Article
Energy & Fuels
Jung-Tae Kim, Chul-Whan Kang, Ah-Ram Kim, Joo Yong Lee, Gye-Chun Cho
Summary: The study investigated the impact of permeability on gas productivity and stability of hydrate-bearing sediments, establishing an empirical permeability model from experimental data and comparing the application of different models in numerical analysis. The findings highlighted significant differences in productivity and stability analysis results based on the proposed permeability model, emphasizing the importance of using a regional permeability model for accurate numerical analysis.
Article
Engineering, Ocean
Gil Young Kim, Buyanbat Narantsetseg, Dong Geun Yoo
Summary: Gas hydrate has been found in the Ulleung Basin off the east coast of the Korean Peninsula, mainly concentrated in resistive fractures at seismic chimney sites. The fracture orientations and dips reveal the regional stress regime, with the maximum horizontal stress being NW?SE.
MARINE GEORESOURCES & GEOTECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Taehun Lee, Joo Yong Lee, Taewoong Ahn, Han Am Son
Summary: The cyclic depressurization method can significantly enhance geomechanical stability and increase gas production. It was found that by utilizing different bottomhole pressure and production time during depressurization, cumulative gas production can be greatly improved, while maintaining or even increasing stability in the subsurface.
APPLIED SCIENCES-BASEL
(2021)
Article
Geosciences, Multidisciplinary
Junbong Jang, William F. Waite, Laura A. Stern, Joo Yong Lee
Summary: Expeditions in the Ulleung Basin Gas Hydrate field have discovered evidence of gas hydrate, primarily as fracture-filling morphologies in fine-grained sediment. The presence of diatoms in the sediment influences its mechanical properties, but only at high diatom concentrations does it increase porosity and permeability.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Engineering, Marine
Sang Lyeol Kim, Su Min Kang, Hyung Gon Lee, Gwan Hee Han, Ok Hwan Yu
Summary: This study conducted a survey of macrobenthos species diversity and community structure in the Ulleung Basin of the East Sea in South Korea. A total of 262 species were detected, with an average density of 243 individuals/m(2) and an average biomass of 43.7 g/m(2). The community structure was influenced by water depth, temperature, salinity, and dissolved oxygen. The findings have important implications for understanding benthic ecosystems in the East Sea.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Hyo-Ryeon Kim, Jae-Hyun Lim, Ju-Hyoung Kim, Satheeswaran Thangaraj, Il-Nam Kim
Summary: This study used a metagenomic approach to investigate the influences of water mass mixing and eddy circulation on surface bacterial communities in the Ulleung Basin of the East Sea, and found significant effects on the composition of bacterial communities, which were strongly correlated with specific seasonal physicochemical parameters.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Marine
Jae Seong Lee, Sung-Han Kim, Ju-Wook Baek, Kyung-Tae Kim, Dongseon Kim, Young-il Kim, Won-Chan Lee, Sung-Uk An, Chang Hwan Kim, Chan Hong Park, Sokjin Hong
Summary: The study characterized the biogeochemical organic carbon cycles in the surface sediment layer of the Ulleung Basin in the East Sea, showing that benthic biological activity plays a key role in controlling benthic remineralization. The organic carbon oxidation rates accounted for approximately 2% of the primary production, with a significant portion of deposited organic carbon buried into the inactive sediment deep layer, highlighting the importance of organic carbon burial fluxes in this marine environment.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Bo-Yeon Yi, Young-Ho Yoon, Young-Jun Kim, Gil-Young Kim, Yong-Hwan Joo, Nyeon-Keon Kang, Jung-Ki Kim, Jong-Hwa Chun, Dong-Geun Yoo
Summary: This study presents a new method for tracking thin layers using stepwise seismic inversion and 3D seismic datasets with two different resolutions. The high-resolution acoustic impedance volume obtained is used to trace thin layers that cannot be tracked using conventional methods. Additionally, the study estimates high-resolution regional GH distribution and characterizes thin GH layers based on lateral variation.
Article
Geosciences, Multidisciplinary
Jiangong Wei, Tingting Wu, Linqi Zhu, Yunxin Fang, Jinqiang Liang, Hailong Lu, Wenjiu Cai, Zhiyuan Xie, Peixin Lai, Jun Cao, Tianbang Yang
Summary: The analysis of gas hydrate samples from the Qiongdongnan basin of the South China Sea revealed that methane is the main component of the hydrate-bound gas, along with other hydrocarbon gases, suggesting a mixture of microbial and thermogenic gases. Raman spectroscopy showed a co-existence of structure I and structure II gas hydrates in the samples, indicating that natural gas hydrate resources might be underestimated.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Energy & Fuels
Hyun Chul Yoon, Jihoon Kim, Evan Schankee Um, Joo Yong Lee
Summary: This study investigates the feasibility of using electromagnetic geophysics methods to detect gas hydrate dissociation in the Ulleung Basin, East Sea, Korea. Flow and geomechanics simulations were performed and the electrical conductivity model for electromagnetic simulation was established based on the obtained saturation and porosity fields. Two different approaches in the electromagnetic configuration were compared, and it was found that the surface-to-borehole method showed improved sensitivity in monitoring gas flow. This integrated simulation can be a potential tool for monitoring gas hydrate deposits.
Article
Environmental Sciences
Hyuntae Choi, Jeomshik Hwang, Yeongjin Ryu, Guebuem Kim, Kyung-Hoon Shin
Summary: The nitrogen isotope ratios of amino acids in sinking particles reflect the seasonal dynamics of nitrogen sources and trophic structure in the water column. Sinking particles at 2250 m contain more resuspended sediment and undergo more microbial degradation compared to samples at 1000 m.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Oceanography
Won Gi Min, Hyun Soo Rho, Yong Il Kim, Dongsung Kim, Joo Myun Park
Summary: Understanding the bathymetric patterns of deep-sea meiofauna is essential for understanding the impact of environmental factors on the characteristics of meiofaunal community structures. This study investigated the depth-dependent meiobenthic community structures in the Ulleung Basin in the southeastern East Sea. The results showed significant spatial trends in the distribution of meiobenthic animals, with higher densities on the southern slope of the Ulleung Basin compared to the shelf or deep basin regions. Total organic carbon concentration was found to be significantly correlated with meiobenthic abundance, indicating the importance of food supply in promoting meiofaunal abundance. The study also revealed depth-related trends in meiobenthic community structures, with various taxa contributing to the variations in meiofauna.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2023)
Article
Environmental Sciences
Jung-Ho Hyun, Bomina Kim, Heejun Han, Yong-Jae Baek, Hyeonji Lee, Hyeyoun Cho, Seok-Hyun Yoon, Guebuem Kim
Summary: The release of bio-reactive dissolved organic matter from the benthic zone may play an important role in microbial processes in the deep-water layer of marginal seas.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Minsoo Ji, Seoyoon Kwon, Min Kim, Sungil Kim, Baehyun Min
Summary: This study proposes a deep-learning-based model for generating synthetic compressional wave velocity (Vp) from well-logging data, and applies it to the study of gas hydrates in the Ulleung Basin in the East Sea, Republic of Korea. By detecting the morphology of the hydrate and identifying the bottom-simulating reflector (BSR), the model can accurately estimate missing well-logging data, contributing to the reservoir characterization of gas-hydrate-bearing sediments.
APPLIED SCIENCES-BASEL
(2022)
Article
Energy & Fuels
Sun Young Park, Byeong-Kook Son, Jiyoung Choi, Hongkeun Jin, Kyungbook Lee
Summary: This study developed a machine learning model that can efficiently probe the mineral composition from X-ray diffraction patterns of GH sediments. Various machine learning algorithms were employed, and the random forest approach yielded the best prediction result. This method allows experts to analyze mineral compositions efficiently and reliably.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Weijiao Ma, Jinbu Li, Min Wang
Summary: The petroleum resource assessment obtained from laboratory tests on old core samples tends to underestimate the in situ resources. This study investigates the hydrocarbon loss and restoration by comparing preserved and exposed core samples. It is found that previous studies have severely underestimated the in situ hydrocarbon potential due to factors such as sample crushing and crucible waiting. A new restoration model is proposed to compensate for these losses.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Shaoyun Chen, Yongqiang Yang, Longwei Qiu, Xiaojuan Wang, Erejep Habilaxim
Summary: Quartz cement is an important authigenic mineral in the tight sandstones of the Shaximiao Formation in the Sichuan Basin. This study analyzed the silicon sources of the quartz cement using mineralogical, fluid inclusion, and geochemical data. The results showed that smectite alteration and dissolution of aluminosilicate minerals were the primary sources of silicon for quartz cementation. Contributions from volcanic material hydrolysis and pressure solution were relatively minor. The presence of chlorite films inhibited the development of quartz overgrowths and had minimal impact on reservoir quality.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Xing Jian, Ping Guan, Ling Fu, Wei Zhang, Xiaotian Shen, Hanjing Fu, Ling Wang
Summary: This study presents a synthesis of new detrital zircon dating results and published data from the Cenozoic Qaidam basin, revealing the spatiotemporal variation of detrital zircon age populations and supporting models of synchronous deformation in northern Tibet. The study emphasizes the importance of considering textural and sedimentological parameters in zircon provenance interpretations, as well as the need for integrated provenance analysis involving other detritus components.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
A. Peketi, G. Sriram, A. Mazumdar, P. Dewangan, A. Zatale, V. Rajurkar, Gayatri Shirodkar, V. Mahale, V. Yatheesh
Summary: This study investigates 13 submarine seamounts in the southern Andaman volcanic arc and observes evidence of hydrothermal activity in one of the seamounts. The evidence includes plumes rich in dissolved gases, live chemosymbiotic organisms, and the deposition of neoforming minerals. These observations suggest the development of a new hydrothermal field in the least explored Andaman Sea.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Yanxian Zhu, Zhiliang He, Xiaowen Guo, Long Li, Sheng He, Jian Gao, Shuangjian Li, Huili Li
Summary: This study investigates the fluid evolution history of the hydrothermal dolomite reservoir in the Middle Permian Maokou Formation in the Sichuan Basin. The results reveal the diagenetic sequences, mineral origins, salinity history, and pressure evolution using various analytical techniques. The findings provide important insights into the gas charge, escape, and preservation conditions of the reservoir.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Rafaella de Carvalho Antunes, Julia Campos Guerrero, Ricardo Jorge Jahnert
Summary: This study presents a detailed sedimentary model and identifies various sedimentary facies associations in the coquina deposits of the Itapema Formation in the offshore pre-salt Buzios Field of the Santos Basin. These facies associations were primarily influenced by waves and currents and reflect a complex depositional system.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Kang Meng, Tongwei Zhang, Deyong Shao, Xiuyan Liu, Hui Song, Heng Peng
Summary: In this study, an integrated method of measuring optical reflectance and Raman spectroscopy is proposed to accurately determine the thermal maturity of Lower Cambrian shales in South China. The results show that this method is reliable and effective, and it has important implications for analyzing overmature shale.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Mohamed A. K. El-Ghali, Olga Shelukhina, Iftikhar Ahmed Abbasi, Mohamed S. H. Moustafa, Osman Salad Hersi, Numair A. Siddiqui, Khalid Al-Ramadan, Abdullah Alqubalee, Abdulwahab Muhammad Bello, Abduljamiu O. Amao
Summary: This study employs an integrated depositional and sequence stratigraphic approach to assess the control of diagenesis on reservoir porosity of a hybrid-energy delta system. The study focuses on the Barik Formation in the Haushi-Huqf region of Central Oman, which represents a highstand system tract of a hybrid-energy delta. The assessments reveal that the reservoir porosity is controlled by various degrees of diagenetic processes, including mechanically infiltrated clays and kaolinitization of silicate grains.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Xiaocan Yu, Chunlian Wang, Hua Huang, Kai Yan
Summary: Oilfield brines are a significant alternative lithium resource. This study investigates the metallogenic characteristics and enrichment process of oilfield brines from the Jianghan Basin, central China using chemical and multi-isotope data. The results suggest that lithium enrichment in these brines is the result of interaction with clastic host rocks and dilution by meteoric water.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Jianghao Qiao, Xiwu Luan, Thanuja D. Raveendrasinghe, Yintao Lu, Guozhang Fan, Xinyuan Wei, Long Jin, Jian Yin, Haozhe Ma, Lushan Jiang
Summary: This study investigates the Tanintharyi passive continental margin in the Andaman Sea and reveals the potential of the Oligocene/Early Miocene carbonate platform in the region as a significant hydrocarbon reservoir. It also examines the influence of changes in sedimentary facies and the tectonic setting of the Andaman Sea on the evolution of pockmarks.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Anastasios Nikitas, Georgios Makrodimitras, Maria V. Triantaphyllou, Nikolaos Pasadakis, Kimon Christanis, Stavros Kalaitzidis, Grigoris Rousakis, Ioannis Panagiotopoulos, Alexandra Gogou, Alexandros Papadopoulos, Efthimios Tartaras, Aristofanis Stefatos
Summary: Due to the lack of deep wells in the broader region, studying mud volcanic deposits can improve the geological understanding of the Mediterranean Ridge. In this study, biostratigraphic and geochemical analyses were performed on mud breccia deposits from five Mud Volcanoes in the central MR. The results indicate the origin of these deposits and provide insights into the source rock potential. Seismic data is also used to determine the distribution of major lithostratigraphic formations.
MARINE AND PETROLEUM GEOLOGY
(2024)