Influence of structure on Mississippian paleotopography and distribution of Middle Pennsylvanian sandstone reservoirs on the Cherokee platform, northern Oklahoma

查看详情 浏览次数:1
中文题名俄克拉荷马州北部切罗基地台上构造对密西西比古地形和宾夕法尼亚中期砂岩储层分布的影响
作者Kevin J. Toth; James O. Puckette
作者单位Boone Pickens School of Geology, Oklahoma State University, Stillwater, Oklahoma
刊名AAPG BULLETIN
2021
12
摘要
Valley filling sandstone of the Red Fork and lower Skinner sequences in parts of Noble, Pawnee, and Osage Counties, Oklahoma, exhibits linear distribution patterns that differ from regional sediment dispersal systems and result in the stacking of reservoirs. Middle Pennsylvanian (Desmoinesian) Cherokee Group sandstones are dominantly channel filling and have produced large volumes of oil and gas since their discovery in the early twentieth century. The sandstone-bearing channels at the focus of this study are highly elongated and narrow (≥10 mi long and ≤1 mi wide [≥16 km long and ≤1.6 km wide]), contain thick accumulations of sandstone (50–200 ft [15–60 m] thick), and are unexpectedly stacked. These observations prompted the hypothesis that accommodation was generated along the same trend across two fourth-order high-frequency cycles for a cumulative time span ranging from 0.4 to 1.0 m.y. The distribution of these narrow, channel-filling, “shoestring” sandstones can be difficult to map using wire-line log control. Furthermore, if the orientation of these channels was influenced by faulting, these faults are not recognized in structure and thickness maps constructed from wire-line log data. A three-dimensional seismic volume covering part of the study area provided data necessary to delineate faults that influenced paleotopography and drainage patterns during Cherokee deposition. It is proposed that erosion favored the fault-influenced topographic lows, generating valleys that subsequently filled during transgression. By detecting the causative fault at the contact between the Mississippian carbonate section and overlying Pennsylvanian siliciclastics, seismic data provide an additional exploration tool to locate lucrative but elusive Pennsylvanian shoestring sandstone reservoirs.

@ 2023 版权所有 中国地质图书馆 (中国地质调查局地学文献中心)

京ICP备 05064591号 京公网安备11010802017129号

建议浏览器: 火狐、谷歌、微软 Edge、不支持 IE