Impacts of mineralogy and pore throat structure on the movable fluid of tight sandstone gas reservoirs in coal measure strata: A case study of the Shanxi formation along the southeastern margin of the Ordos Basin

Dong, Xinxu; Meng, Xiangzhen; Pu, Renhai

doi:10.1016/j.petrol.2022.111257

Cited by 17 publications

(16 citation statements)

References 67 publications

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“…The research area is located in the eastern part of the Ordos Basin, from Shenmu in the north to Hancheng in the south and adjacent to Yulin-Yan’an in the west. It is tectonically located in the Jinxi fault belt of the Ordos Basin and the eastern part of the Yishan slope. , It has a monoclinal structure with gentle dips toward the NNE and NW directions, and the faults in the area are mainly NE-trending reverse faults, with fault spacings generally less than 50 m. Influenced by the sedimentary and tectonic evolution of the whole Ordos Basin, the upper Palaeozoic strata in the study area include , the Benxi Formation, Taiyuan and Shanxi Formations, Shihezi Formation, and Shiqianfeng Formation, from the bottom upward (Figure b). In the late Palaeozoic and early Carboniferous epochs, 150 million years of uplift and denudation ended in the North China block, the block began to settle overall, and the block received deposits. , The sedimentary thickness of the Benxi Formation in the Ordos Basin was mainly controlled by the palaeogeomorphology of the Ordovician weathering crust and is generally greater in the lower palaeogeomorphological depression .…”

Section: Experiments and Methodsmentioning

confidence: 99%

“…In the late Palaeozoic and early Carboniferous epochs, 150 million years of uplift and denudation ended in the North China block, the block began to settle overall, and the block received deposits. 41,42 The sedimentary thickness of the Benxi Formation in the Ordos Basin was mainly controlled by the palaeogeomorphology of the Ordovician weathering crust and is generally greater in the lower palaeogeomorphological depression. 25 Among them, the no.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Pore Structure and Multifractal Characteristics of Medium- and High-Rank Coals Based on the Gas Adsorption Method: A Case Study of the Benxi Formation in the Eastern Margin of the Ordos Basin

Wang,

Deng,

et al. 2024

Energy Fuels

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Nanopore heterogeneity significantly affects the adsorption, desorption, and diffusion processes of coalbed methane.Here, the medium-and high-rank coals of the Benxi Formation in the eastern margin of the Ordos Basin were taken as the research object, and low-pressure CO 2 adsorption and low-temperature N 2 adsorption experiments were used to study the pore characteristics; combined with multifractal theory, the multifractal characteristics of micropores (0.3−2.0 nm) and meso-/macropores (2−300 nm) in MRC and HRC are characterized and explored, and the evolutionary trends and influential factors during metamorphism are explored. The results show that the pore distribution of micropores and meso-/macropores in MRC to HRC coal has multifractal characteristics. Compared with meso-/macropores, micropores exhibit smaller Δα values and larger H values; that is, micropores have weaker heterogeneity and better pore connectivity. As the coal rank increases, the percentage of the micropore volume in the coal increases, and the pore size distribution of micropores and meso-/macropores tends to be more homogeneous, which leads to a decrease in the pore structure uniformity and improvement in the pore connectivity in coal reservoirs. An increase in the vitrinite content leads to better connectivity and a more uniform pore structure of micropores and meso-/macropores. An increase in the mineral content and A d leads to a decrease in the connectivity of micropores and meso-/macropores and tends to increase the complexity of pore structures. With increasing micropore volume and specific surface area, the degree of pore aggregation and heterogeneity decreases, and the pore connectivity increases. However, there is no significant correlation between the pore structure and the multifractal parameters of the meso-/macropore structure. The HRC samples have more micropores than the MRC samples and thus exhibit greater pore structure homogeneity and better pore connectivity. A uniform distribution and good connectivity of the pores help to improve the methane adsorption capacity.

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Section: Experiments and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Pore Structure and Multifractal Characteristics of Medium- and High-Rank Coals Based on the Gas Adsorption Method: A Case Study of the Benxi Formation in the Eastern Margin of the Ordos Basin

Wang,

Deng,

et al. 2024

Energy Fuels

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“…13 The sorting coefficient reflects the concentration degree of the pore-throat size distribution and is an indicator to describe the heterogeneity. 29 The movable fluid parameters, which include movable fluid saturation (MFS) and movable fluid porosity (MFP), serve as indicators of fluid mobility within the formation and are closely linked to the degree of pore-throat connectivity and seepage capacity. Figure 10 plotted the curves of the NMR movable fluid parameters versus the HPMI sorting coefficients, which presented an apparent linear tendency of negative correlation.…”

Section: Effect Of the Pore Throatmentioning

confidence: 99%

“…Figure 10 plotted the curves of the NMR movable fluid parameters versus the HPMI sorting coefficients, which presented an apparent linear tendency of negative correlation. 20,29 The lower the sorting coefficient, the more concentrated the PSD, the weaker the heterogeneity of the rock, and the stronger the fluid flowability. 29 Simultaneously, the lower the sorting coefficient reflects the lesser differentiation between the pore and the throat, and the pore/throat ratio becomes smaller.…”

Section: Effect Of the Pore Throatmentioning

confidence: 99%

“…20,29 The lower the sorting coefficient, the more concentrated the PSD, the weaker the heterogeneity of the rock, and the stronger the fluid flowability. 29 Simultaneously, the lower the sorting coefficient reflects the lesser differentiation between the pore and the throat, and the pore/throat ratio becomes smaller. This also significantly decreases the likelihood of snap-off and the Jamin effect as well as their impact on gas phase seepage.…”

Section: Effect Of the Pore Throatmentioning

confidence: 99%

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Effect of Pore-Throat Heterogeneity on Gas–Water Flow in Tight Gas Reservoirs: From Micro- to Centimeter Scale

Wang,

Kang,

You

et al. 2024

Energy Fuels

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The practice of gas reservoir development shows that tight sandstone gas wells show an ultralow water flowback rate, even if the displacement differential pressure is continuously increased. Scholars have studied the influence of physical properties, pore structure, and fluid properties on flowback efficiency, but the influence of heterogeneity on water phase flowback is still not sufficient, especially comprehensive research across different scales. To deal with this, we investigate the effect of heterogeneity on fluid flow capability through centimeter core-scale experiments and micrometer pore-scale simulations. First, on the basis of the bounds of different pore-throat structure testing methods, the full-scale pore size distribution (PSD) and throat size distribution (TSD) structures are characterized by splicing. Next, we extract the high-pressure mercury injection (HPMI) sorting coefficient and the pixel variation coefficient of pore segmentation in scanning electron microscopy (SEM) images as the characterization parameters of heterogeneity. Direct experimental evidence shows that the stronger the rock heterogeneity, the larger the sorting coefficient and variation coefficient and the weaker the fluid mobility. It is difficult to improve the gas phase seepage ability even with a continuously increasing displacement pressure differential. Finally, we explored whether the reason for this phenomenon is mainly controlled by heterogeneity. We carried out microfluidic simulations, and the simulation results provide a good complementary explanation for this phenomenon. The preferential flow pathway effect induced by strong heterogeneity makes it impossible to affect the fluid flow state by only changing the displacement pressure differential, and it is difficult for the displacement phase to establish a new flow channel. The findings at different scales provide unique insights into the combined effects of pore heterogeneity and displacement pressure differentials on fluid flow.

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Evolutionary Response Model of Low Maturity Coal Measure Reservoir Space to Temperature-Water Pressure Under Hydrous Pyrolysis

Xiang

Fu²,

Tian

2023

Chem Technol Fuels Oils

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Impacts of mineralogy and pore throat structure on the movable fluid of tight sandstone gas reservoirs in coal measure strata: A case study of the Shanxi formation along the southeastern margin of the Ordos Basin

Cited by 17 publications

References 67 publications

Study on the Pore Structure and Multifractal Characteristics of Medium- and High-Rank Coals Based on the Gas Adsorption Method: A Case Study of the Benxi Formation in the Eastern Margin of the Ordos Basin

Study on the Pore Structure and Multifractal Characteristics of Medium- and High-Rank Coals Based on the Gas Adsorption Method: A Case Study of the Benxi Formation in the Eastern Margin of the Ordos Basin

Effect of Pore-Throat Heterogeneity on Gas–Water Flow in Tight Gas Reservoirs: From Micro- to Centimeter Scale

Evolutionary Response Model of Low Maturity Coal Measure Reservoir Space to Temperature-Water Pressure Under Hydrous Pyrolysis

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