Article
Geosciences, Multidisciplinary
Zhen Qiu, Bei Liu, Bin Lu, Zhensheng Shi, Zhiyang Li
Summary: This study focused on the depositional and diagenetic processes controlling the fabric and petrophysical properties of black shales through the analysis of the Wufeng-Longmaxi Shale. It was found that the studied shale is mainly composed of over-mature black shales with organic matter dominated by pyrobitumen and graptolite, while minerals consist of quartz, carbonates, and clay minerals. Vertical variations in lithofacies and mineral content exhibited three cycles, likely corresponding to three transgressive-regressive cycles.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Engineering, Environmental
Wenbin Jiang, Gaohui Cao, Chao Luo, Mian Lin, Lili Ji, Ji Zhou
Summary: The study investigated the relationship between the composition of Wufeng-Longmaxi Formation shale samples in Sichuan Basin and methane adsorption characteristics, establishing a composition-based methane adsorption model. Differences in clay contribution to methane adsorption for different sublayers were revealed, aiding in improving the accuracy of shale reservoir evaluation.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Geosciences, Multidisciplinary
Jing Wu, Chao Liang, Renchao Yang, Jun Xie
Summary: This study examines the occurrence and importance of organic matter-mineral associations (OMMA) in shale gas reservoirs in the Sichuan Basin, identifying the impact of different types of OMMA on reservoir quality. The research also identifies four important lithofacies and highlights the heterogeneous distribution of OMMA in influencing hydrocarbon generation and gas storage conditions among different lithofacies.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Jianlin Guo, Chengye Jia, Dongbo He, Fankun Meng
Summary: The study proposed classification criteria for net pay of shale gas reservoirs in the Shunan area of the Sichuan Basin, based on the analysis of porosity, gas saturation, density of rock, brittleness index, and gas content. The application of gas content and brittleness index parameters reflects reservoir resource basis and fracability respectively. The net pay can be classified into three types based on the ranges of these two parameters, with implications for testing production and economic benefits.
Article
Geosciences, Multidisciplinary
Yang Wang, Hongfei Cheng, Qinhong Hu, Luofu Liu, Lewei Hao
Summary: The study investigated the impact of diagenesis on pore systems in different lithofacies of Wufeng-Longmaxi shale from Sichuan Basin, China. Different lithofacies showed varying diagenetic pathways and evolution of pore systems under the same burial history. Diagenesis played a crucial role in determining the final status of the initial pore space and controlling the distribution of migrated OM, influencing the development of dominant OM pores in the entire pore spectrum.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Wenping Liu, Juan Wu, Hua Jiang, Zheng Zhou, Chao Luo, Wei Wu, Xiaojia Li, Shugen Liu, Bin Deng
Summary: This study examines the relationship and multi-stage evolution between the upper Ordovician Wufeng and lower Silurian Longmaxi formations at the Changning shale gas field in southern Sichuan basin. The research utilizes low-temperature thermochronological data and structural evolution to analyze the rapid exhumation and history of the field. The results suggest a four-stage thermal evolution and significant impact of pressure index changes on shale gas enrichment.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Energy & Fuels
Xingxing Kong, Shuangfang Lu, Dianshi Xiao, Hongjun Fan, Pengfei Mu, Shu Jiang
Summary: Shale gas resources provide new impetus for alleviating the contradiction between China's oil and gas supply and demand. Understanding the occurrence mechanism of adsorbed gas can help in the better development and utilization of shale gas resources. The experiments conducted in this study revealed that nanopores dominate shale pores, with Total Organic Carbon (TOC) playing an important role in controlling specific surface area and methane adsorption capacity. Micropores in organic matter provide the main specific surface area and adsorption sites for methane adsorption, which is mainly multilayer adsorption and micropore filling in shale.
Article
Geochemistry & Geophysics
Wei Wang, Dahua Li, Lijun Cheng, Ye Zhang, Jinxi Wang, Zhiping Zhang, Hualian Zhang, Dongxin Guo, Yuelei Zhang, Qing Hua, Jun Liu
Summary: This study provides a comprehensive assessment of the petrophysical characterization and gas accumulation of WL shale in the Sichuan Basin. The results indicate that the bottom section of the WL shale is better suited for hydraulic fracturing and has higher hydrocarbon generation ability and dry gas content.
Article
Geosciences, Multidisciplinary
Jing Wu, Chao Liang, Ren-Chao Yang, Zongquan Hu, Wenjin Li, Jun Xie
Summary: The Late Ordovician-Early Silurian sedimentary succession in the Sichuan Basin, China, provides valuable information about the changes in sedimentary environments. The mineral composition and lithofacies of the shales in this region reflect these changes. The study analyzes the main minerals present (quartz, clay minerals, and carbonate) and identifies five major lithofacies. By examining various proxies, such as provenance indicators, chemical index of alteration, paleoproductivity proxies, redox condition indicators, proxies of detrital influx, and sedimentation rate, the paleoenvironment is analyzed. The study reveals the relationship between environmental changes and shale mineral composition and lithofacies.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Zhongliang Ma, Jingqiang Tan, Lunju Zheng, Baojian Shen, Zhanghu Wang, Asim Shahzad, Irfan U. Jan, Hans-Martin Schulz
Summary: The study evaluated the generation and preservation potential of shale gas in the Wufeng-Longmaxi Formation shale by conducting semiclosed hydrous pyrolysis experiments, finding that retained oil is the primary source of gas and a TOC content of 1.5% meets the evaluation standard for favorable marine shale gas play areas in China.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Haikuan Nie, Quanyou Liu, Wei Dang, Pei Li, Haikun Su, Hanyong Bao, Liang Xiong, Zhujiang Liu, Chuanxiang Sun, Peixian Zhang
Summary: China's helium resource heavily relies on imports. Shale reservoirs rich in organic matter and U/Th typically contain helium, with low content but large total reserves. Therefore, developing and utilizing shale-type helium resources effectively is a practical way to enhance helium resource security in China. This study analyzed the generation mechanism, source and content, migration modes and pathways, controlling factors, distribution pattern, and resource potential of helium in the Wufeng-Longmaxi shale of the Sichuan Basin and its periphery. Countermeasures for shale-type helium exploration and development were also proposed. The results indicate that the Wufeng-Longmaxi shale has high U and Th content and great helium generation ability. The helium is sourced from the crust and characterized by self-generation, self-storage, and wide distribution. The helium resource potential is determined by its content and the resources of associated natural gas.
SCIENCE CHINA-EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
Zhibo Zhang, Yinghai Guo, Difei Zhao, Jiaming Zhang, Chunlin Zeng, Yan Li
Summary: The coupling relationships of weathering indicators, terrigenous debris input indicators, paleoclimate, redox condition indicators, U-Mo covariance model, Mo/TOC relationship, and paleoproductivity indicators are investigated by analyzing sedimentation cycles and major trace elements of the Youc well 2 in the southeast Sichuan Basin. The results show that weathering is stronger at the bottom as the climate shifts from warm-wet to cold-dry, and the seawater goes through an oxidic-anoxic-oxidic-anoxic environment. In the middle and upper part, as the climate becomes dry and cold, and the seawater is in an anoxic-oxidic environment, primary productivity and material source input gradually decreases.
Article
Geochemistry & Geophysics
Zichun Liu, Rong Peng, Xiangyang Li, Xiangdong Du, Zhenyu Zhu, Xin Li, Huafei Li
Summary: Analyzing the pattern of wave velocity is crucial for velocity prediction and amplitude-versus-offset analysis in unconventional seismic exploration. This study experimentally evaluated several parameters of shale, including the maturity and microstructure of organic matter, wave velocity, mineral composition, and density. The obtained data were analyzed together with numerical calculations and previous experimental results, and a theoretical model was established. The study provides valuable data and a theoretical basis for seismic interpretations in the study area.
JOURNAL OF GEOPHYSICS AND ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Shunlin Tang, Yuxiang Ding, Guangyou Zhu, Xinbin Feng, Huaishun Zhang, Penggao Li
Summary: Little is known about the non-traditional stable isotopes of mercury in natural gas, especially in shale gas. This study extracted mercury from shale gas in the Sichuan Basin and analyzed its content and stable isotope composition. The results suggest that terrestrial target strata with abundant algae may be the target for terrestrial oil and gas exploration.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
Kui Xiang, Liangjun Yan, Gongxian Tan, Yuanyuan Luo, Gang Yu
Summary: This study investigated the electrical anisotropy characteristics of shale reservoirs in southern Sichuan, exploring the influencing factors and laws of complex resistivity anisotropy, and established an evaluation model. The research results have formed a set of testing methods and analysis techniques for electrical anisotropy of shale reservoirs, mainly based on complex resistivity parameter testing.
Article
Geosciences, Multidisciplinary
Bang Zeng, Meijun Li, Xin Wang, Fangzheng Wang, Chenglin Gong, Jin Lai, Yang Shi
Summary: This study investigates the geochemical features and spatial distribution of effective source rocks in the Fushan Depression using mudstone samples, well-logging curves, and seismic sections. The results show that the good hydrocarbon generation potential source rocks are mainly distributed in different systems tracts and their occurrence is controlled by thermal maturity. The southern slope has fewer hydrocarbon accumulations.
GEOLOGICAL JOURNAL
(2022)
Article
Geosciences, Multidisciplinary
Jin Lai, Xiaojiao Pang, Meng Bao, Bing Wang, Jianan Yin, Guiwen Wang, Xuechun Fan
Summary: Diagenesis plays a significant role in controlling reservoir quality. This study investigated the diagenesis of Paleogene sandstones in the Bohai Bay Basin, China using various testing methods. The results reveal the diagenetic dissolution along bedding planes, with feldspar grains experiencing a high degree of dissolution. Grain size and bedding structure are important factors influencing the dissolution process. These findings contribute to a better understanding of diagenetic models and have implications for reservoir quality prediction and resource assessments.
FRONTIERS OF EARTH SCIENCE
(2022)
Article
Chemistry, Analytical
Ming Guan, Xiaoping Liu, Zhijun Jin, Jin Lai, Biao Sun, Panpan Zhang, Kefei Chen
Summary: This study investigates the variation of pore structure heterogeneity during thermal maturation in shale samples. It combines multifractal theory with nitrogen adsorption-desorption tests to determine the governing factors. The study finds that the increasing thermal maturity leads to changes in pore structure heterogeneity, influenced by the volume difference between different types of pores.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Agricultural Engineering
Weipeng Pan, Ziyi Wang, Wenjuan Liu, Jian Lin
Summary: In this study, lignin fibers were prepared using a centrifugal spinning method to enhance its adsorption capacity for Cr(VI). The addition of sodium dodecyl sulfate and its subsequent dissolution during adsorption further improved the Cr(VI) adsorption capacity. These findings are significant for the application of lignin adsorbent materials in wastewater treatment.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Geosciences, Multidisciplinary
Xiaojiao Pang, Guiwen Wang, Lichun Kuang, Fei Zhao, Chaoliu Li, Chongyang Wang, Mei Zhang, Jin Lai
Summary: Lamellation fractures have significant effects on reservoir quality and hydraulic fracturing engineering in shale oil reservoirs. They are parallel along weak bedding planes and favor the connectivity of pores and throats, leading to high reservoir quality in shale oil reservoirs.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Jin Lai, Guiwen Wang, Qixuan Fan, Fei Zhao, Xin Zhao, Yuhang Li, Yidi Zhao, Xiaojiao Pang
Summary: This paper discusses the scientific interpretation of geophysical well log data, highlighting typical misunderstandings and proposing countermeasures. Factors affecting data acquisition and the applications of well logs in structural geology, sedimentary geology, and petroleum geology are summarized. The review also provides insights into solving geological issues using well logs based on published papers and personal experiences. This study is highly important for petrophysicists and geologists in interpreting geophysical well log data and addressing geological problems.
SURVEYS IN GEOPHYSICS
(2023)
Article
Computer Science, Information Systems
Ziyi Wang, Xiaoyu He, Zhizhen Zhang, Yishuo Zhang, Zhen Cao, Wei Cheng, Wendong Wang, Yong Cui
Summary: Driven by decreasing camera prices and advanced video inference algorithms, video cameras are widely used for live video analytics. However, real-time video analysis presents challenges to current network and computation systems. In order to balance accuracy, bandwidth usage, and latency, this study proposes EVA, an edge-assisted real-time video analytics framework. EVA utilizes computationally weak cameras and powerful edge servers to achieve video analytics with desired accuracy and latency. With the help of fine-grained transmission units and redundancy exploitation, EVA reduces bandwidth usage. Experimental results demonstrate that EVA achieves high accuracy while reducing bandwidth usage by up to 90% compared to recent baselines on various video genres.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Article
Energy & Fuels
Jin Lai, Xiaojiao Pang, Xin Zhao, Yidi Zhao, Guiwen Wang, Yuyue Huang, Hongbin Li, Yuhang Li
Summary: The method and theoretical system of well logging geology have been widely used but there are frequent misunderstandings due to the different response sensitivity of different well logging series to geological information and the mismatching between geophysical properties of multiple well logs and geological genesis of rocks. It is crucial to analyze typical misunderstanding cases and explore scientific ideas and countermeasures.
NATURAL GAS INDUSTRY B
(2023)
Article
Environmental Sciences
Hongcong Guo, Yingna Sun, Yun Teng, He Dong, Hui Li, Liquan Wang, Ziyi Wang, Jianwu Yang
Summary: In order to alleviate the burden on Harbin's water resources and improve the environment, it is important to analyze the key factors determining the use of unconventional water resources in the city and allocate them reasonably among different industries. This study uses a BP neural network model to predict the potential utilization of unconventional water resources in the planning year (2025), evaluates water-using industries using a gray correlation analysis model, and determines the main influencing factors and weights of key indicators through an unconventional water resource allocation scheme. The findings show a strong correlation between Harbin's investment and construction level, economic efficiency, cost, water demand level, social factors, and a low level of utilization of unconventional water resources in the city.
Article
Geosciences, Multidisciplinary
Jin Lai, Fei Zhao, Mei Zhang, Tianyu Bai, Yuyue Huang, Dong Li, Guiwen Wang, Ziqiang Qin
Summary: Research shows that fracture porosity can become very high in ultra-deep burial conditions, especially in situations with low stress difference and high dissolution.
GEOSCIENCE FRONTIERS
(2023)
Proceedings Paper
Computer Science, Hardware & Architecture
Ziyi Wang, Songyu Zhang, Jing Cheng, Zhixiong Wu, Zhen Cao, Yong Cui
Summary: This paper investigates the configuration problem in serverless-based video analytics and proposes an algorithm that can efficiently adapt configurations. The experimental results demonstrate that the algorithm can greatly reduce computation costs while maintaining accuracy.
2023 IEEE 43RD INTERNATIONAL CONFERENCE ON DISTRIBUTED COMPUTING SYSTEMS, ICDCS
(2023)
Article
Energy & Fuels
Xiao-Jiao Pang, Gui-Wen Wang, Li-Chun Kuang, Jin Lai, Yang Gao, Yi-Di Zhao, Hong-Bin Li, Song Wang, Meng Bao, Shi-Chen Liu, Bing-Chang Liu
Summary: Fine-grained sedimentary rocks have gained attention as important reservoirs and source rocks for shale oil and gas. This study focuses on the recognition of centimeter-scale laminae using various methods such as core observation, thin section, X-ray diffraction, conventional log analysis, and image logs. The results provide insights into the prediction of multiscale laminae structure and assist in sweet spots prediction.
Article
Geochemistry & Geophysics
Jin Lai, Dong Li, Yong Ai, Hongkun Liu, Deyang Cai, Kangjun Chen, Yuqiang Xie, Guiwen Wang
Summary: This study comprehensively analyzes the relationship between diagenetic processes and structural pattern, fractures, and in situ stress in the Lower Cretaceous Bashijiqike Formation of the Kuqa Depression. The results reveal the presence of various pore spaces, mechanical compaction, dissolution associated with fractures, and the influence of in situ stress on the formation of intergranular pores and fractures. These findings contribute to predicting reservoir quality and reducing uncertainty in deep natural gas exploration in the Kuqa Depression.
Article
Energy & Fuels
Jin Lai, Bing-Chang Liu, Hong-Bin Li, Xiao-Jiao Pang, Shi-Chen Liu, Meng Bao, Gui-Wen Wang
Summary: This study utilizes core, thin section, conventional, and image log data to investigate the distribution of fractures in the fine-grained sedimentary rocks of the Permian Lucaogou Formation in Jimusar Sag. The results reveal the presence of tectonic inclined fractures, bedding parallel fractures, and abnormal high-pressure fractures. Bedding parallel fractures are abundant but mostly sealed by carbonate minerals and bitumen. These fractures lead to a rapid decrease in resistivity and can be identified on image logs. The distribution of fractures aligns with bedding planes and is influenced by the density of bedding planes. This research provides valuable insights for optimizing sweet spots, improving fracturing designs, and optimizing well spacing in fine-grained sedimentary rocks.
Article
Energy & Fuels
Xiao-Ping Liu, Ming Guan, Zhi-Jun Jin, Zhe Cao, Jin Lai, Lun-Ju Zheng, Wen-Qi Li, Biao Sun, Shan-Yong Chen
Summary: Pyrolysis experiments were conducted on lacustrine organic-rich shale to investigate the impact of hydrocarbon generation on shale pore structure evolution. The results show that thermal evolution controls the transformation of organic matter, characteristics of hydrocarbon products, and changes in pore structure.
