Investigation of the artificial fracture conductivity of volcanic rocks from Permian igneous in the Sichuan Basin, China, with different stimulation method using an experiment approach

Luo, Zhifeng; Chen, Xiang; Zhang, Nanlin; Zeng, Xiuquan; Zhao, Maoru

doi:10.1016/j.jngse.2021.104234

Cited by 17 publications

(9 citation statements)

References 22 publications

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“…40 Generally, a higher Young's modulus and a lower Poisson's ratio indicate the stronger brittleness of the rock, and it is easier to form complex fractures during fracturing. 36,37 The brittleness is calculated from Poisson's ratio and Young's modulus using the following equations: E v (5) where BI is the brittleness index, %; E is Young's modulus of the rock, GPa; ν is Poisson's ratio of the rock, dimensionless; and the subscripts min and max represent the minimum and maximum values, respectively. BI E and BI ν are the brittleness index calculated by Young's modulus and Poisson's ratio, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…With the advancement of petroleum exploration technology and the continuous discovery of igneous rock oil and gas reservoirs, igneous rock oil and gas reservoirs have attracted the attention of scholars as a new field of oil and gas exploration and development. − Like sedimentary rock oil and gas reservoirs, igneous rock oil and gas reservoirs are widely distributed in more than 300 basins or blocks in more than 20 countries on 5 continents. They have been found in many countries including Russia, China, the United States, and Japan .…”

Section: Introductionmentioning

confidence: 99%

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Study on the Effect of Fracturing Fluid on the Structure and Mechanical Properties of Igneous Rock

et al. 2022

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Igneous rock oil and gas reservoirs have great development potential. Hydraulic fracturing is an important means for the development of these reservoirs. In the process of fracturing and increasing production, fracturing fluid is prone to a hydration reaction with clay minerals in igneous rock, and then, the structure and mechanical properties of the igneous rock are changed, affecting increased production. Therefore, it is necessary to establish a systematic water–rock reaction experiment method to understand the influence of fracturing fluid on the structure and mechanical properties of igneous rocks and to optimize the fracturing fluid system of igneous rock reservoirs. In this experiment, four solutions were used: slickwater, guar fracturing fluid, 2% KCl aqueous solution, and 4% KCl aqueous solution. Acoustic testing, porosity and permeability testing, XRD analysis, micro-CT scanning, and displacement experiments were performed. The influence of different fracturing fluids on the structure and mechanical properties of igneous rocks was studied. Igneous rock samples with a permeability of 0.05–0.1 mD and average porosity of 7–14% were used. The results show that all four liquid systems will reduce the permeability, Young’s modulus, and brittleness index and increase the porosity and Poisson’s ratio of the rock after fracturing. Among them, the permeability damage rate is as high as 37.37%, which may be related to the plugging of pores with solid residues in the gel breaking liquid; CT results show that there are microcracks in the rock, which increase over time, up to 13.54%. The brittleness index decreases. Among the fluids, the influence of slickwater on the rock brittleness index is the smallest, no more than 5%. Guar gum had the greatest effect on the Gel breaking liquid, up to 58%. One of the reasons for the increase in porosity is that adding a clay stabilizer composed of inorganic salts and organic cationic polymers to the slickwater fracturing fluid can effectively reduce the damage caused by the fracturing fluid to the rock during the fracturing process and can reduce the maximum by 50%. This paper can clarify the damage law of fracturing fluid systems to igneous rock reservoirs and provide the theoretical basis for the hydraulic fracturing of igneous rock reservoirs.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Fracturing Fluid on the Structure and Mechanical Properties of Igneous Rock

et al. 2022

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“…Volcanic reservoirs have been explored for more than a century, and discovered in more than 300 basins worldwide. Industrial oil and gas flows and large-scale reserves were formed from volcanic rocks in 40 basins in 13 countries (Zou et al, 2008;Zhao et al, 2009;Tang et al, 2020;Zhang et al, 2021;Ye et al, 2022). In recent years, volcanic reservoirs containing large-scale oil and gas reserves have also been discovered in volcanic rock formations in many sedimentary basins in China, proving that volcanic rock reservoirs have good hydrocarbon potential (Feng 2008;Zou et al, 2008;Feng et al, 2014;Chang et al, 2019;Ye et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Geochemical characteristics and origin of crude oil from Carboniferous volcanic rocks in the Hongche Fault Zone of the Junggar Basin of China

Chen

Wang

et al. 2022

Front. Earth Sci.

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In recent years, significant advances have been made in the exploration of Carboniferous volcanic reservoirs in the Hongche Fault Zone of the Junggar Basin of China, showing good prospects for further exploration. However, the large variation in the physical properties of crude oil and the complex distribution rule inhibit the one-step exploration. In this study, the PM scale of the biodegradation of crude oil and source of crude oil were studied using experimental methods that target the properties, bulk properties and biomarker compounds of crude oil. The exploration potential of crude oil in this area was analysed, and an accumulation model of crude oil was established. Based on the differences in biomarker compounds and the degree of biodegradation, crude oils were divided into four groups and seven subgroups. Additionally, the analysis of the biomarker compounds of crude oil combined with the hydrocarbon-generation history of source rocks showed that there were at least two periods of oil charging in this area. The first period was the late Triassic, with crude oil derived from the P1f source rock. Owing to the strong tectonic activity during the late Indosinian movement, the oil reservoirs were distributed in the footwall of the fault zone, and the oil in the reservoir exhibited different degrees of biodegradation, forming crude oils of subgroup I1, II and III1. The second period was Cretaceous, during which the P1f source rock was in the natural gas generation stage, and the P2w source rock was at a mature stage. A small part of the crude oil formed by the P2w source rock migrated to the Carboniferous reservoirs and mixed with the crude oil formed by the earlier P1f source rock, resulting in crude oils of subgroups I2, III2, and IV2. The crude oil in the studied area originated from the source rocks in the sag during the peak of oil generation. As tectonic activity approached stability in the latter period, it is speculated that there may be well-preserved primary oil and gas reservoirs in the footwall and slope areas of the fault, making these potential exploration sites.

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“…China has directed the petroleum exploration to deep-layer unconventional oil and gas reservoirs to meet the increasing demand for energy. − In recent years, several largely deep-layer oil and gas reservoirs have been discovered in Western China, among which Xinjiang Oilfield Company achieved exploration breakthrough in the Nanyuan, Mahu, and Shawan districts of Junggar Basin and commercially developed deep-layer tight reservoirs. − …”

Section: Introductionmentioning

confidence: 99%

Pressure Transient Analysis for Hydraulically Fractured Wells with Changing Conductivity in Stratified Reservoirs: Case Study in Xinjiang Oilfield

Li¹,

Zhang

Xia³

et al. 2022

ACS Omega

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The oil development has been oriented toward deep-layer reservoirs and the commingling production and the separate-layer fracturing are important development methods. Currently, limited attention is given to the pressure transient analysis (PTA) of the fractured wells located in a stratified reservoir. Moreover, the proppant is very difficult to move inside the hydraulic fracture in the deep-layer reservoir, leading to the uneven fracture conductivity along the hydraulic fracture and increasing the complexity of PTA. To fill this gap, this work presented a fully analytical well test model for hydraulically fractured wells with changing fracture conductivity in stratified reservoirs, which is convenient to be used for interpreting the recorded pressure data from the oilfield due to its analytical nature. The establishment of this model is based on the trilinear flow model, Duhamel theorem, and pressure superposition principle. A systematic verification is conducted to ensure the validity of the proposed model. Furthermore, we offer a sensitivity analysis to investigate the effect of crucial parameters on pressure and pressure derivative, including the fracture extension, fracture conductivity, transmissibility factor, and storativity factor. Finally, a field case of a four-layer fractured well from Xinjiang Oilfield in Junggar Basin is interpreted to demonstrate the practicability of the presented model.

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Investigation of the artificial fracture conductivity of volcanic rocks from Permian igneous in the Sichuan Basin, China, with different stimulation method using an experiment approach

Cited by 17 publications

References 22 publications

Study on the Effect of Fracturing Fluid on the Structure and Mechanical Properties of Igneous Rock

Study on the Effect of Fracturing Fluid on the Structure and Mechanical Properties of Igneous Rock

Geochemical characteristics and origin of crude oil from Carboniferous volcanic rocks in the Hongche Fault Zone of the Junggar Basin of China

Pressure Transient Analysis for Hydraulically Fractured Wells with Changing Conductivity in Stratified Reservoirs: Case Study in Xinjiang Oilfield

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