Article
Geosciences, Multidisciplinary
Yuce Wang, Jian Cao, Keyu Tao, Chenjia Zhang, Baoli Xiang, Erting Li, Shuang Yu, Changchun Pan
Summary: This study investigates the characteristics and fluidity of lacustrine shale oil in the Jimusar sag of the Jung-gar Basin, China. The study finds that the organic matter precursor of the Lucaogou Formation is a salt-tolerant planktonic green algae, resulting in high-density and viscous crude oil. Despite lower thermal maturity, light crude oil still exists in this formation.
Article
Geosciences, Multidisciplinary
Guoping Liu, Zhijun Jin, Lianbo Zeng, Liliang Huang, Mehdi Ostadhassan, Xiaoyu Du, Guoqing Lu, Yunzhao Zhang
Summary: This study identifies fracture types and analyzes the development characteristics of different types in the deep continental shale of the Permian Lucaogou Formation. It also discusses the main controlling factors affecting fracture development and distribution. The results show that non-bed-parallel and bed-parallel fractures exist in deep continental shale oil reservoirs, with silty and dolomitic rocks promoting the development of non-bed-parallel fractures and higher TOC and argillaceous content promoting the formation of bed-parallel fractures, especially stylolites.
JOURNAL OF STRUCTURAL GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Shiju Liu, David Misch, Wenzhe Gang, Jie Li, Jun Jin, Yanjuan Duan, Baoli Xiang, Gang Gao, Youjin Zhang, Ming Wang, Keting Fan
Summary: The Middle Permian Lucaogou Formation in the Jimusaer Sag has good tight oil potential and is suitable for exploration and development. By analyzing the sedimentary environment and organic matter composition, it was found that the source rocks in this area have good hydrocarbon generation and expulsion capabilities.
ORGANIC GEOCHEMISTRY
(2023)
Article
Energy & Fuels
Xiaojun Wang, Yong Song, Xuguang Guo, Qiusheng Chang, Yuhua Kong, Menglin Zheng, Zhijun Qin, Xiaofa Yang
Summary: The dolomite content in the Lucaogou tight reservoir is positively correlated with porosity and permeability, suggesting that dolomite has a significant impact on reservoir quality. Sandy dolarenite and dolomitic siltstone with higher dolomite content have larger pores and throat radii, higher pore-throat network connection ratio, higher permeability, and better oiliness. Therefore, the quality of the Lucaogou tight reservoir is primarily controlled by the dolomite content.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Geography, Physical
Dadong Liu, Qingqing Fan, Chen Zhang, Yang Gao, Wei Du, Yan Song, Ziya Zhang, Qun Luo, Zhenxue Jiang, Zhixin Huang
Summary: This study systematically investigated the Lucaogou Formation in different sag areas of the southern Junggar Basin and found that it was generally deposited under semiarid to arid conditions with dysoxic-anoxic conditions prevailing. The salinity levels varied in different sag areas, with the Jimsar Sag exhibiting the highest salinity. The deposition of the Lucaogou Formation was influenced by the deglaciation of Gondwanaland, resulting in a lake transgression trend.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Energy & Fuels
Jingya Zhang, Mingliang Sun, Guangdi Liu, Zhe Cao, Yuhua Kong
Summary: The Lucaogou Formation in the Jimusaer Sag, Junggar Basin is an important source rock and tight oil-producing layer in China. The mixed source rocks are characterized by the mixed sedimentation of different materials, and can be divided into three types based on their composition. These rocks contain abundant organic matter and have different depositional environments depending on the section, which ultimately affect their hydrocarbon generation potential. The evolution of the lacustrine basin in response to climatic changes has led to different depositional models for the upper and lower sections of the Lucaogou Formation, making them favorable targets for tight oil exploration.
Article
Geosciences, Multidisciplinary
Xiangchun Chang, Tianjiao Liu, Bingbing Shi, Guanlong Zhang, Hongzhou Yu, Guo Chen, Pengfei Zhang
Summary: This study proposed a new evaluation index for shale oil potential (SOPI) to assess the Permian Lucaogou shales in the southeastern Junggar basin, combining various methods including rock-eval pyrolysis, organic petrography, total organic carbon content, organic elements, vitrinite reflectance, and gas chromatography-mass spectrometry. The SOPI values were calculated using geochemometric methods and compared with previous evaluation parameters. The results showed consistency and revealed that the Qitai area has the highest shale oil exploration potential, followed by the Jimusaer, Miquan, and Mulei areas, while the Chaiwopu and Shiqiantan areas have the lowest shale oil potential.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Jingmin Wang, Denglin Han, Yuan Deng, Wei Lin, Ao Su, Chenchen Wang, Jizhen Zhang, Juan Zhang
Summary: The characteristics and formation mechanisms of shale oil reservoirs in different sweet spots of the Lucaogou Formation in the Jimsar Depression were studied. The results showed significant differences between the upper and lower sweet spots, including the types and quality of dissolution pores, as well as the scale and maturity of the source rocks.
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
Chemistry, Multidisciplinary
Lianhua Hou, Xia Luo, Zhongying Zhao, Lijun Zhang
Summary: The Permian Lucaogou Formation in the Jimsar Sag of the Junggar Basin, NW China, is a significant area for oil exploration and production in lacustrine shale sequences. Commercially extractable oil is found in this heterogeneous formation, with different reservoir properties influencing oil production from shale or tight reservoirs. The study focuses on petrological and mineralogical characteristics, source rock properties, and molecular biogeochemistry of core extracts and crude oils to identify potential sweet spots for shale oil exploration and production.
Article
Geosciences, Multidisciplinary
Cornel Olariu, Zhijie Zhang, Chuanmin Zhou, Xuanjun Yuan, Ronald Steel, Si Chen, Jinyu Zhang, Dawei Cheng
Summary: The Junggar Basin in China is a large and long-lived Late Paleozoic lacustrine basin, where research findings indicate the interactions of coarse and fine-grained alluvial-to-lacustrine depositional cycles, influenced by climate-driven lake-level changes.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Ming Qi, Changcheng Han, Cunfei Ma, Geng Liu, Xudong He, Guan Li, Yi Yang, Ruyuan Sun, Xuhui Cheng
Summary: This study investigates the diagenesis and diagenetic facies logging of the Permian Lucaogou Formation in the Jimsar Sag, providing insights into the reservoir characteristics and establishing a diagenetic facies logging recognition model. Dissolution facies are identified as the dominant diagenetic facies in the study area, which is valuable for the exploration of dominant reservoirs in future stages.
Article
Geosciences, Multidisciplinary
Xiangye Kong, Jianhui Zeng, Xianfeng Tan, Kun Ding, Qun Luo, Qianyou Wang, Ming Wen, Xin Wang, Maoyun Wang
Summary: This study investigated natural tectonic fractures in tight oil reservoirs in the Junggar Basin, China. Different stages of fracture development showed varying calcite filling temperatures, with Stages 2-4 having minimal calcite fillings, which are favorable for oil and gas migration and accumulation.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Jin Lai, Tianyu Bai, Hongbin Li, Xiaojiao Pang, Meng Bao, Guiwen Wang, Bingchang Liu, Shichen Liu
Summary: Unconventional oil and gas resources require the establishment of a key well with comprehensive descriptions of lithology, reservoir properties, hydrocarbon-bearing properties, electronic well log responses, source rock properties, brittleness, and in situ stress magnitude and direction. Through the use of cores, thin sections, scanning electron microscopy (SEM) and comprehensive well log suites, the key well can be built for effective exploration and production of unconventional hydrocarbon resources.
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2023)
Article
Geosciences, Multidisciplinary
Wenren Zeng, Zhihuan Zhang, Boran Wang, Xuan Chen, Ruihui Zheng, Guobin Fu, Ying Jin
Summary: This study reveals the formation mechanism of organic-rich mixed sedimentary rocks in the Jimsar Sag, Junggar Basin. The results show that changes in paleoclimatic conditions and periodic hydrothermal activity controlled the formation of different lithologies, with high primary productivity and good preservation conditions promoting the accumulation of organic matter in these rocks.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geology
Dongdong Liu, Chen Zhang, Canxing Li, Jing Guo, Ziya Zhang, Zhixin Huang, Zhankun Pan
Summary: The study reveals that the granitic plutons were formed from different crustal materials; while the granites exhibit geochemical characteristics similar to A-type granitoids, the quartz monzodiorites likely originated from subducted oceanic crust.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Energy & Fuels
Jinxiong Shi, Lianbo Zeng, Shaoqun Dong, Jipeng Wang, Yunzhao Zhang
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2020)
Article
Geosciences, Multidisciplinary
Jinxiong Shi, Lianbo Zeng, Xiangyuan Zhao, Yunzhao Zhang, Jipeng Wang
MARINE AND PETROLEUM GEOLOGY
(2020)
Article
Geosciences, Multidisciplinary
Yunzhao Zhang, Lianbo Zeng, Qun Luo, Rukai Zhu, Shouxu Pan, Quanqi Dai, Jinxiong Shi, Jianhua Qin, Xiang Xu
GEOLOGICAL JOURNAL
(2020)
Article
Geosciences, Multidisciplinary
Yanqing Shi, Hancheng Ji, Jingwei Yu, Pengfei Xiang, Zhibo Yang, Dongdong Liu
MARINE AND PETROLEUM GEOLOGY
(2020)
Article
Geochemistry & Geophysics
Jia Lu, Chen Zhang, Dongdong Liu
Article
Geosciences, Multidisciplinary
Yunzhao Zhang, Lianbo Zeng, Wenya Lyu, Dongsheng Sun, Shuangquan Chen, Cong Guan, Lei Tang, Jinxiong Shi, Junhui Zhang
Summary: This study focused on the influences of natural fractures on tight gas migration and production, revealing characteristics and attributes of fractures and their relationships with tight gas production. It is expected to guide future exploration and development of tight gas with similar geological backgrounds.
GEOLOGICAL MAGAZINE
(2021)
Article
Geosciences, Multidisciplinary
Lianbo Zeng, Wenya Lyu, Yunzhao Zhang, Guoping Liu, Shaoqun Dong
Summary: The study reveals that multi-scale faults and fractures have significantly different effects on the oil enrichment and production of tight sandstone reservoirs, impacting the development and production efficiency of oil fields. Analyzing the impact of fractures and faults of different scales on reservoirs can better guide the exploration and development of similar reservoirs.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Energy & Fuels
Chen Zhang, Dong-Dong Liu, Zhen-Xue Jiang, Yan Song, Qun Luo, Xin Wang
Summary: This study investigates the formation mechanisms and effects of fractures on shale oil accumulation in the Middle Permian Lucaogou Formation in the Jimsar Sag of the Junggar Basin. Through the use of various techniques, the study defines the timing of fracture formation, traces the source of fluids filling the fractures, and elucidates the genetic mechanisms of fractures. The results show that fractures were mainly formed in the Late Permian, Late Jurassic, and Early Cretaceous, coinciding with the peak of oil generation and expulsion in the shale.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Geography, Physical
Dadong Liu, Qingqing Fan, Chen Zhang, Yang Gao, Wei Du, Yan Song, Ziya Zhang, Qun Luo, Zhenxue Jiang, Zhixin Huang
Summary: This study systematically investigated the Lucaogou Formation in different sag areas of the southern Junggar Basin and found that it was generally deposited under semiarid to arid conditions with dysoxic-anoxic conditions prevailing. The salinity levels varied in different sag areas, with the Jimsar Sag exhibiting the highest salinity. The deposition of the Lucaogou Formation was influenced by the deglaciation of Gondwanaland, resulting in a lake transgression trend.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Energy & Fuels
Yonghui Chen, Dadong Liu, Qingqing Fan, Chen Zhang, Yingyan Li, Yuan Deng, Wei Du, Wei Yin, Ziya Zhang, Li Liu, Qun Luo
Summary: In this study, the oil mobility in fine-grained sedimentary rocks from the Lucaogou Formation was systematically characterized using various techniques. The results showed that the content of adsorbed and movable oil varied with organic matter richness. Permeability had a greater impact on movable fluid saturation than porosity. Good throat radius and pore connectivity were found to be conducive to oil flow.
Article
Energy & Fuels
Song Yan, Luo Qun, Jiang Zhenxue, Yang Wei, Liu Dongdong
Summary: This study investigates tight oil in three different basins, revealing that tight oil accumulates, advances, diffuses, charges, and migrates through fractures and pores. The study also establishes two accumulation models and highlights the importance of fractures and pores in controlling tight oil enrichment.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2021)
Article
Geochemistry & Geophysics
C. Zhang, D. Liu, X. Zhang, C. Spencer, M. Tang, J. Zeng, S. Jiang, M. Jolivet, X. Kong
GEOCHEMICAL PERSPECTIVES LETTERS
(2020)