Article
Energy & Fuels
Zhi-Qi Guo, Tao Zhang, Cai Liu
Summary: The identification of hydrocarbons in shale oil reservoirs using seismic methods is challenging due to the similarity in elastic properties of oil-bearing and water-bearing shales, as well as the complexity of organic matter properties. However, the inelastic properties associated with oil saturation can be utilized for hydrocarbon identification. A seismic inversion scheme based on fluid dispersion attribute was proposed, which showed better results in estimating hydrocarbon enrichment compared to conventional approaches.
Article
Energy & Fuels
Fang Ouyang, Xin-Ze Liu, Bin Wang, Zi-Duo Hu, Jian-Guo Zhao, Xiu-Yi Yan, Yu Zhang, Yi-He Qing
Summary: The translation title is "Translation:", the Chinese summary title is "Chinese Summary:", the English summary title is "English Summary:", and the rating title is "Rating:"
Article
Multidisciplinary Sciences
Xinpeng Pan, Dazhou Zhang, Pengfei Zhang
Summary: This study proposes a more robust azimuth-dependent seismic inversion method by combining Bayesian inference and joint time-frequency-domain inversion theory, introducing regularizations to improve inversion reliability. The comparison of frequency bandwidth under different noise levels demonstrates that joint time-frequency-domain inversion may provide a more stable technique for fracture detection in fractured reservoirs.
SCIENTIFIC REPORTS
(2021)
Article
Energy & Fuels
Pin-Bo Ding, Fei Gong, Feng Zhang, Xiang-Yang Li
Summary: This study demonstrates the importance of using a physical model to observe the seismic responses of shale properties, showing that clay content has a significant impact on rock elastic properties. By analyzing seismic data and applying inversion methods, accurate estimates of elastic properties and anisotropy parameters for shale formations can be obtained.
Article
Geochemistry & Geophysics
Xiao Chen, Zhaoyun Zong, Yinghao Zuo
Summary: Young's modulus and the Poisson ratio are important parameters for shale reservoir identification and oil and gas detection. The broadband inversion approach combines seismic ultralow-frequency information with inversion results in the complex frequency domain, improving the stability, reliability, and resolution of the inversion. However, current amplitude variation with offset (AVO) inversions mostly rely on linear approximations, and there are few exact nonlinear or broadband inversion methods. We propose a new exact reflection coefficient equation based on the Zoeppritz equation for the inversion of Young's modulus, Poisson ratio, and density in the broadband complex domain. This method provides a theoretical basis for evaluating reservoir brittleness and compressibility, as well as a new approach for shale gas reservoir prediction and sweet spot identification. The accuracy and rationality of this method are validated using synthetic and field data examples.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Geochemistry & Geophysics
Nisar Ahmed, Wiktor Waldemar Weibull, Beatriz Quintal, Dario Grana, Tuhin Bhakta
Summary: This paper presents a gradient descent optimization-based inversion technique to predict the unknown model properties in AVO data, including P- and S-wave velocities, quality factors and density. The proposed inversion method is tested on synthetic seismic data and reliably retrieves the unknown elastic and an-elastic properties.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geosciences, Multidisciplinary
Ahmed Zidan, Yunyue Li, Arthur Cheng
Summary: This paper proposes a method to improve the amplitude inversion problem by using gradient descent and regularization functions, which enhances the consistency between the inversion results and the a priori geological information. The method is successfully applied to estimate the elastic and seismic anisotropy parameters of shale formations.
JOURNAL OF APPLIED GEOPHYSICS
(2023)
Article
Geochemistry & Geophysics
Zhiqiang Wang, Jinghuai Gao, Haixia Zhao, Xiaolong Zhao
Summary: Estimating elastic parameters is crucial for reservoir characterization. Traditional prestack inversion methods heavily rely on well logs, making it hard to obtain reliable results with limited well data. To address this, we propose a joint inversion strategy that combines the advantages of post-stack and prestack inversion.
Article
Environmental Sciences
Zhiqi Guo, Danyu Zhao, Cai Liu
Summary: This paper proposes an improved fluid dispersion attribute method for gas identification in tight sandstone reservoirs. By incorporating the decoupled fluid-solid seismic amplitude variation with offset representation into the frequency-dependent inversion scheme, a more accurate fluid dispersion attribute is obtained. Numerical analyses, synthetic data tests, and field data applications all validate the effectiveness of this method.
Article
Geosciences, Multidisciplinary
Kun Luo, Zhaoyun Zong
Summary: This study proposes a novel probabilistic Fisher discriminant approach for estimating shale oil sweet spots, successfully applying multiple attributes from real pre-stack seismic data sets to delineate the sweet spots of shale oil reservoirs.
FRONTIERS OF EARTH SCIENCE
(2022)
Article
Energy & Fuels
Yan-Xiao He, Xin-Long Li, Gen-Yang Tang, Chun-Hui Dong, Mo Chen, Shang-Xu Wang
Summary: This study presents an improved AVO modeling method that accurately considers the impacts of frequency-dependence and incident-angle variations on reflection responses. By utilizing a frequency-domain propagator matrix method, it provides a better understanding of reflective characteristics in fractured porous media and enhances seismic interpretation of reservoirs.
Article
Geochemistry & Geophysics
Lingqian Wang, Hui Zhou, Hengchang Dai, Bo Yu, Wenling Liu, Ning Wang
Summary: Seismic inversion is a severely ill-posed problem, but regularization techniques can impose certain characteristics on inversion results to obtain a stable and unique solution. The newly developed acoustic impedance inversion method based on a patch-based Gaussian mixture model (GMM) provides more impedance structure details and enhances the stability of the inversion result.
Article
Geochemistry & Geophysics
Guangsen Cheng, Xingyao Yin, Zhaoyun Zong, Tongxing Xia, Jianli Wang, Haojie Liu
Summary: Compared with the plane-wave reflection coefficient, the spherical-wave reflection coefficient provides a more accurate description of the reflected wavefield, especially at low seismic frequencies and short travel distances. However, the practical application of spherical-wave inversion in multilayer elastic media is still in its early stages. This study develops a complex convolution model and a simple harmonic superposition method to obtain synthetic seismograms in multilayer elastic media using the amplitude and phase information of the spherical-wave reflection coefficient.
Article
Geochemistry & Geophysics
Yajun Tian, Alexey Stovas, Jinghuai Gao, Chuangji Meng, Chun Yang
Summary: The article proposes a new workflow based on deep neural network for extracting reservoir fluid parameters from FAVO data, and successfully applies it to tight sandstone gas reservoirs. The method achieves accurate prediction and inversion of reservoir parameters by generating synthetic data and applying optimization basis wavelet transform.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Geochemistry & Geophysics
Dongyong Zhou, Xiaotao Wen, Xilei He, Zhenhua He
Summary: In this study, second-order approximate expressions of the P- and SV-wave reflection coefficients at the solid/solid media interface were derived, and it was found through verification experiments that their accuracy was significantly higher than that of the first-order approximations. Furthermore, different pseudosecond-order approximations of the ray parameter were proposed, which have positive implications for improving the accuracy of amplitude-variation-with-offset inversion.
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)