The primary project goal is to gain insight into the nature, formation, occurrence, and physical properties of methane hydrate-bearing sediments for methane hydrate resource appraisal through the planning and execution of drilling, coring, logging, testing, and analytical activities to assess the geologic occurrence, regional context, and characteristics of marine methane hydrate deposits in the Gulf of Mexico (GOM) and/or other areas of the United States (U.S.) Outer Continental Shelf.
University of Texas at Austin (UTA), Austin, TX
Ohio State University, Columbus, OH
Columbia University, Lamont Doherty Earth Observatory, Palisades, NY
Oregon State University, Corvallis, OR
University of New Hampshire, Durham, NH
University of Washington, Seattle, WA
United States Geological Survey (USGS), Denver, CO
Methane hydrates within sand‐rich marine reservoirs represent a vast reservoir of methane. Previous drilling in the GOM has verified the presence of hydrate-filled sand reservoirs and shown that such reservoirs can be identified by seismic analysis. However, conventional and pressurized cores of these reservoirs have not been collected, a number critical in situ measurements are lacking, and pressure perturbation experiments have not been performed.
The project team will attempt to address these issues by planning and executing a state-of-the-art deepwater, methane hydrate drilling program targeting methane hydrate reservoirs on the U.S. continental margin.
In Phase 1, potential research expedition sites will be identified, appraised using available geophysical and geologic data, and ranked using criteria developed in conjunction with the U.S. Department of Energy (DOE). Following site selection, pre-expedition drilling, coring, and logging and a sampling operational plan will be developed and efforts undertaken to access a suitable drill ship/science vessel. A Complementary Project Proposal (CPP), based on the Operational Plan, will be submitted to the International Ocean Discovery Program (IODP) as a primary method of accessing a suitable drill ship/science vessel. Lab testing, modification, and planning for a land-based field test of the pressure coring tool with ball valve (PCTB) will be conducted concurrently.
During Phase 2, a land-based field test of the PCTB will be conducted followed by a Marine Field Test (UT-GOM2-1) in a deep‐water environment. UTA will develop the capability to transport, store, and manipulate pressure cores, acquired during the UT-GOM2-1 and will transport the cores to land-based facilities, to be stored, subsampled, and characterized. The Operational Plan for the UT-GOM2-2 Scientific Drilling Program will be refined. UTA will provide notification of CPP outcome and, if necessary, evaluate alternate means of gaining access to a vessel for the UT-GOM2-2 Scientific Drilling Program.
During Phase 3, UTA will continue support of the CPP and will maintain and further develop the capability to transport, store, and manipulate pressure cores. Pressure cores acquired during UT-GOM2-1 will be further characterized and pressure core analytical capabilities will be strengthened. The Operational Plan for the UT-GOM2-2 Scientific Drilling Program will be refined, and UTA will continue to pursue access to a vessel for the UT-GOM2-2 Scientific Drilling Program. A post UT-GOM2-1 performance evaluation of the PCTB will take place concurrently, a second PCTB lab test will be performed, and modifications will be made as required. Additionally, UT-GOM2-2 Scientific Drilling Program preparations will be initiated.
In Phase 4, Pressure cores acquired during UT-GOM2-1 will be further characterized and pressure core analytical capabilities will be strengthened. The Operational Plan for UT-GOM2-2 will be refined and UTA pursuit of access to a vessel for UT-GOM2-2 will be continued. Engineering modifications to the PCTB will continue to be made as needed, and a Land Test of the PCTB will be conducted prior to planned deployment during the UT-GOM2-2 (Phase 5). UT-GOM2-2 preparations will continue, including planning and initiation of permitting.
During Phase 5, pressure cores acquired from the UT-GOM2-1 will complete characterization. The Operational Plan for UT-GOM2-2 will be finalized and UTA will complete contracting for a suitable vessel and preparations and permitting for the expedition. UT-GOM2-2 Program will be executed, and will involve drilling, logging and collecting core samples in marine gas hydrate bearing sediments in the GOM. Planned data and sample acquisition includes, but is not limited to: pressure cores, conventional wireline cores, and probe penetrometer measurements to determine the in situ thermodynamic conditions. Following shipboard operations, UTA transport the cores to land-based facilities to be stored, subsampled, and characterization initiated.
In Phase 6, pressure cores acquired from UT-GOM2-2 will continue to be characterized and UTA will distribute hydrate cores to other research facilities. Scientific analysis of methane hydrate reservoirs will continue through sample and data distribution, collaborative analysis of geologic data, archiving or the scientific results volume, and technical presentations. A summary of the onboard drilling and sample procurement procedures as well as scientific results will be archived and will be made publicly available..
Successful acquisition of project data will strengthen our understanding of methane hydrate morphology, saturation, physical properties, geochemistry, and geological characteristics. These data will provide the foundation to model and ultimately predict the behavior of these reservoirs during perturbations caused by production. More broadly, the field data will strengthen our ability to reliably predict concentrations of methane hydrate and formation stability in sand‐dominated reservoir settings as well as better understand the contribution of marine methane hydrates to the carbon cycle.
Methane hydrates may ultimately contribute to the long‐term energy security of the U.S. and world. Characterization of methane hydrates in marine sands is the first step toward demonstrating the feasibility of production from this type of hydrate occurrence.
Budget Period (BP) 3
The project formally transitioned to Phase 4 in October 2019. As a part of the transition from Phase 3 into Phase 4, some meaningful changes were made in the project to accommodate the need to shift from a prior plan for the project’s large scale research expedition (UT-GOM2-2) in collaboration with — and using a drilling vessel operated by — the IODP to an approach in which activities would be conducted using a commercial drilling vessel directly contracted by UTA in early 2018. Key changes included an extension of planned project period through 2024 to accommodate UT-GOM2-2 in 2022 as well as a shift to a more targeted expedition focused on a single location (multiple wells) in the Terrebonne basin (WR313) and a shift to a plan for an initial dockside analysis of core from the expedition versus the prior plan of doing this at sea.
Activity in Phase 4 will focus on preparations for UT-GOM2-2, including initialization of contracting and permitting for the expedition and refining of scientific, operational, and logistical plans. In addition, Phase 4 will involve modifications to the PCTB pressure coring system (based on results of lab testing in Phase 3) and a land-based field test of the system prior to planned deployment during UT-GOM2-2 in Phase 5. Concurrently during Phase 4, project researchers will continue analyzing cores collected during UT-GOM2-1 and will strengthen capabilities for analysis in preparation for cores expected in Phase 5.
Planned Total Funding (through all project phases): $98,993,151
Marine Test Expedition Report – Expedition Summary [PDF] February, 2018
ICGH 2017 Paper on Marine Test Drilling, Logging and Coring Expedition [PDF-1MB] May 2017