STRATIGRAPHIC ARCHITECTURE OF THE TONGANOXIE PALEOVALLEY FILL (LOWER VIRGILIAN) IN NORTHEASTERN KANSAS

Lower Pennsylvanian paleovalley-confined sandstones are important petr oleum reservoirs in the Midwest. In Kansas, such reservoirs have produ ced approximately 220 million bbl of oil and 1.7 tcf of gas. Valley-fi ll successions tend to become muddy upward, but there can be considera ble local heterogeneity in which reservoir sandstones pass laterally i nto muddy sandstones or nonreservoir shales. The lack of understanding of this reservoir heterogeneity can lead to low drilling success rate s. The Tonganoxie paleovalley (Upper Pennsylvanian, northeastern Kansa s) contains facies very similar to Lower Pennsylvanian (Morrowan) vall ey fills, and can provide an outcrop- and subsurface-based model of sa ndstone deposition. The Tonganoxie paleovalley was incised during lowe red sea level and filled during the subsequent transgression. The main paleovalley is approximately 41 m deep, 11 km wide, and 240 km long, and was fed by l-km-wide tributary valleys oriented roughly normal to the trunk valley. Sandstones occur in four distinct architectural elem ents that were deposited during different phases of transgression. Typ e I sandstone consists of a belt of sandstone and conglomerate 3-18 m thick and confined to the trunk valley and wider portions of tributary valleys. Type I sandstone consists of amalgamated channel fills, has little or no mud, and has the highest porosity and permeability. The t ype I sandstone is overlain by estuarine deposits of sandstone (type I I sandstones), rippled argillaceous sandstone to sandy mudstone, and c oal. Most of the paleovalley was filled during this stage. The type II sandstones are narrow (1.5 km wide) arcuate bodies up to 8 km long an d were likely deposited in tidal point bars near the fluvial to tidal transition, are either isolated sandstone bodies or are incised into t ype I sandstone. The higher mud content is expected to reduce porosity and permeability compared to fluvial facies. Type III sandstone bodie s occur at: the upstream limits of narrow tributaries and are probably bay-head deltas. Well logs indicate a range of mud content. Type TV s andstone is a thin (3 m) discontinuous sheet of marine sandstone depos ited after most of the paleovalley had been filled.