Article
Chemistry, Analytical
Kai Zhang, Baohai Tan, Wenxiu Zhang, Yuntao Sun, Jian Zheng, Yuanda Su, Xutang Liu, Gaofu Wu, Shoutao Xin
Summary: This article introduces a new acoustic logging while drilling (LWD) tool, including its design, core technologies, and test results. Experiments demonstrated that the tool obtained qualified data.
Article
Geochemistry & Geophysics
Ida Hooshyari-Far, Anton Kepic, Michael Carson
Summary: This article emphasizes the importance of analyzing the low-energy region of the gamma ray spectrum in borehole logging and airborne radiometric surveys for extracting useful information about earth properties. The HMI measurement, based on the ratio of counts in two energy regions, can be used as an indicator of heavy mineral content and changes in the average atomic number of rocks.
Article
Acoustics
Xin Fu, Yang Gou
Summary: This paper proposes a new transmitter transducer for an acoustic logging while drilling (ALWD) tool. The new transducer, which is cut into two parts with a buffer material in the middle, exhibits larger radial vibration displacement at the resonant frequency while significantly reducing longitudinal coupling vibration. COMSOL simulation is used to compare the differences in admittance and vibration displacement distribution between the new transducer and conventional transducers. Finite element simulation results show that the transducer with soft epoxy resin filling material of 6 mm height is the most effective. Sound field and well field experiments demonstrate that the new ALWD transducer achieves improved emission voltage response, output voltage, directivity, and reduced drill collar wave interference compared to conventional transducers.
Article
Geosciences, Multidisciplinary
M. Foschi, G. Etiope, J. A. Cartwright
Summary: Large microbial gas hydrate deposits in the Rakhine Basin, Bay of Bengal, are found to have migrated from a deeper petroleum system and play a significant role in the gas system. The detection of active free-phase gas migration towards the shallow gas hydrate stability zone indicates the potential environmental impact. These findings are crucial for understanding the origin and behavior of submarine methane-rich gas hydrates.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Emily Jackson, Heather Bedle, Thang Ha
Summary: This study proposes a method to identify gas hydrates in seismic data when the bottom-simulating reflector (BSR) is sparse or lacking. By measuring the attenuation response in the gas hydrate stability zone (GHSZ), the study shows that frequency-related variations are the major contributors to attenuation response, indicating that the GHSZ in the Pegasus Basin consists of discontinuous hydrates.
MARINE GEOPHYSICAL RESEARCH
(2023)
Article
Energy & Fuels
Ao-Song Zhao, Xiao He, Hao Chen, Xiu-Ming Wang
Summary: This paper proposes a hybrid modeling method to investigate the response characteristics of downhole acoustic telemetry (DAT) channels. By considering the transmission, reflection, and interconversion of drill-string and fluid waves, the proposed 1-D approximation model has been well validated by comparing it with 2-D finite-difference modeling. The study reveals that the complexity of channel response has been underestimated in the past, and ground-based channel measurements are unreliable. A non-coherent demodulation strategy is applied to address these channel characteristics.
Article
Energy & Fuels
Ruslan Gizatullin, Mikhail Dvoynikov, Natalya Romanova, Victor Nikitin
Summary: This article offers a detailed analysis of complications in drilling hydrate-bearing rocks in permafrost areas. The main goal is to develop recommendations to prevent gas occurrence and eliminate gas leakiness during drilling gas hydrate deposits. The study reveals that the injection rate and temperature of drilling mud play a crucial role in the process. It is recommended to maintain a flow rate of 0.30-0.45 m(3)/s and a temperature below 20 degrees C. By controlling these parameters, gas occurrence while drilling in gas hydrates can be avoided. The presence of gas hydrates can cause gas leakiness in the permafrost area, which can be addressed through colmatation using a solution of sodium silicate with 2% polymer.
Article
Energy & Fuels
Raj Kiran, Prabhat Dansena, Saeed Salehi, Vinay Kumar Rajak
Summary: This paper discusses the potential of geothermal energy as a carbon-neutral resource and proposes new solutions for the challenges in geothermal exploration. By applying machine learning algorithms and deep learning architectures, patterns in operational parameters are captured and classification predictors are built. Experimental results show that random forest and gradient boosting perform well in classification tasks.
Article
Engineering, Electrical & Electronic
Yang Gou, Xin Fu
Summary: An electrical impedance-matching network is proposed to achieve a broad transmitter transducer bandwidth for acoustic logging while drilling tool. The network is designed based on circuit equations and design indicators, and simulations and experiments verify its effectiveness in improving the transducer performance.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Environmental
Xinji Xu, Panlong Zhang, Xu Guo, Bin Liu, Lei Chen, Qingsong Zhang, Lichao Nie, Yi Zhang
Summary: This study conducted seismic forward-prospecting research in the Gaoligongshan Tunnel, combined with geological conditions to determine appropriate excavation strategies for safe and efficient tunnel construction.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Geochemistry & Geophysics
Song Xu, Zhihui Zou
Summary: In this study, a new signal processing technique based on supervirtual interferometry (SVI) theory is proposed for distinguishing and estimating formation acoustic properties from interfering signals in logging-while-drilling (LWD) acoustic measurements. waveform characteristics are analyzed using analytical and numerical modeling for different collar attention effects. The results show that identification of formation signals can be difficult, especially in the presence of poorly attenuated collar waves. The new technique is applied to synthetic and field LWD acoustic data to evaluate its validity and effectiveness, demonstrating the ability to extract formation properties in the presence of collar waves and drilling-related noise.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Energy & Fuels
Jianbao Fan, Wenxiu Zhang, Wenxuan Chen, Xinghan Li
Summary: Efficient and reliable inversion method for logging-while-drilling directional resistivity measurement is important due to the response complexity and real-time interpretation required by geosteering. A three-layer parametric inversion method based on deep learning has been developed to address this need. The method involves inversion of formation parameters and uncertainty estimation of inversed parameters, with the ability to remove low-quality boundaries, as shown in a synthetic example.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Sun Qifeng, Li Na, Duan Youxiang, Li Hongqiang, Tang Haiquan
Summary: This study proposes a method of applying artificial intelligence in the interpretation of azimuth gamma logging while drilling data, aiming to enhance the efficiency and accuracy of real-time data processing, meeting the needs of real-time geosteering in drilling operations.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2021)
Article
Energy & Fuels
Zhenguan Wu, Hu Li, Yujiao Han, Runren Zhang, Jun Zhao, Qiang Lai
Summary: This paper evaluates the effects of formation structure on directional electromagnetic logging while drilling (LWD) tools using an efficient 2.5D finite difference method (FDM) with non-uniform meshes and parallel computing. The numerical results show that the EM tools are sensitive to faults and are affected by sharp slope curved boundaries.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Jian Sun, Mingqiang Chen, Qi Li, Long Ren, Mengyuan Dou, Jixuan Zhang
Summary: This study utilized supervised learning, conventional logging interpretation technology, and big data concepts to predict lithology at horizontal well bits. By establishing databases and prediction models, the XGBoost model was identified as the most effective in real-time lithology prediction for horizontal well bits.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Geochemistry & Geophysics
Emma A. Oti, Ann E. Cook, Susan A. Welch, Julia M. Sheets, Dustin Crandall, Kelly Rose, Hugh Daigle
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2019)
Article
Geochemistry & Geophysics
Alexey Portnoy, Ann E. Cook, Derek E. Sawyer, Chen Yang, Jess I. T. Hillman, William F. Waite
EARTH AND PLANETARY SCIENCE LETTERS
(2019)
Article
Geosciences, Multidisciplinary
Alexey Portnov, Manasij Santra, Ann E. Cook, Derek E. Sawyer
MARINE AND PETROLEUM GEOLOGY
(2020)
Article
Multidisciplinary Sciences
Philip M. Barnes, Laura M. Wallace, Demian M. Saffer, Rebecca E. Bell, Michael B. Underwood, Ake Fagereng, Francesca Meneghini, Heather M. Savage, Hannah S. Rabinowitz, Julia K. Morgan, Hiroko Kitajima, Steffen Kutterolf, Yoshitaka Hashimoto, Christie H. Engelmann de Oliveira, Atsushi Noda, Martin P. Crundwell, Claire L. Shepherd, Adam D. Woodhouse, Robert N. Harris, Maomao Wang, Stuart Henrys, Daniel H. N. Barker, Katerina E. Petronotis, Sylvain M. Bourlange, Michael B. Clennell, Ann E. Cook, Brandon E. Dugan, Judith Elger, Patrick M. Fulton, Davide Gamboa, Annika Greve, Shuoshuo Han, Andre Huepers, Matt J. Ikari, Yoshihiro Ito, Gil Young Kim, Hiroaki Koge, Hikweon Lee, Xuesen Li, Min Luo, Pierre R. Malie, Gregory F. Moore, Joshu J. Mountjoy, David D. McNamara, Matteo Paganoni, Elizabeth J. Screaton, Uma Shankar, Srisharan Shreedharan, Evan A. Solomon, Xiujuan Wang, Hung-Yu Wu, Ingo A. Pecher, Leah J. LeVay
Article
Geosciences, Multidisciplinary
Carla Thomas, Stephen C. Phillips, Peter B. Flemings, Manasij Santra, Helen Hammon, Timothy S. Collett, Ann E. Cook, Tom Pettigrew, Mike Mimitz, Melanie Holland, Peter Schultheiss
Article
Geosciences, Multidisciplinary
Alexey Portnov, Ann E. Cook, Mahdi Heidari, Derek E. Sawyer, Manasij Santra, Maria Nikolinakou
Editorial Material
Geosciences, Multidisciplinary
Ray Boswell, Timothy S. Collett, Ann E. Cook, Peter B. Flemings
Article
Geosciences, Multidisciplinary
Peter B. Flemings, Stephen C. Phillips, Ray Boswell, Timothy S. Collett, Ann E. Cook, Tiannong Dong, Matthew Frye, David S. Goldberg, Gilles Guerin, Melanie E. Holland, Junbong Jang, Kevin Meazell, Jamie Morrison, Joshua O'Connell, Ethan G. Petrou, Tom Pettigrew, Peter J. Polito, Alexey Portnov, Manasij Santra, Peter J. Schultheiss, Yongkoo Seol, William Shedd, Evan A. Solomon, Carla M. Thomas, William F. Waite, Kehua You
Article
Geosciences, Multidisciplinary
Ann E. Cook, Matteo Paganoni, Michael Benedict Clennell, David D. McNamara, Michael Nole, Xiujuan Wang, Shuoshuo Han, Rebecca E. Bell, Evan A. Solomon, Demian M. Saffer, Philip M. Barnes, Ingo A. Pecher, Laura M. Wallace, Leah J. LeVay, Katerina E. Petronotis
GEOPHYSICAL RESEARCH LETTERS
(2020)
Article
Geochemistry & Geophysics
Hugh Daigle, Ann Cook, Yi Fang, Abhishek Bihani, Wen Song, Peter B. Flemings
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geosciences, Multidisciplinary
Peter B. Flemings, Ann E. Cook, Tim Collett, Ray Boswell
Article
Geosciences, Multidisciplinary
Emma A. Oti, Ann E. Cook, Stephen C. Phillips, Melanie E. Holland
Summary: This study develops a new method to estimate hydrate saturation in reservoirs using density-sensitive XCT scans and verifies its accuracy with quantitative degassing measurements. The results show that XCT analysis has the potential to nondestructively estimate hydrate saturation.
Article
Geosciences, Multidisciplinary
Myles T. Moore, Stephen C. Phillips, Ann E. Cook, Thomas H. Darrah
Summary: This study analyzed sediment samples collected from the Gulf of Mexico to determine the genetic source of natural gases in the GC 955 region. The results showed that the natural gases in the hydrates are predominantly of primary microbial origin. Additionally, a layer of thermogenic gas was found below the main hydrate-bearing interval.
Article
Geosciences, Multidisciplinary
Li Wei, Ann Cook, Kehua You
Summary: This study investigates gas hydrates at a site in Green Canyon Block 955 (GC 955) in the Gulf of Mexico. Different data sets suggest different potential methane migration mechanisms, with visible deeply rooted faults and dissolved methane sources indicating potential free gas migration into the hydrate reservoir. Numerical models confirm that free gas flow is required to form the high saturations of gas hydrate observed at GC 955.
Article
Geochemistry & Geophysics
Myles T. Moore, Stephen C. Phillips, Ann E. Cook, Thomas H. Darrah
APPLIED GEOCHEMISTRY
(2020)
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)
