Effects of different types of fractures on shale gas preservation in Lower Cambrian shale of northern Sichuan Basin: Evidence from macro-fracture characteristics and microchemical analysis

Tian, He; Zeng, Lianbo; Ma, Shijie; Li, Hong; Mao, Zhe; Peng, Yongmin; Xiang, Xu; Feng, Dongjun

doi:10.1016/j.petrol.2022.110973

Cited by 9 publications

(2 citation statements)

References 40 publications

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“…Natural fractures act as an important reservoir space in the reservoir, but also provide more channels for artificial fracturing. However, fractures, as fluid flow channels, increase the permeability of shale reservoirs, but may also destroy the preservation conditions of shale gas, resulting in a partial outflow of natural gas, thus reducing the storage of shale gas [12,34,35].…”

Section: Fracture Characteristicsmentioning

confidence: 99%

Reservoir Characteristics and Exploration Potential Evaluation of Lower Cambrian Niutitang Shale in Northern Guizhou: A Case Study of Well QX1

Yang,

Zou,

Zhang

et al. 2024

Energies

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The Lower Cambrian Niutitang Formation in the Northern Guizhou harbors abundant organic-rich mud shale, constituting the most significant marine shale gas reservoir in Guizhou. In this article, the reservoir characteristics of Lower Cambrian Niutitang Formation in Northern Guizhou are analyzed in terms of lithology, mineralogy, organic geochemistry, pore structure, gas content and continuous thickness of shale, and the exploration potential of shale gas in this area is evaluated. The results indicate that the content of brittle minerals in the shale of well QX1 is 65.29% to 95.22% (average of 82.10%). The total organic carbon (TOC) content ranges from 2.06% to 12.10% (average of 5.64%). The organic matter maturity (Ro) within the range of 2.29–2.67%, and the kerogen type is identified as type I. The shale samples from the Niutitang Formation have high TOC content, suitable thermal maturity, and a favorable kerogen type, suggesting good gas generation potential. The results of scanning electron microscopy (SEM) show that intergranular pores, intragranular pores and microfractures are developed in the shale of well QX1, which can provide sufficient storage space for shale gas. The shale exhibits a continuous thickness of 105.66 m in the QX1 well, comprising a gas-bearing interval of 32.89 m at the top (with an effective continuous thickness of 18 m) and a hydrocarbon source rock layer of 75.78 m at the bottom. In comparison with other shale gas regions, Niutitang Formation shale in Northern Guizhou exhibits characteristics such as favorable gas generation conditions, greater storage conditions, excellent gas-bearing, strong frackability, and substantial continuous thickness, it has greater potential for shale gas exploration.

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Section: Fracture Characteristicsmentioning

confidence: 99%

Reservoir Characteristics and Exploration Potential Evaluation of Lower Cambrian Niutitang Shale in Northern Guizhou: A Case Study of Well QX1

Yang,

Zou,

Zhang

et al. 2024

Energies

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“…As a clean energy source and unconventional oil and gas resource, shale gas has been successfully developed through hydraulic fracturing. 1,2 During the fracturing process, the operator needs to inject thousands of tons of fracturing fluid into the reservoir, while the surface high-pressure pipeline connected between the pump and the wellbore carries fracturing fluid containing proppant and debris generated from rock breaking. 3 The pipeline is subjected to repeated fluctuations in internal pressure (up to 140 MPa) and the impact of solid particles encased in a highly concentrated fluid moving at high speeds.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of erosion behavior under fluctuating tensile loads

Dai,

Fan,

Yang

2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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When studying the erosion behavior of fracturing pipelines, it is inevitable to consider the exacerbating effect of fluctuating internal pressure on pipeline erosion damage. Therefore, an erosion experimental apparatus capable of applying fluctuating tensile loads to specimens was developed to investigate the erosion rate of 35CrMo steel at different average tensile stresses (0–500 MPa), impact angles (15–90°), flow velocity (7.5–20 m/s), and experimental times (10–60 min), and to analyze the erosion damage mechanism under fluctuating loads by observing the microstructure within the erosion scars using scanning electron microscope. The results indicated that erosion rate increased up to 36.84% compared to that without loading under the same erosion condition. Erosion rate increased up to 822.00% when velocity increased from minimum to maximum. Under fluctuating loads, the deepest part of the erosion scar cracked first and the specimen eventually fractured completely along with its entire width, demonstrating that the newly established experimental conditions can well reproduce the sudden bursting phenomenon common to high-pressure pipelines that erode under harsh conditions. The fracture of the specimen shows laminar structure, which is a typical damage feature resulting from the combined effect of a great number of tensile stress cycles and erosion wear.

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Multi-component induction logging detection characteristics of the fracture azimuth and dip angles and the fast extraction methods of fracture distribution parameters

Zeyu

Tan

Wang

et al. 2023

Geoenergy Science and Engineering

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Effects of different types of fractures on shale gas preservation in Lower Cambrian shale of northern Sichuan Basin: Evidence from macro-fracture characteristics and microchemical analysis

Cited by 9 publications

References 40 publications

Reservoir Characteristics and Exploration Potential Evaluation of Lower Cambrian Niutitang Shale in Northern Guizhou: A Case Study of Well QX1

Reservoir Characteristics and Exploration Potential Evaluation of Lower Cambrian Niutitang Shale in Northern Guizhou: A Case Study of Well QX1

Experimental study of erosion behavior under fluctuating tensile loads

Multi-component induction logging detection characteristics of the fracture azimuth and dip angles and the fast extraction methods of fracture distribution parameters

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