Controlled-source marine electromagnetic 2-D modeling gas hydrate studies     

T. Harinarayana  Bob Hardage  Arnold Orange 《Marine Geophysical Researches》2012,33(3):239-250

Research on gas hydrate has increased recently as an alternative to fossil fuel. This study of marine controlled source electromagnetics (CSEM) is motivated by this increase, particularly in deep waters, and examines representative models. We present 2D models and test their efficacy in detection and characterization of gas hydrates. Earlier modeling studies used a horizontal transmitter to study the CSEM response??two electrical and one magnetic component??for resistive subsurface layers. Here we use six components??three electrical and three magnetic??and show that the proposed method reduces ambiguity in interpretation. Additionally, we show results utilizing the transmitter dipole in a borehole and receivers at the sea bottom. We found that CSEM response from a vertical transmitter helps us characterize resistive layers more confidently than from a transmitter moving horizontally at sea bottom. We conclude that in a complex environment, combining horizontal and vertical movements of the transmitter with sea-bottom receivers helps us delineate the subsurface structure more clearly and may help reduce drilling costs. Our models closely match the gas hydrate region in the Gulf of Mexico??Walker Ridge Block-313. Although this study examines gas hydrate, the methodology is applicable to other areas??for example, in monitoring gas diffusion at subsurface depths, which may help in CO₂ sequestration.  相似文献   

Late Holocene environmental change in Celestun Lagoon,Yucatan, Mexico     

Hardage  Kyle  Street  Joseph  Herrera-Silveira  Jorge A.  Oberle  Ferdinand K. J.  Paytan  Adina 《Journal of Paleolimnology》2022,67(2):131-162

Journal of Paleolimnology - Epikarst estuary response to hydroclimate change remains poorly understood, despite the well-studied link between climate and karst groundwater aquifers. The influence...  相似文献   

Fracture characterization using converted waves          下载免费PDF全文

Mehdi E. Far  Bob Hardage 《Geophysical Prospecting》2016,64(2):287-298

We present a method for inversion of fracture compliance matrix components from wide‐azimuth noisy synthetic PS reflection data and quantitatively show that reflection amplitude variations with offset and azimuth for converted PS‐waves are more informative than P‐waves for fracture characterization. We consider monoclinic symmetry for fractured reservoir (parameters chosen from Woodford Shale), which can be formed by two or more sets of vertical fractures embedded in a vertically transverse isotropic background. Components of effective fracture compliance matrices for a medium with monoclinic symmetry are related to the characteristics of the fractured medium. Monte Carlo simulation results show that inversion of PS reflection data is more robust than that of PP reflection data to uncertainties in our a priori knowledge (vertically transverse isotropic parameters of unfractured rock) than PP reflection data. We also show that, while inversion of PP reflections is sensitive to contrasts in elastic properties of upper and lower media, inversion of PS reflections is robust with respect to such contrasts.  相似文献   

Assessing Metal Content in Halophila stipulacea Seagrass as an Indicator of Metal Pollution in the Northern Gulf of Aqaba,Red Sea     

Al-Najjar  Tariq  Wahsha  Mohammad  Al-Khushman  Mwaffaq  Khalaf  Maroof  Hardage  Kyle  Hayek  Wissam  Khadra  Khalid Abu  Paytan  Adina 《Ocean Science Journal》2021,56(4):364-377

Ocean Science Journal - To assess the utility of the seagrass (Halophila stipulacea) for biomonitoring of metal pollution, seagrass samples were collected from four sites along the Jordanian coast...  相似文献