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Petrophysical and geophysical interpretation of a potential gas hydrate reservoir at Alaminos Canyon 810, northern Gulf of Mexico

Yang, Chen
http://rave.ohiolink.edu/etdc/view?acc_num=osu1480596190825913

Abstract Details

2016, Master of Science, Ohio State University, Earth Sciences.
We characterize the gas hydrate reservoir in Alaminos Canyon Block 810 (AC810) on the northern Gulf of Mexico slope. Three-dimensional seismic data shows a bottom-simulating-reflection (BSR), over 30 km2, which suggests that a significant gas hydrate accumulation may occur at AC810. Furthermore, logging while drilling (LWD) data acquired from a Statoil well located that penetrated the BSR near the crest of the regional anticline indicates two possible gas hydrate units (Hydrate Unit A and Hydrate Unit B). LWD data in this interval are limited to gamma ray and resistivity only. Resistivity curve separations are observed in Hydrate Unit A (135 to 290 mbsf) suggesting hydrate-filled fractures in marine mud. A high resistivity response in Hydrate Unit B (290 to 357 mbsf) could either be a marine mud or a sand-prone interval. The abrupt decrease (from 7 to 1 ¿m) in resistivity logs at 357 mbsf generally corresponds with the interpreted base of hydrate stability, as the BSR is observed near 350 mbsf on the seismic data. The formation type of hydrate reservoirs relates to hydrate volume estimation, which plays an important role in economic gas productivity and released methane volume to atmosphere. To further investigate the formation characteristics, we generate synthetic traces using general velocity and density trends for marine sediments to match the seismic trace extracted at the Statoil well. We consider models with 1) marine mud model and 2) marine sand model. Marine mud models suggest that gas hydrate is present in a marine mud. The marine sand model indicates that Hydrate Unit B is sand with high hydrate saturation; however, to achieve a suitable match between the water-below synthetic seismogram and the seismic trace, a high velocity layer was required below the base of hydrate stability, which is not indicated by the well logs. Our models indicate that at AC810, Hydrate Unit A probably contains hydrate filled fractures in a marine mud. For Hydrate Unit B, our models suggest hydrate may occur in a sand-prone interval, but is more likely to be gas hydrate filled fractures in marine mud.
Ann Cook (Advisor)
Derek Sawyer (Advisor)
Audrey Sawyer (Committee Member)
52 p.
Geology; Geophysics
Gas hydrate, Gulf of Mexico, Geophysical exploration, Petrophysical model

Recommended Citations

Citations

  • Yang, C. (2016). Petrophysical and geophysical interpretation of a potential gas hydrate reservoir at Alaminos Canyon 810, northern Gulf of Mexico [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1480596190825913

    APA Style (7th edition)

  • Yang, Chen. Petrophysical and geophysical interpretation of a potential gas hydrate reservoir at Alaminos Canyon 810, northern Gulf of Mexico . 2016. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1480596190825913.

    MLA Style (8th edition)

  • Yang, Chen. "Petrophysical and geophysical interpretation of a potential gas hydrate reservoir at Alaminos Canyon 810, northern Gulf of Mexico ." Master's thesis, Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1480596190825913

    Chicago Manual of Style (17th edition)

osu1480596190825913
176
© 2016, some rights reserved.Creative Commons License Petrophysical and geophysical interpretation of a potential gas hydrate reservoir at Alaminos Canyon 810, northern Gulf of Mexico by Chen Yang is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by The Ohio State University and OhioLINK.