Siliceous Cementation of Chlorite-Coated Grains in the Permian Sandstone Gas Reservoirs, Ordos Basin

Fan, Aiping; Yang, Renchao; Li, Jinbu; Zhao, Zhenjiang; Loon, A.J. van

doi:10.1111/1755-6724.13336

Cited by 21 publications

(10 citation statements)

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“…Presence of solution-enlarged pores is usually a favorable condition that improves the petrophysical properties of sandstone reservoirs (Yang et al, 2014;Fan et al, 2017). This is also true for the study area where solution-enlarged pores form an important additional pore space within the Carboniferous rocks (Fig.…”

Section: Accepted Manuscriptmentioning

confidence: 62%

Characteristics, controls and geological models of hydrocarbon accumulation in the Carboniferous volcanic reservoirs of the Chunfeng Oilfield, Junggar Basin, northwestern China

Yong

Yang

Song

et al. 2018

Marine and Petroleum Geology

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The Junggar Basin is one of the most important basins for hydrocarbon production in China. Within the basin, the Chunfeng Oilfield forms one of the most important oilfields of the area. Despite the significant work that has been done on the rocks of the oilfield so far, a detailed reservoir characterization and description of the hydrocarbon accumulation pattern was still missing. Therefore, an investigation had been initiated to fill this gap in our understanding of the hydrocarbon reservoirs of the 2 ACCEPTED MANUSCRIPT Junggar Basin. The results of this study show that the tuff and andesitic lava lithofacies exhibit the highest reservoir potential in the area. Apart from the lithofacies, the results of this study show that tectonic (formation of fault systems) and diagenetic (formation of solution pores) effects, and the development of a weathering crust are crucial factors that control the quality of the petroleum reservoirs of the oilfield. In addition, two possible geological models of petroleum accumulation in isolated volcanic rocks and sandstone (IVRS) and connected volcanic rocks and sandstone (CVRS) are presented.

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Section: Accepted Manuscriptmentioning

confidence: 62%

Characteristics, controls and geological models of hydrocarbon accumulation in the Carboniferous volcanic reservoirs of the Chunfeng Oilfield, Junggar Basin, northwestern China

Yong

Yang

Song

et al. 2018

Marine and Petroleum Geology

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“…Many studies show that tight sandstone has experienced strong diagenesis (Fan et al, 2015;Liu et al, 2016;Fan et al, 2017), including compaction, siliceous cementation and calcareous cementation, by which the primary intergranular pores were severely damaged (Lv and Liu, 2009), with only some residual intergranular pores preserved and the pore sizes (pore radius) greatly reduced (Xue et al, 2015;Zhang et al, 2018). The contact relationship between grains evolved from point contact in the initial stages of deposition to line contact and surface contact after diagenesis, so the throats in tight sandstone are generally long, thin, narrow, and in lamellar or curved lamellar shapes .…”

Section: Analysis Of Factors Influencing the Electrical Characteristimentioning

confidence: 99%

Numerical Simulation of the Influence of Pore Structure on Resistivity, Formation Factor and Cementation Index in Tight Sandstone

Wen

Yao

et al. 2020

Acta Geologica Sinica (Eng)

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Tight sandstone, with severe diagenesis and complex pore structure, differs greatly from conventional sandstone in terms of rock electrical parameters. In subsurface rock electrical experiments, various electrical parameters are confounded and can only be analyzed qualitatively. The lack of quantitative analysis for each individual electrical parameter presents a challenge for the evaluation of oil and gas saturation in tight sandstone. Based on the 2D pore‐throat model and the features of pore structure in the tight sandstone of the Penglaizhen and Shaximiao Formations in the upper and middle Jurassic of the Western Sichuan Depression, this paper presents 3D micro pore‐throat models for three types of tight sandstone. It proposes a finite element‐based rock electrical simulation method to analyze the influence of pore structure parameters, such as throat radius and throat tortuosity, on electrical parameters such as resistivity, formation factor, and cementation index quantitatively. The research revealed the following results: (1) Throats of tight sandstone usually have lamellar or curved lamellar shapes that are slender and narrow. The lamellar throat used in the proposed pore‐throat model is more consistent with the features of tight sandstone than the tubular throat used in the original model. (2) The throat determines the conductivity of tight sandstone. The throat parallel to the electric potential has the greatest influence on conductivity, and the throat perpendicular to the potential has the least influence. (3) In tight sandstone grades I to III, as the porosity decreases, the formation factor increases and the cementation index decreases. (4) The results of the rock electrical simulation are consistent with the results of the rock electrical experiment, which indicates that the proposed rock electrical simulation method of tight sandstone is effective and accurate.

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“…During burial diagenesis, the smectite-to-illite transformation and the recrystallization of biogenic opal-A to opal-CT may release Si (Awwiller, 1993;Fan et al, 2017;Schieber, 2010), but the final sink of this Si is still unclear (Taylor and Macquaker, 2014). The quartz of the Wufeng and Longmaxi Formations consists of both detrital and authigenic quartz; the latter is dominant (Han et al, 2016;Zhao et al, 2017;Han et al, 2018).…”

Section: Shale Pores Associated With Quartzmentioning

confidence: 99%

Mineral compositional controls on the porosity of black shales from the Wufeng and Longmaxi Formations (Southern Sichuan Basin and its surroundings) and insights into shale diagenesis

Han

et al. 2018

Energy Exploration & Exploitation

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The effects of brittle minerals in shale diagenesis on shale pores remain controversial and it is difficult to quantify directly. However, the relationship between brittle minerals and shale pores could provide indirect guidance regarding diagenesis processes in post-mature marine shales. In this study, the pore size distribution was determined, and the relationship between pore volume and shale composition was examined in shale samples with different total organic carbon contents from the Wufeng and Longmaxi Formations, with the objective of distinguishing pore size ranges in organic matter and inorganic minerals, respectively, and studying shale diagenesis. The samples of the Wufeng and Longmaxi shales are composed of clay minerals, calcite, dolomite, quartz, feldspar, and some minor components. The pore size distributions, which were determined using nitrogen adsorption isotherm analysis of shale and kerogen, show similar trends for pore sizes less than approx. 6.5 nm but different trends for larger pore sizes. Mercury injection saturation shows that macropores account for 14.4–22% of the total pore volume. Based on a series of crossplots describing the relationships between shale composition and pore volume or porosity associated with different pore sizes as well as on scanning electron microscopy observations, organic matter pores were found to comprise most of the micro-mesopores (pore diameters < 6.5 nm). Organic matter pores and intraparticle pores associated with carbonate constitute the majority of mesopores (pore diameters 6.5–50 nm). Finally, interparticle pores associated with quartz comprise the majority of the macropores. The mesopores associated with carbonate were formed by dissolution during diagenesis, whereas the macropores associated with quartz are the remainders of the original interparticle pores. Mesopore volumes increase with increasing carbonate content while macropore volumes decrease due to the ‘pore size controlled solubility’ effect, which causes dissolved calcium carbonate to precipitate in larger macropores.

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Siliceous Cementation of Chlorite-Coated Grains in the Permian Sandstone Gas Reservoirs, Ordos Basin

Cited by 21 publications

References 0 publications

Characteristics, controls and geological models of hydrocarbon accumulation in the Carboniferous volcanic reservoirs of the Chunfeng Oilfield, Junggar Basin, northwestern China

Characteristics, controls and geological models of hydrocarbon accumulation in the Carboniferous volcanic reservoirs of the Chunfeng Oilfield, Junggar Basin, northwestern China

Numerical Simulation of the Influence of Pore Structure on Resistivity, Formation Factor and Cementation Index in Tight Sandstone

Mineral compositional controls on the porosity of black shales from the Wufeng and Longmaxi Formations (Southern Sichuan Basin and its surroundings) and insights into shale diagenesis

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