Article
Energy & Fuels
Yuan Jin, Liang Xiao, Wei Li, Guanqun Wang, Wei Long
Summary: In recent years, nuclear magnetic resonance (NMR) logging has been widely used to characterize rock properties. However, accurately interpreting these properties from NMR data can be challenging. This study used a random walk technique to simulate NMR responses of sandstones and conducted a sensitivity analysis under different conditions. The results showed that salinity and viscosity have an impact on the NMR measurements, while water saturation affects the T-2 spectrum. The method provides a basis for interpreting NMR responses and identifying fluids in reservoirs.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2023)
Article
Energy & Fuels
Ya-Hao Huang, You-Jun Tang, Mei-Jun Li, Hai-Tao Hong, Chang-Jiang Wu, Ji-Zhen Zhang, Xiao-Lin Lu, Xiao-Yong Yang
Summary: This study investigates the fluid accumulation mechanisms and reservoir properties preservation and degradation indicators in a tight gas reservoir. Different types of gas inclusions in quartz grains were studied to understand the evolution of fluid phases. Two stages of CO2 fluid accumulation were observed, with abnormally high homogenization temperatures attributed to deep hydrothermal fluid activity.
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
Energy & Fuels
Guangfeng Liu, Shuaiting Xie, Wei Tian, Juntao Wang, Siying Li, Yixuan Wang, Daoyong Yang
Summary: In this study, the effect of pore-throat structure on gas-water seepage behavior in a tight gas sandstone formation was experimentally examined. The study found that deteriorated pore-throat structure leads to weakened permeability of gas and water, along with more severe water locking. This research provides a better understanding of how pore-throat structure influences gas-water seepage behavior in tight gas reservoirs.
Article
Geosciences, Multidisciplinary
Guangfeng Liu, Yifeng Wang, Hang Yin, Yaping Ding, Yifei Lan, Daoyong Yang
Summary: A pragmatic technique was developed to experimentally determine gas-water seepage characteristics, considering dynamic pore-throat structure. The impact of dynamic pore-throat structure on gas-water micro-distribution and percolation capacity is most significant at the initial stage.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Energy & Fuels
Lili Sun, Xining Hao, Hongen Dou, Caspar Daniel Adenutsi, Wenli Liu
Summary: This study proposes a new method to solve the problem of low accuracy in permeability prediction in tight sandstone reservoirs. By introducing two new parameters, the relationships between permeability and these parameters are established, and a new permeability prediction model is proposed. The effectiveness of the method is verified by comparing with existing models and field measurement data.
INTERNATIONAL JOURNAL OF OIL GAS AND COAL TECHNOLOGY
(2022)
Article
Energy & Fuels
Hooman Afsar, Fereshteh Samadi, Feridun Esmaeilzadeh, Abolhasan Ameri
Summary: This study investigates the matrix acidizing of sandstone wells using a hydrochloric acid/hydrofluoric acid/additives mixture through mathematical modeling. The non-Newtonian behavior of the acid solution in porous media was studied, and it was concluded that acid with high shear-thinning behavior is more promising for field operations due to deep penetration. The model developed in this study can reproduce different types of acid/rock systems and calculate the skin factor to study acidizing performance in the damaged zone.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Xian Shi, Caiyun Xiao, Hongjian Ni, Qi Gao, Lei Han, Dianshi Xiao, Shu Jiang
Summary: In order to apply supercritical carbon dioxide (ScCO2) fracturing on tight sandstone properly, the effects of ScCO2 on pore structure were investigated. ScCO2 treatment was applied to three sets of tight sandstone samples, and the pore structure was characterized using high-pressure mercury intrusion porosimetry and nuclear magnetic resonance. The results showed that after SCCO2 treatment, the number of transitional pores decreased significantly, while the number of mesopores and macropores increased. The fractal dimension characteristics indicated that the pore structure became more complicated and heterogeneous, and large pores had a higher fractal dimension than small pores. The content of calcite sharply decreased while clay, feldspar, and plagioclase content had a slight drop after ScCO2 treatment, affecting the alternation of pore structure. Thus, the accumulative pore volume and pore connectivity do not always increase after ScCO2 exposure due to potential pore and channel clogging from re-precipitation and fine migration.
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
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
Energy & Fuels
Yongqiang Xu, Linyu Liu, Yushuang Zhu
Summary: By analyzing the occurrence characteristics of movable fluids in tight sandstone reservoirs using nuclear magnetic resonance and microscopic experiments, it was found that movable fluids are mainly distributed in medium and large pores, and the size of throats and connectivity of pore-throat have significant effects on fluid saturation.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Energy & Fuels
Zhihao Jiang, Gaoren Li, Peiqiang Zhao, You Zhou, Zhiqiang Mao, Zhidi Liu
Summary: Wettability is crucial for understanding the seepage characteristics of tight sandstone reservoirs. This study investigates the spontaneous imbibition and displacement behaviors of mixed-wet tight sandstone reservoirs using high precision balance and nuclear magnetic resonance (NMR) T2 experiment. The results reveal different types of pores with different wettability and provide a novel wettability evaluation method for mixed-wet tight sandstone.
Article
Geosciences, Multidisciplinary
Ziyi Wang, Nengwu Zhou, Shuangfang Lu, Yancheng Liu, Liming Lin, Yang Liu, Bo Song
Summary: This study investigates the generation, accumulation, and distribution of tight sandstone gas in the Linxing-Shenfu gas fields in the northeastern margin of the Ordos Basin. It utilizes various approaches and data analysis to characterize different types of reservoirs and their formation mechanisms.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Pu Wang, Yi-an Cui, Jianxin Liu
Summary: Fluid discrimination is challenging for reservoir prediction, especially for tight sandstones. This paper reviews the effective medium models and inversion methods used in seismic exploration and proposes a new inclusion-based rock physics model for tight sandstones. A detailed prediction process for fluid discrimination is given and the effectiveness of the proposed method is demonstrated through field data applications.
SURVEYS IN GEOPHYSICS
(2022)
Article
Geochemistry & Geophysics
Yongchao Xue, Qingshuang Jin, Hua Tian
Summary: This paper focuses on a typical tight sandstone gas reservoir in Changqing Oilfield, revealing a strong stress sensitivity and impact of start-up pressure gradient on gas well productivity.
Article
Physics, Atomic, Molecular & Chemical
Jiangfeng Guo, Ranhong Xie, Huanhuan Liu
APPLIED MAGNETIC RESONANCE
(2019)
Article
Geochemistry & Geophysics
Mi Liu, Ranhong Xie, Changxi Li, Xia Li, Guowen Jin, Jiangfeng Guo
JOURNAL OF GEOPHYSICS AND ENGINEERING
(2018)
Article
Physics, Atomic, Molecular & Chemical
Jiangfeng Guo, Ranhong Xie
APPLIED MAGNETIC RESONANCE
(2019)
Article
Geochemistry & Geophysics
Jiangfeng Guo, Ranhong Xie, Guowen Jin
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2019)
Article
Biochemical Research Methods
Jiangfeng Guo, Ranhong Xie, Lizhi Xiao, Guowen Jin, Lun Gao
JOURNAL OF MAGNETIC RESONANCE
(2019)
Article
Energy & Fuels
Jiangfeng Guo, Ranhong Xie, Lizhi Xiao, Mi Liu, Lun Gao
Article
Geochemistry & Geophysics
Guowen Jin, Ranhong Xie, Mi Liu, Jiangfeng Guo
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2019)
Article
Energy & Fuels
Guowen Jin, Ranhong Xie, Mi Liu, Jiangfeng Guo, Lun Gao
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2019)
Article
Geochemistry & Geophysics
Guowen Jin, Ranhong Xie, Lizhi Xiao
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Energy & Fuels
Jiangfeng Guo, Ranhong Xie, Lizhi Xiao
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2020)
Article
Geochemistry & Geophysics
Lun Gao, Ranhong Xie, Jiangfeng Guo, Guowen Jin, Mingxuan Gu, Bohan Wu
Summary: A gray-scale morphology filter method based on morphological difference has been developed to improve the signal-to-noise ratio of NMR echo data, yielding the best results at low S/Ns and having the shortest run time.
Article
Energy & Fuels
Bohan Wu, Ranhong Xie, Xiaoyu Wang, Tangyu Wang, Wenzheng Yue
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2020)
Article
Energy & Fuels
Guowen Jin, Ranhong Xie, Lizhi Xiao, Bohan Wu, Chenyu Xu, Xiaoyu Wang, Tangyu Wang
Summary: This study proposes a method based on nuclear magnetic resonance (NMR) measurements for the continuous and quantitative characterization of bound and movable fluid microdistribution in porous rocks. The effectiveness of the method was verified through experiments and field applications, providing practical guidance for the exploration and development of oil and gas resources.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Bohan Wu, Ranhong Xie, Chenyu Xu, Hongyuan Wei, Shuai Wang, Jilong Liu
Summary: A new method for predicting the MICP curves of sandstone based on NMR echo data is proposed in this paper, which calculates multiple characteristic parameters and establishes a relationship between the parameters and mercury saturation, showing high prediction accuracy and stability. A reservoir classification index based on MICP curve parameters and physical parameters is created to provide accurate classification of sandstone reservoirs.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Mingxuan Gu, Ranhong Xie, Lizhi Xiao
Summary: This paper proposes a denoising method based on DCT, which is validated and compared through numerical simulations to determine the optimum choice of using variable length windows for denoising NMR data. Experimental results confirm the effectiveness of the denoising method in reducing noise in actual NMR data.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)