A novel hybrid method for gas hydrate filling modes identification via digital rock

Dong, Huaimin; Sun, Jing; Arif, Muhammad; Golsanami, Naser; Yan, Wei; Zhang, Yihuai

doi:10.1016/j.marpetgeo.2020.104255

Cited by 48 publications

(20 citation statements)

References 42 publications

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“…The most popular approach for calculating the above-mentioned three parameters is the box counting method, fundamentals of which are represented in the published reports [46,47]. Fractal geometry theory has been used for characterizing the pore structure of conventional and unconventional reservoir rocks [20,[50][51][52], as well as gas hydrate-bearing sediments in recent years [26,[52][53][54][55][56]. According to a fundamental study of Pfeifer and Avnir [57] and as reported in the later applica-tions [58,59], in a fractal structure, the number of elements N has got a power-law relationship with the element's length scale r as…”

Section: Typical Groups Of Clay Minerals In Hydrocarbonmentioning

confidence: 99%

Fractal Properties of Various Clay Minerals Obtained from SEM Images

et al. 2021

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Clay minerals significantly alter the pore size distribution (PSD) of the gas hydrate-bearing sediments and sandstone reservoir rock by adding an intense amount of micropores to the existing intragranular pore space. Therefore, in the present study, the internal pore space of various clay groups is investigated by manually segmenting Scanning Electron Microscopy (SEM) images. We focused on kaolinite, smectite, chlorite, and dissolution holes and characterized their specific pore space using fractal geometry theory and parameters such as pore count, pore size distribution, area, perimeter, circularity, and density. Herein, the fractal properties of different clay groups and dissolution holes were extracted using the box counting technique and were introduced for each group. It was observed that the presence of clays complicates the original PSD of the reservoir by adding about 1.31-61.30 pores/100 μm2 with sizes in the range of 0.003-87.69 μm2. Meanwhile, dissolution holes complicate the pore space by adding 4.88-8.17 extra pores/100 μm2 with sizes in the range of 0.06-119.75 μm2. The fractal dimension ( D ) and lacunarity ( L ) values of the clays’ internal pore structure fell in the ranges of 1.51-1.85 and 0.18-0.99, respectively. Likewise, D and L of the dissolution holes were in the ranges of, respectively, 1.63-1.65 and 0.56-0.62. The obtained results of the present study lay the foundation for developing improved fractal models of the reservoir properties which would help to better understand the fluid flow, irreducible fluid saturation, and capillary pressure. These issues are of significant importance for reservoir quality and calculating the accurate amount of producible oil and gas.

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Section: Typical Groups Of Clay Minerals In Hydrocarbonmentioning

confidence: 99%

Fractal Properties of Various Clay Minerals Obtained from SEM Images

et al. 2021

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“…Although the secondary pores can be formed under the influence of dissolution, it is inevitable that the pores become smaller and the porosity decreases. The study of pore evolution is the key problem to determine the tight time of the reservoir [19,20].…”

Section: Reservoir Pore Evolution and Compaction Historymentioning

confidence: 99%

Densification and Fracture Type of Desert in Tight Oil Reservoirs: A Case Study of the Fuyu Tight Oil Reservoir in the Sanzhao Depression, Songliao Basin

Zhang

De-jiang

et al. 2021

Lithosphere

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The exploration of unconventional oil and gas, especially the exploration process of tight oil, is closely related to the evolution of tight reservoirs and the accumulation process. In order to investigate the densification and accumulation process of the Fuyu tight oil reservoir in the Sanzhao depression, Songliao Basin, through the new understanding of reservoir petrological characteristics, diagenesis and diagenetic sequence are combined with a large number of inclusions: temperature measurement, spectral energy measurement, and single-well burial history analysis, and then contrastive analysis with current reservoir conditions. The results prove that diagenesis is dominated by compaction and cementation, and the restoration of paleoporosity shows that its porosity reduction rate reached 67% and the densification process started in the early Nenjiang Formation and was finalized at the end of the Nenjiang Formation. The accumulation of the Fuyu oil layer generally has the characteristics of two stages and multiple episodes, and the main accumulation period is the end of the Mingshui Formation. The end of the Nenjiang Formation, where the main body of the reservoir is densified, is just a prelude to the massive expulsion of hydrocarbons in the Songliao Basin, which makes the Fuyu oil layer have the characteristics of first compacting and then accumulating. Through the above analysis, it can be seen that the accumulation of oil and gas in the Fuyu oil layer, Sanzhao depression, is more dependent on the fault-dominated transport system. In addition, it is believed that tight oil accumulation should have the characteristics of short-distance oil enrichment around the fault, and the development area of fracture deserts near the fault sand body should be the key area for further exploration.

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“…The formation and stability of NGH in these environments require conditions of low temperature and high pressure conditions as illustrated in Fig. 2 Reagan et al, 2015;Dong et al, 2020;Dhakal and Gupta, 2021). When these settings are disturbed and depart out of the stable zone, the structure of NGH breaks and decomposes into water and gas (Koh et al, 2016;Dong et al, 2020;Dhakal and Gupta, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…2 Reagan et al, 2015;Dong et al, 2020;Dhakal and Gupta, 2021). When these settings are disturbed and depart out of the stable zone, the structure of NGH breaks and decomposes into water and gas (Koh et al, 2016;Dong et al, 2020;Dhakal and Gupta, 2021).…”

Section: Introductionmentioning

confidence: 99%

An assessment of methane gas production from natural gas hydrates: Challenges, technology and market outlook

Shaibu

Sambo

Guo

et al. 2021

Adv. Geo-Energy Res.

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Natural gas hydrates are enormous energy resources occurring in the permafrost and under deep ocean sediments. However, the commercial or sustained production of this resource with currently available technology remains a technical, environmental, and economic challenge, albeit a few production tests have been conducted to date. One of the major challenges has been sand production due to the unconsolidated nature of hydrate bearing formations. This review presents progress in methane gas production from natural gas hydrate deposits, specifically addressing the technology, field production and simulation tests, challenges, and the market outlook. Amongst the production techniques, the depressurization method of dissociating natural gas hydrates is widely accepted as the most feasible option and it has been used the most in field test trials and simulation studies. The market for natural gas hydrates looks promising considering the increasing demand for energy globally, limited availability of conventional fossil fuels, and the low carbon footprint when using natural gas compared to liquid and solid fossil fuels. The major market setback currently is cheap gas from shale and conventional oil and gas reservoirs.

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A novel hybrid method for gas hydrate filling modes identification via digital rock

Cited by 48 publications

References 42 publications

Fractal Properties of Various Clay Minerals Obtained from SEM Images

Fractal Properties of Various Clay Minerals Obtained from SEM Images

Densification and Fracture Type of Desert in Tight Oil Reservoirs: A Case Study of the Fuyu Tight Oil Reservoir in the Sanzhao Depression, Songliao Basin

An assessment of methane gas production from natural gas hydrates: Challenges, technology and market outlook

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