Diagenetic sequences of continuously deposited tight sandstones in various environments: A case study from upper Paleozoic sandstones in the Linxing area, eastern Ordos basin, China

Li, Yong; Gao, Xiangdong; Meng, Shangzhi; Wu, Peng; Niu, Xinlei; Qiao, Peng; Elsworth, D.

doi:10.1306/03061918062

Cited by 61 publications

(56 citation statements)

References 75 publications

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“…Shale pore structure is affected by the sediments’ depositional environment, burial depth, depth‐related pressure, temperature conditions, compaction, cementation, OM, and mineral composition 13,20,26,31,74 . In this study, we focused on the typical marine‐continental transitional shale belonging to the Longtan Formation.…”

Section: Discussionmentioning

confidence: 99%

“…Since the theory of diagenesis was put forward, 27 a lot of studies have been carried out on sandstone and marine shale, and generally accepted results have been obtained 28‐30 . Li et al 31 indicated that the linkage of diagenesis to diagenetic structure mainly includes: impacts of mechanical compaction during burial history,effects of depositional facies and stratigraphy,chemical process of mineralogical conversions,fluid chemistry, temperature, and stress experienced during evolution 32‐35 . Characteristics of pore type, pore structure, PSD, and clay mineral content have obvious changes during diagenesis.…”

Section: Introductionmentioning

confidence: 99%

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Study on pore evolution and diagenesis division of a Permian Longtan transitional shale in Southwest Guizhou, China

Guo

2020

Energy Science & Engineering

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Organic‐rich shales, deposited in marine‐continental transitional environments, are widely distributed in southern China. The pore evolution of the Late Permian Longtan Formation shale (Guizhou Province) during its diagenesis and organic matter (OM) evolution was quantitatively and qualitatively investigated through thermal simulation, mercury intrusion capillary pressure, gas adsorption, fractal dimension, and field emission‐scanning electron microscopy observation. Diagenesis and OM evolution stage were subdivided on the basis of X‐ray diffraction, rock pyrolysis, and vitrinite reflectance test; moreover, the main controlling factors of pore structure during evolution were also discussed. Shales were heated to different temperatures with their vitrinite reflectance ranged between 1.23% and 3.12%, indicating that organic matter had evolved from a low‐ to a post‐mature stage. According to the changes in clay mineral composition, hydrocarbon generation, and Tmax, we subdivided diagenesis into four parts, each of which has a good correspondence with OM evolution. Pore volume (PV) varied between 0.012162 and 0.033482 cm3/g, while the specific surface area (SSA) varied between 13.3693 and 23.0094 m2/g. Mesopores were the main contributors to the total pore volume, while mesopores and micropores were the main contributors to the total specific surface area. In this study, the evolution of pore structure was not monotonous, but intermittent: The PV and SSA of shale samples first decreased and then increased. Maturity was the most important factor affecting the evolution of pore structure. The abundance of pores in OM, associated with hydrocarbon generation, resulted in large micro‐PV and micro‐SSA; moreover, the composition of clay minerals also influenced the pore structure evolution. The transformation of kaolinite into illite increased the content of illite and illite/smectite mixed layer, hence affecting the overall meso‐PV and meso‐SSA.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on pore evolution and diagenesis division of a Permian Longtan transitional shale in Southwest Guizhou, China

Guo

2020

Energy Science & Engineering

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“…On the basis of authigenic minerals, the relationship of metasomatism and dissolution-filling of different cements, features of fluid inclusions, and uniform homogenization temperature distribution, the He 8 section and Shan 1 section experienced early and late diagenetic stages and are currently in the late diagenetic stage. Combined with burial history from the study area and its adjacent regions [22,[66][67][68], the diagenetic evolution of reservoirs in the He 8 and Shan 1 sections has been further studied. During the burial process, the diagenesis in the study area was dominated by mechanical compaction due to the increased burial depth and overlying sediments.…”

Section: Diagenetic Events and Characteristicsmentioning

confidence: 99%

“…Exploration practice has revealed that the Upper Paleozoic of the Ordos Basin gas field is rich in oil and gas resources, with several large and medium-sized gas fields discovered successively in Yulin, Sulige, Wushenqi, Shenmu, Daniudi, and Zizhou have been proved successively in Upper Paleozoic [14][15][16][17][18][19][20][21][22][23]. Previous studies have been mainly focused in the central, western, northern, eastern, and southeastern parts of the basin.…”

Section: Introductionmentioning

confidence: 99%

The Evolution of Diagenetic Fluids and Accumulation Characteristics of Tight Sandstone Reservoir in Upper Paleozoic, Southwestern Ordos Basin

Zhu

et al. 2021

Geofluids

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The Upper Paleozoic in the southwestern Ordos Basin has significant potential for natural gas exploration. This study investigated the diagenetic fluid evolution and hydrocarbon accumulation characteristics of He 8 section from Permian Lower Shihezi formation and Shan 1 section from Shanxi formation tight sandstone reservoirs by petrographic observation, scanning electron microscope imaging, fluid inclusion study, and laser Raman spectrum analysis. The results show that He 8 section and Shan 1 section reservoirs are mainly composed of quartz sandstone, subordinate arkose quartz sandstone, and lithic quartz sandstone, with minor lithic sandstone and lithic arkose sandstone. The major pores are intergranular dissolved pores. The main diagenetic minerals include quartz overgrowth, siliceous cement, carbonate cement, illite, montmorillonite, and mixed-layer clay minerals. The overall diagenetic features show strong compaction, multistage siliceous and calcareous cements, and abundant clay minerals, strong dissolution, and well-developed fractures. Two stages of fluid inclusions developed in the He 8 and Shan 1 sections recorded the migration and accumulation of the early-stage and late-stage natural gas, respectively. The reservoir in the study area experienced early and late diagenetic stages, and its formation was simultaneous with or after its densification. The diagenetic environment changed from alkaline to acidic and again into alkaline. There are two stages of fluid activities in the study area, namely, the early diagenetic stage corresponding to hydrocarbon generation and migration and the late diagenetic stage corresponding to hydrocarbon accumulation. This study suggests that Upper Paleozoic natural gas migrated into the reservoir in Weibei Uplift, Yishan Slope, and Tianhuan Depression tectonic units during 220-197 Ma, and the large-scale migration and accumulation occurred in these tectonic units at different times. No natural gas was generated in the west margin of the basin because the temperatures of the hydrocarbon source rocks in the Upper Paleozoic were below the gas window.

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“…The gasification coal char was crushed and ground, then the gasified solid products were crushed into 60–80 meshes. The Micromeritics ASAP2020 specific surface analyzer was used to determine the specific surface area, pore volume, pore diameter, pore distribution, and isothermal adsorption and desorption analysis (Chen et al., 2017; Fu et al., 2017; Li et al., 2019a, 2019b, 2019c, 2020).…”

Section: Analysis Of Gas Composition and Pore Structure Variationmentioning

confidence: 99%

Coal char characteristics variation in the gasification process and its influencing factors

Yin

Chen

Zhao

2020

Energy Exploration & Exploitation

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Underground coal gasification is a burgeoning coal exploitation technique that coal is directly converted into gaseous fuel by controlled combustion. In this paper, the gasification experiments of Inner Mongolia lignite, Xinjiang subbituminous coal, and Hancheng medium volatile bitumite were conducted respectively by using the tube furnace coal gasification experiment system. The gasification process was conducted under 3°C/min increment within the range of 600–900°C. The gas composition was analyzed by gas chromatography and the pore structure of the coal char was detected by low-temperature N2 adsorption. The results show that the gasification temperature, gasification agent, and coal type have an important influence on the gasification reaction. With the increase of gasification temperature, the effective component, gas calorific value, and gas production rate increase. When CO2 is used as the gasifying agent, the effective components in the gas are mainly CO. When H2O(g) is used as the gasifying agent, the effective component of gas is H2. The coal gasification performance with low thermal maturity is obvious better than the high rank coal with higher coalification. N2 adsorption–desorption experiments show that the pore is mainly composed by transition pore and the micropores, the specific surface area is chiefly controlled by a pore size of 2–3 nm. With the increase of coalification degree, the adsorption amount, specific surface area, and total pore volume show a decreasing trend. The gasifying agent has a great influence on the pore structure of the coal char. The gasification effect of H2O (g) is significantly better than that of CO2. Analyzing the gasification characteristics and pore changes of different coal rank coals under different gasification agents, we found that Inner Mongolia lignite is more conducive to the transport of gasification agents and gaseous products in coal.

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Diagenetic sequences of continuously deposited tight sandstones in various environments: A case study from upper Paleozoic sandstones in the Linxing area, eastern Ordos basin, China

Cited by 61 publications

References 75 publications

Study on pore evolution and diagenesis division of a Permian Longtan transitional shale in Southwest Guizhou, China

Study on pore evolution and diagenesis division of a Permian Longtan transitional shale in Southwest Guizhou, China

The Evolution of Diagenetic Fluids and Accumulation Characteristics of Tight Sandstone Reservoir in Upper Paleozoic, Southwestern Ordos Basin

Coal char characteristics variation in the gasification process and its influencing factors

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