Article
Energy & Fuels
Jing-Dong Liu, Cun-Jian Zhang, You-Lu Jiang, Guo-Shuai Bai
Summary: This paper presents a method for evaluating overpressure and its effect on natural gas charging in tight sandstone in a compressional basin using the example of the Xujiahe Formation in the northeastern Sichuan Basin. The study reveals that hydrocarbon generation and tectonic compression are the main causes of overpressure. The residual pressure difference between the source rocks and reservoir is the major driving force for tight sandstone gas charging. The research provides important insights into evaluating overpressure and pressure difference, as well as investigating natural gas charging space in compressed basins.
Article
Green & Sustainable Science & Technology
Jiujie Cai, Haibo Wang, Fengxia Li
Summary: This paper proposes a novel evaluation method to analyze the post fracturing productivity controlled by complex fault fracture zones in tight reservoirs. The results show that hydraulic fractures connect the natural fractures in fault-fracture zones and increasing net pressure within fractures will significantly enhance the complexity of fracturing fractures in shale gas reservoirs. The systematic evaluation method in this study provides an accurate measurement for fracturing in tight reservoirs and is a critical and helpful component of sustainable development in the natural gas industry.
Article
Geosciences, Multidisciplinary
Jingdong Liu, Lei Li, Cunjian Zhang, Youlu Jiang, Rudy Swennen, Chengjin Zhao, Shuai Hou
Summary: This study investigates the pore structure and fluid flow behavior in tight sandstone reservoirs of the Upper Triassic Xujiahe Formation in the northern Sichuan Basin. Different types of sandstones possess different pore-throat systems, with clay mineral-related pores and throats being the key factors affecting the pore structure and fluid flow behavior. The findings provide valuable insights for reservoir characterization and development.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Kaijun Tan, Jun Yao, Juan Chen, Dahai Tang, Yang Qin, Qingpeng Wu
Summary: This study systematically investigated the controlling effect of source-reservoir assemblage on gas accumulation in the Upper Triassic Xujiahe Formation in the Sichuan Basin. It was found that different types of pores and fractures are developed in the reservoirs, with the presence of favorable microfacies and diagenetic facies. Additionally, there are significant differences in the composition and carbon isotope characteristics of the natural gas in different intervals and gas fields, indicating localized enrichment.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Guangzhi Zhang, Rui Yang, You Zhou, Lin Li, Bingyi Du
Summary: This paper introduces a method to eliminate the influence of low-productivity fractures and extract the information of effective high-angle fractures in tight gas-bearing sand reservoirs. By implementing a Bayesian elastic impedance inversion workflow, the fracture orientation and intensity can be estimated. The proposed approach is demonstrated to be feasible and robust, and the predicted results agree well with log data and geological interpretation, highlighting its advantages in accurately predicting fracture characteristics.
JOURNAL OF APPLIED GEOPHYSICS
(2022)
Article
Energy & Fuels
Lin Jiang, Wen Zhao, Yang Fan, Feng Hong, Yanjie Gong, Jiaqing Hao
Summary: The study focused on natural gas migration and accumulation in tight formations, revealing two types of hydrocarbon carrier systems - micro-fractures and micro-coal lines. The research proposed that coal lines could also act as a hydrocarbon carrier system in tight sandstone formations. Numerical simulations showed that micro-fractures/micro-coal lines significantly enhance the permeability of sandstone, aiding in natural gas accumulation.
Article
Geosciences, Multidisciplinary
Bo Pan, Hongde Chen, Liangbiao Lin, Yu Yu, Dong Wu, Yixin Dong
Summary: The tight sandstones of the Xu2 member in the Western Sichuan Basin are becoming the main reservoir for natural gas exploration. The reservoir is characterized by low porosity, low permeability, and high displacement pressure due to complex diagenetic processes. Understanding diagenesis and its impact is crucial for reservoir exploration and development.
GEOLOGICAL JOURNAL
(2021)
Article
Geosciences, Multidisciplinary
Xiaoqi Wu, Quanyou Liu, Yingbin Chen, Jun Yang, Huasheng Zeng, Huaji Li
Summary: This study reveals the origin and characteristics of natural gas in the tight sandstone reservoirs of Member two of the Upper Triassic Xujiahe Formation in the Western Sichuan Depression through geochemical analysis and comparison.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Thermodynamics
Xiuping Zhong, Dongbin Pan, Ying Zhu, Yafei Wang, Guigang Tu, Shuaishuai Nie, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explored the productivity of depressurisation combined with thermal stimulation in a CH-Bk reservoir, identifying the challenges faced in the development of this mode and the potential benefits of adding a fracture network. The results showed that the fracture network significantly improved the productivity of D + Ti, making it a promising mode for CH-Bk development.
Article
Energy & Fuels
Chengyuan Xu, Xinglin Yang, Chuan Liu, Yili Kang, Yingrui Bai, Zhenjiang You
Summary: Dynamic fracture width prediction is crucial for lost circulation control in ultra-deep fractured reservoirs, but factors like connected fault boundary and nonlinear deformation behavior are often neglected. In this study, a prediction model based on non-Newtonian fluid dynamics theory is developed and validated with field data from Tarim Basin, China. Parametrical analysis shows the effects of pressure difference, consistency coefficient, flow pattern index, and fault boundary distance on dynamic fracture width. Control strategy for drilling fluid loss in fractures with connected fault is proposed.
Article
Energy & Fuels
Jie He, Xiangdong Guo, Hongjun Cui, Kaiyu Lei, Yanyun Lei, Lin Zhou, Qinghai Liu, Yushuang Zhu, Linyu Liu
Summary: The study shows that changes in gas viscosity and compressibility with pressure and temperature affect the results in the modified flowing material balance method. When allocating dynamic reserves, it has an important impact on the stable production period and initial decline rate.
Article
Geosciences, Multidisciplinary
Jiaxiang Xu, Lifeng Yang, Zhe Liu, Yunhong Ding, Rui Gao, Zhen Wang, Shaoyuan Mo
Summary: A novel approach was proposed to establish a three-dimensional geological model of induced fractures, natural fractures, and horizontal wells in the S oilfield. A coupled model calculating fluid flow in horizontal wellbore and reservoir fractures was calibrated by production data, showing the significant impact of fracture length and natural fracture intensity on productivity in the reservoir.
NATURAL RESOURCES RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Guoqi Wei, Ke Wang, Ronghu Zhang, Bo Wang, Chaofeng Yu
Summary: Structural diagenesis is an important factor controlling the reservoir characteristics of the Jurassic Ahe Formation in the Dibei gas reservoir. The paleo-tectonic stress affects the porosity reduction and structural fracture characteristics of the reservoir. Numerical simulation shows a positive correlation between the paleo-tectonic stress and reservoir physical properties and fracture characteristics. The direction and magnitude of the stress control the dominant striking direction and development degree of fractures. The central-southern part of the study area is a potential favorable area for high gas production.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Energy & Fuels
Yuan Rao, Zhengming Yang, Lijing Chang, Yapu Zhang, Zhenkai Wu, Haibo Li
Summary: The release of dissolved gas in gas-bearing tight oil reservoirs significantly affects development outcomes. By conducting high-pressure mercury intrusion experiments and resistance gradient tests on cores from various areas and lithologies, the study establishes a mathematical model to predict oil production and reveals the differences in porous flow resistance laws between different lithologies. The experimental results indicate that limestone reservoirs exhibit higher resistance gradients compared to sandstone reservoirs during the separation of dissolved gas, impacting oil production significantly.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2022)
Article
Energy & Fuels
Peng Yang, Likuan Zhang, Keyu Liu, Binfeng Cao, Jianlei Gao, Guiqiang Qiu
Summary: The second member of the Upper Triassic Xujiahe Formation in the western Sichuan Basin is targeted for tight gas exploration, with poor reservoir properties characterized by low porosity and permeability. The diagenetic evolution includes mechanical and chemical compaction, quartz overgrowths, cementation, dissolution of feldspar, and precipitation of various minerals. Sandstone lithofacies are defined based on texture, composition, diagenetic minerals, and pore types, with lithofacies I showing the best reservoir properties and potential as high-quality reservoir facies in tight sandstone reservoirs.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Chen Zhang, Deyu Zhu, Qun Luo, Luofu Liu, Dongdong Liu, Lin Yan, Yunzhao Zhang
JOURNAL OF ASIAN EARTH SCIENCES
(2017)
Article
Energy & Fuels
Hao Wu, Chunlin Zhang, Youliang Ji, Ruie Liu, Heng Wu, Yunzhao Zhang, Zhi Geng, Yilou Zhang, Jiaqi Yang
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2018)
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
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
Geosciences, Multidisciplinary
Yunzhao Zhang, Lianbo Zeng, Qun Luo, Rukai Zhu, Wenya Lyu, Dongdong Liu, Quanqi Dai, Shouxu Pan
Summary: Natural fractures, including tectonic fractures, diagenetic fractures, and overpressure-related fractures, play a crucial role in the migration, distribution, and accumulation of tight oil in the Permian Lucaogou Formation of the Junggar Basin. The different types of fractures serve as migration channels, storage spaces, and reservoir spaces for tight oil, with their density and aperture impacting the productivity of the reservoir.
JOURNAL OF EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Q. Q. Dai, G. W. Wang, C. J. Lu, Y. Z. Zhang, Z. L. Zhou, X. Q. Fan, S. Wang, Z. B. He
AUSTRALIAN JOURNAL OF EARTH SCIENCES
(2018)