Midcontinent Geoscience https://journals.ku.edu/mg <p><em>Midcontinent Geoscience</em>&nbsp;is an open-access, peer-reviewed publication of the Kansas Geological Survey, a research and service division of the University of Kansas. The journal publishes a broad array of original research covering all branches of geology with an emphasis on the midcontinent region of the United States, including the Great Plains and Central Lowland provinces.</p> <p>&nbsp;</p> en-US <p>Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a&nbsp;<a href="https://creativecommons.org/licenses/by-nc/4.0/">Creative Commons Attribution Non-Commercial License</a>&nbsp;that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal. 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The Corresponding Author also warrants that he or she has the full power to make this agreement, and if the Work was prepared jointly, the Corresponding Author agrees to inform the Authors of the terms of this Agreement and to obtain their written permission to sign on their behalf. The Corresponding Author agrees to hold the Journal harmless from any breach of the aforestated representations.&nbsp;<br> <br> D.&nbsp; JOURNAL’S DUTIES&nbsp;<br> In consideration of the Author’s grant of rights, the Journal agrees to publish the Work, attributing the Work to the Authors.&nbsp;<br> <br> E. ENTIRE AGREEMENT&nbsp;<br> This agreement reflects the entire understanding of the parties. This agreement may be amended only in writing by an addendum signed by the parties. Amendments are incorporated by reference to this agreement.&nbsp;<br> ACCEPTED AND AGREED BY THE CORRESPONDING AUTHOR ON BEHALF OF ALL AUTHORS CONTRIBUTING TO THIS WORK</p> alayzell@kgs.ku.edu (Tony Layzell) mreed@ku.edu (Marianne Reed) Thu, 13 May 2021 00:00:00 -0500 OJS 3.3.0.6 http://blogs.law.harvard.edu/tech/rss 60 Wrench faulting and trap breaching: A case study of the Kizler North Field, Lyon County, Kansas, USA https://journals.ku.edu/mg/article/view/14892 <p class="p1">The Kizler North Field in northwest Lyon County, Kansas, is a producing field with structures associated with both uplift of the Ancestral Rockies (Pennsylvanian to early Permian) and reactivation of structures along the Proterozoic midcontinent rift system (MRS), which contributed to the current complex and poorly understood play mechanisms. The Lower Paleozoic dolomitic Simpson Group, Viola Limestone, and “Hunton Group” are the reservoir units within the field. These units have significant vuggy porosity, which is excellent for field potential; however, in places, the reservoir is inhibited by high water saturation. The seismic data show that two late-stage wrench fault events reactivated existing faults. The observed wrench faults exhibit secondary P, R’, and R Riedel shears, which likely resulted from Central Kansas uplift-MRS wrenching. The latest stage event breached reservoir caprock units during post-Mississippian to pre-Desmoinesian time and allowed for hydrocarbon migration out of the reservoirs. Future exploration models of the Kizler North and analog fields should be based on four play concepts: 1) four-way closure with wrench-fault-related traps, 2) structural highs in the Simpson Group and Viola Limestone, 3) thick “Hunton Group,” and 4) presence of a wrench fault adjacent to the well location that generates subtle closure but not directly beneath it, which causes migration out of reservoirs. In settings where complex structural styles are overprinted, particular attention should be paid to the timing of events that may cause breaches of seals in some structures but not others. Mapping the precise location and vertical throw of the reactivated wrench faults using high-resolution seismic data can help reduce the drilling risk in analog systems.</p> Md Nahidul Hasan, Sally Potter-McIntyre, Steve Tedesco Copyright (c) 2021 Md Nahidul Hasan, Sally Potter-McIntyre, Steve Tedesco https://journals.ku.edu/mg/article/view/14892 Thu, 13 May 2021 00:00:00 -0500