Evaluation on the effectiveness of natural fractures in Changxing Fm reef-flat facies reservoirs, Yuanba area, Sichuan Basin

Zhao, Xiangyuan; Hu, Xiangyang; Zeng, Lianbo; Kaihua, Xiao; Li, Hongtao; You, Yuchun; Feng, Qinglai

doi:10.1016/j.ngib.2017.08.006

Cited by 4 publications

(1 citation statement)

References 4 publications

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“…Effective fracture ratio directly affects the production performance of oil and gas reservoirs, so it is an important index for evaluating oil and gas reservoirs. To date, the studies of fracture Edited by Yan-Hua Sun effectiveness are mostly based on qualitative analysis of well logging information (Tang et al 2017), fracture genesis, and influential factors (An et al 2016), while quantitative evaluation of fracture effectiveness is rare (Zhao et al 2017). Therefore, this paper proposes a digital core approach to study heterogeneous seepage characteristics of tight sandstones by incorporating micro-CT scanning results into a numerical fluid flow model.…”

Section: Introductionmentioning

confidence: 99%

Investigating microscopic seepage characteristics and fracture effectiveness of tight sandstones: a digital core approach

Song

et al. 2020

Pet. Sci.

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Microscopic seepage characteristics are critical for the evaluation of tight sandstone reservoirs. In this study, a digital core approach integrating microscopic seepage simulation and CT scanning was developed to characterize microscopic seepage and fracture effectiveness (the ratio of micro-fractures that contributes to fluid flow) of tight sandstones. Numerical simulations were carried out for characterizations of tight sandstones. The results show that the axial permeability of the investigated cylindrical tight sandstone from Junggar Basin in China is 0.460 μm2, while the radial permeability is 0.3723 μm2, and the axial and radial effective fracture ratios are 0.4387 and 0.4806, respectively, indicating that cracks are not fully developed and the connectivity between micro-cracks is poor. Directional permeability that is difficult to measure by laboratory experiments can be obtained readily using the proposed method in this paper. The results provide important information for improving the exploration and development of tight sandstone reservoirs.

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Section: Introductionmentioning

confidence: 99%

Investigating microscopic seepage characteristics and fracture effectiveness of tight sandstones: a digital core approach

Song

et al. 2020

Pet. Sci.

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Natural fractures in tight gas sandstones: a case study of the Upper Triassic Xujiahe Formation in Xinchang gas field, Western Sichuan Basin, China

et al. 2021

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The Upper Triassic Xujiahe Formation is a typical tight gas reservoir in which natural fractures determine the migration, accumulation and production capacity of tight gas. In this study, we focused on the influences of natural fractures on the tight gas migration and production. We clarified characteristics and attributes (i.e. dips, apertures, filling degree and cross-cutting relationships) of the fractures based on image logging interpretations and core descriptions. Previous studies of electron spin resonance, carbon and oxygen isotopes, homogenization temperature of fluid inclusions analysis and basin simulation were considered. This study also analysed the fracture sequences, source of fracture fillings, diagenetic sequences and tight gas enrichment stages. We obtained insight into the relationship between fracture evolution and hydrocarbon charging, particularly the effect of the apertures and intensity of natural fractures on tight gas production. We reveal that the bedding fractures are short horizontal migration channels of tight gas. The tectonic fractures with middle, high and nearly vertical angles are beneficial to tight gas vertical migration. The apertures of fractures are controlled by the direction of maximum principal stress and fracture angle. The initial gas production of the vertical wells presents a positive correlation with the fracture abundance, and the intensity and aperture of fractures are the fundamental factors that determine the tight gas production. With these findings, this study is expected to guide the future exploration and development of tight gas with similar geological backgrounds.

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Intelligent prediction of fracture parameters in ultra-deep carbonate rocks based on knowledge and data dual drive

Wan¹,

Wang

Liu

et al. 2022

Petroleum Science and Technology

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Evaluation on the effectiveness of natural fractures in Changxing Fm reef-flat facies reservoirs, Yuanba area, Sichuan Basin

Cited by 4 publications

References 4 publications

Investigating microscopic seepage characteristics and fracture effectiveness of tight sandstones: a digital core approach

Investigating microscopic seepage characteristics and fracture effectiveness of tight sandstones: a digital core approach

Natural fractures in tight gas sandstones: a case study of the Upper Triassic Xujiahe Formation in Xinchang gas field, Western Sichuan Basin, China

Intelligent prediction of fracture parameters in ultra-deep carbonate rocks based on knowledge and data dual drive

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