Origin of over-pressure in clastic rocks in Yuanba area, northeast Sichuan Basin, China

Yang, Rui; He, Sheng; Li, Tianyi; Yang, Xiande; Hu, Qinhong

doi:10.1016/j.jngse.2016.01.043

Cited by 25 publications

(2 citation statements)

References 35 publications

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“…After the deposition of the Xujiahe Formation (T 3 x) in the Late Triassic, the Ziliujing Formation (J 1 z) and the Qianfoya Formation (J 2 q) developed successively in the Early Jurassic. The J 1 z can be further divided into four members from the bottom to the top: Zhenzhuchong (J 1 z 1 ), Dongyuemiao (J 1 z 2 ), Ma'anshan (J 1 z 3 ), and Da'anzhai Members (J 1 z 4 ) (Figure 1C) [32]. During the deposition of the J 1 z 4 in the Early Jurassic, the lake basin experienced a complete regression-transgression cycle.…”

Section: Geologic Backgroundmentioning

confidence: 99%

A New Method for Comprehensive and Quantitative Characterization of Shale Microfractures: A Case Study of the Lacustrine Shale in the Yuanba Area, Northern Sichuan Basin

Li,

et al. 2023

Energies

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Microfractures can connect isolated pores within shale, significantly increasing the shale’s storage capacity and permeability, and benefiting shale gas exploitation. Therefore, the quantitative characteristics of microfractures are important parameters for shale reservoir evaluation. In this paper, taking the Jurassic Da’anzhai Member (J1z4) lacustrine shale in the Yuanba area of the northern Sichuan Basin as an example, we propose a method for comprehensive and quantitative characterization of shale microfractures that combines rock thin section (RTS) and scanning electron microscopy (SEM) observations. The different magnifications of RTSs and SEM images lead to the identification and characterization of microfractures of different scales using these two methods. RTSs are mainly used to characterize microfractures with widths larger than 10 μm, while SEM is mainly used to characterize microfractures with widths smaller than 10 μm. These techniques can be combined to comprehensively and quantitatively characterize microfractures of different scales in shale. The microfracture characterization results show that the average total porosity of the J1z4 shale is 4.46%, and the average microfracture surface porosity is 1.20% in the Yuanba area. The calculated average percentage of microfracture porosity to total porosity is 21.09%, indicating that the J1z4 shale reservoir space is dominated by pores and has the conditions for stable shale gas production and potential for shale gas exploration. However, the percentage of microfracture porosity to total porosity of shale near faults and fold zones approaches or exceeds 50%, which may lead to the loss of shale gas. The new method proposed in this study is also useful for quantitative characterization of shale microfractures in the Sichuan Basin and other basins.

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Section: Geologic Backgroundmentioning

confidence: 99%

A New Method for Comprehensive and Quantitative Characterization of Shale Microfractures: A Case Study of the Lacustrine Shale in the Yuanba Area, Northern Sichuan Basin

Li,

et al. 2023

Energies

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show abstract

“…In recent years, extreme climate events have occurred frequently in the SWC. In 2006, the direct economic loss caused by heatwaves and drought in Sichuan and Chongqing exceeded 10 billion yuan [ 31 ]. In 2009–2010, the continuous drought in autumn, winter and spring in the SWC caused 9.65 million people to have difficulty in obtaining drinking water [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Variation characteristics of extreme climate events in Southwest China from 1961 to 2017

Wang,

Chen,

Zhang

et al. 2023

Heliyon

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Kerogen’s Potential to Be Converted into Petroleum: Reaction Kinetics and Modelling Thermal Maturity Plus Petroleum Transformation Processes

Hazra

Wood

Mani

et al. 2019

Evaluation of Shale Source Rocks and Reservoirs

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Origin of over-pressure in clastic rocks in Yuanba area, northeast Sichuan Basin, China

Cited by 25 publications

References 35 publications

A New Method for Comprehensive and Quantitative Characterization of Shale Microfractures: A Case Study of the Lacustrine Shale in the Yuanba Area, Northern Sichuan Basin

A New Method for Comprehensive and Quantitative Characterization of Shale Microfractures: A Case Study of the Lacustrine Shale in the Yuanba Area, Northern Sichuan Basin

Variation characteristics of extreme climate events in Southwest China from 1961 to 2017

Kerogen’s Potential to Be Converted into Petroleum: Reaction Kinetics and Modelling Thermal Maturity Plus Petroleum Transformation Processes

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