BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CiviCRM//NONSGML CiviEvent iCal//EN X-WR-TIMEZONE:America/Chicago METHOD:PUBLISH BEGIN:VEVENT UID:CiviCRM_EventID_2682_d3319be4f90071e87b81b1178ed41494@www.hgs.org SUMMARY:HGS April General Lunch DESCRIPTION:WAG&rsquo\;ing the dog: Engineered signals to cali brate 4D expectations at Liza\, Offshore Guyana\n \n by Kirk Wagenvelt\n \n Date: Wednesday 22 April \n \n Time: 11:30 am &ndash\; 1 pm\n \n Location: Woodside Energy\, 1500 Post Oak Blvd\, Houston\, T X 77056\n \n Directions: Park in visitor parking a nd take a ticket\; parking will be validated\n \n Cost: $30 Members\, $35 Non-members\, $25 Students \n \n  \;\n \n Abstract: \;\n \n The 2022- 23 Stabroek OBN campaign included surveys over fiv e development areas in offshore Guyana between Oct ober 2022 and November 2023\, beginning and ending with surveys at the Liza field. The first survey denoted Liza node zero (N0) is intended as a seafl oor 4D baseline\, although at Liza\, the only pre- production seismic data is from streamer surveys p rior to the 2019 field startup. The second survey\ , Liza N1\, provided our first look at seafloor 4D data in Guyana. Key objectives of N1 were focused on understanding the types and strengths of 4D si gnal available for interpretation and reservoir ma nagement&mdash\;not only for Liza\, but also for i nforming monitoring plans for the four other curre nt Stabroek development areas. Understanding the d etectability of 4D signals related to changes in p ressure and fluid\, especially water alternating g as (WAG) was an objective to inform monitoring fre quency and data quality needs going forward. Model ing predicted moderate signals from both water and gas sweep. However\, the detectability resulting from a combination of water plus gas sweep (or vic e versa) was not yet established\, and the extent to which injected gas would enter a miscible phase \, versus a more readily detectable free phase was uncertain. Reservoir pressure maintenance is also part of the injection strategy ensuring pressure maintenance. Modeling showed weaker 4D signal from changes in reservoir pressure given Liza rock phy sics and reservoir simulation results. Under norma l field operating conditions\, and given the surve y timings\, the results of the 4D difference would continue to leave these questions unanswered. To increase the value of our early monitor\, our subs urface geoscience and engineering teams coordinate d with field operations and our geophysical operat ions team to deliberately induce WAG and pressure signals between N0 and N1. Two examples are shown here\, where we timed WAG fluid switches\, and an injection pressure increase specifically to appear on our 4D seismic monitor. By performing these te sts relatively early in the life of Stabroek field s\, we have begun quantitatively calibrating our 4 D modeling and have informed the interpretability of these signals. We believe that having this info rmation will better inform our 4D seismic monitori ng decisions for years to come. A WAG injection sw itch at well 4i helped confirm modeling expected 4 D signals with field observations (Figure 1). A pr essure increase at another injector i8 was perform ed to understand reservoir compartmentalization in a particular reservoir segment. A pressure increa se of ~1000 psi was achieved at the well during N1 and illuminated compartment boundaries.\n \n &nbs p\;\n \n Kirk A. Wagenvelt - \;Geoscientist\, ExxonMobil\n \n \n \n Kirk A. Wagenvelt is a Geosc ientist at ExxonMobil with more than 15 years of e xperience spanning oil and gas exploration\, produ ction\, development\, and environmental remediatio n. He holds a B.S. in Geochemistry and an M.S. in Geology from Western Michigan University. Since jo ining ExxonMobil in 2015\, Kirk has worked across numerous basins worldwide\, with a strong focus on South America. Over the past five years\, he has been a leading voice in advancing 4D seismic integ ration for opportunity generation and reservoir ma nagement in the Liza and Payara developments offsh ore Guyana. His work has significantly contributed to improving subsurface understanding and optimiz ing field performance by pushing the limits of pro active 4D seismic applications. In his current rol e as an Advisor on the Guyana Blockwide Value Team \, Kirk delivers subsurface solutions across the S tabroek Block\, helping shape current and future d evelopments with a focus on maximizing recovery th rough 4D seismic interpretation and production dat a integration workflows. Kirk has been recognized both within ExxonMobil and by the broader geoscien ce community for his technical leadership and inno vation. His notable contributions include the talk &ldquo\;WAG&rsquo\;ing the Dog: Engineered signal s to calibrate 4D expectations at Liza\, Offshore Guyana\,&rdquo\; presented at the SEG 4D Forum and IMAGE. CATEGORIES:General Lunch CALSCALE:GREGORIAN DTSTAMP;VALUE=DATE-TIME:20260422T113000 DTSTART;VALUE=DATE-TIME:20260422T113000 DTEND;VALUE=DATE-TIME:20260422T130000 LOCATION:Woodside Energy\n 1500 Post Oak Blvd\n Houston\, T X 77056\n United States\n URL:https://www.hgs.org/civicrm/event/info?reset=1&id=2682 END:VEVENT END:VCALENDAR