coarse-grained quartzose sandstones were deposited as stacked, dip-trending channel sands, thicknesses exceeding 120 feet (37 m) in the northern part of the field. Sandstone deposition is more widespread in the Middle Morrow, with greatest accumulations to the south in a basinward direction. Here, deposition of finer-grained sandstones exceeds 100 feet (31 m). The thin-bedded, stacked channel sequences are the result of rapid lateral migration of streamflow across the delta plain. Production from both the Lower and Middle Morrow is dependent on the development of secondary porosity and permeability, which results from the alteration and dissolution of detrital feldspars, rock fragments, and secondary cements. Secondary porosity development is greatest in thick, stacked channel sands where porosities to 20 percent, and permeabilities to 715 md are present in otherwise tightly cemented sandstones.
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