Aledo Southeast 1,200-Ft Strawn Gas Field and Associated Deeper Production, Southeast Parker and Southwest Tarrant Counties, Texas: ABSTRACT

Abstract

Most of the gas production in this region comes from earlier shallow zones ( The Aledo Southeast 1,200-ft Strawn field is one of the most profitable gas fields in the area. The marked linearity of this field demonstrates that the productive sand body is of fluvial origin. Its general east-west orientation indicates a fluvial system that flowed westward from the Ouachita highlands, and its flared shape on the western end suggests shoreline redistribution of the sands. Study of core and cuttings clearly reveals fluvial features, such as mud clasts, ripple laminations, wood fragments, and slump structures. Detailed mineralogic analyses by x-ray diffraction and scanning electron microscopy indicate the shallow and deep reservoirs are feldspathic sandstones that are variously limy or dolomitic and contain major amounts of kaolinite and lesser amounts of illite, chlorite, and mixed layer clays. Isopach maps combined with structure contour maps show the field is a trap formed where an east-west channel sand is tilted downward on the north side intercepting a gas-water contact. The south (updip) margin is a sand pinch-out. A marked sag, caused by differential subsidence, intercepts the gas-water contact and interrupts continuous production along the channel beneath the Parker-Tarrant county line. End_of_Article - Last_Page 143------------