Diagenesis and reservoir quality of the Lower Cretaceous Quantou Formation tight sandstones in the southern Songliao Basin, China

Xi, Kelai; Cao, Yingchang; Jahren, Jens; Zhu, Rixiang; Bjørlykke, Knut; Haile, Beyene Girma; Zheng, Lijing; Hellevang, Helge

doi:10.1016/j.sedgeo.2015.10.007

Cited by 141 publications

(72 citation statements)

References 43 publications

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“…Porosity and permeability show negative relationship with carbonate cements content ( Fig. 13) (see also (Bowman, 1998;Xi et al, 2015). Conversely, there is no significant relationship between quartz cement content and reservoir properties 20 ( Fig.…”

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confidence: 87%

Prediction of diagenetic facies using well logs – A case study from the upper Triassic Yanchang Formation, Ordos Basin, China

Cui

Wang

Jones

et al. 2017

Marine and Petroleum Geology

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(2017) 'Prediction of diagenetic facies using well logs a case study from the upper Triassic Yanchang Formation, Ordos Basin, China.', Marine and petroleum geology., 81 . pp. 50-65. Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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confidence: 87%

Prediction of diagenetic facies using well logs – A case study from the upper Triassic Yanchang Formation, Ordos Basin, China

Cui

Wang

Jones

et al. 2017

Marine and Petroleum Geology

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“…() (open blue squares), and ferrous carbonate cement in the southern Songliao Basin reported by Xi et al . () (open circles) are also plotted. Values are also plotted for calcite cement near Green River in Utah, United States (Wigley et al .…”

Section: Resultsmentioning

confidence: 99%

“…; Curtis ; Morad ; Xi et al . ). For example, the carbon isotope values of ferrocalcite related to CO 2 derived from decarboxylation of organic matter in the Central Depression, southern Songliao Basin, are −12.2‰ to −0.9‰ (Fig.…”

Section: Discussionmentioning

confidence: 97%

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Bleached mudstone, iron concretions, and calcite veins: a natural analogue for the effects of reducing CO₂‐bearing fluids on migration and mineralization of iron, sealing properties, and composition of mudstone cap rocks

Ming

Liu

et al. 2016

Geofluids

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This study investigates the Wangfu Depression of the Songliao Basin, China, as a natural analogue site for Fe migration (bleaching) and mineralization (formation of iron concretions) caused by reducing CO2‐bearing fluids that leak along fractures after carbon capture, utilization, and storage. We also examined the origin of fracture‐filling calcite veins, the properties of self‐sealing fluids, the influence of fluids on the compositions of mudstone and established a bleaching model for the study area. Our results show that iron concretions are the oxidative products of precursor minerals (pyrite and siderite) during uplift and are linked to H2S and CO2 present in early stage fluids. The precipitation of calcite veins is the result of CO2 degassing and is related to CO2, CH4, and minor heavy hydrocarbons in the main bleaching fluids. In our model, fluids preferentially enter high‐permeability fracture systems and result in the bleaching of surrounding rocks and precipitation of calcite veins. The infilling of calcite veins significantly decreases the permeability of fractures and forces the fluids to slowly enter and bleach the mudstone rocks. The Fe2+ released during bleaching migrates to elsewhere with the solutions or is reprecipitated in the calcite veins and iron concretions. The formation of calcite veins reduces the fracture space and effectively prevents fluid flow. The fluids have an insignificant effect on minerals within the mudstone. In terms of the chemistry of the mudstone, only the contents of Fe2O3, U, and Mo change significantly, with the content of U increasing in the mudstone and the contents of Fe2O3 and Mo decreasing during bleaching.

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“…In general, sandstones near the sandstone or shale contacts are more susceptible to external fluid, thereby more possible to be tightly cemented (Figure a and b). Theoretically speaking, quartz cement is another major cause of porosity loss in many petroleum reservoirs (Xi et al, , ). Authigenic clays, often leading to filling or plugging of pores or throats, are generally regarded as a reservoir quality deteriorating mechanism (Schmid, Worden, & Fisher, ; Xi et al, ).…”

Section: Discussionmentioning

confidence: 99%

Diagenesis of tight oil sand reservoirs: Upper Triassic tight sandstones of Yanchang Formation in Ordos Basin, China

Dou

Liu

et al. 2017

Geological Journal

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Upper Triassic sandstones in the Ordos Basin, northern‐central China, comprise tight oil reservoirs. Using a combination of thin sections, SEM, BSE, EDS, XRD, and fluid inclusion analyses, 24 core samples from 13 wells were collected to study the petrology, paragenesis, and diagenetic processes and implications for reservoir quality. Quartz cement usually occurs as overgrowths or euhedral quartz. Extensive dissolution and albitization of K‐feldspar can be observed. Five types of carbonate cements, ferrocalcite, ankerite, dolomite, calcite, and siderite, occur during different diagenetic stages. Two main types of illite and 5 main habits of chlorite are observed in this study. Kaolinite mainly occurs as booklets and vermicular aggregates. Diagenetic illite, chlorite, biotite, mixed‐layer illite/smectite (I/S), and other minor minerals are also observed. The diagenetic processes include compaction, alteration of volcanic materials and mica, clay mineral transformation, cementation (silica, aluminosilicate, and carbonate), and dissolution of feldspars and rock fragments. Compaction was a significant porosity‐reducing agent, and the presence of carbonate cement exerts a dominant impact on the reduction of porosity. Quartz cement and authigenic clays are less important; however, it is worth mentioning that pore‐lining clays are conducive to porosity preservation. In this study, most of the porosity variation is caused by a combination of compaction, carbonate cements, quartz cement, and authigenic clays. This study gives insights into diagenetic alterations within tight sandstones and has implications for reservoir quality prediction in similar settings.

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Diagenesis and reservoir quality of the Lower Cretaceous Quantou Formation tight sandstones in the southern Songliao Basin, China

Cited by 141 publications

References 43 publications

Prediction of diagenetic facies using well logs – A case study from the upper Triassic Yanchang Formation, Ordos Basin, China

Prediction of diagenetic facies using well logs – A case study from the upper Triassic Yanchang Formation, Ordos Basin, China

Bleached mudstone, iron concretions, and calcite veins: a natural analogue for the effects of reducing CO₂‐bearing fluids on migration and mineralization of iron, sealing properties, and composition of mudstone cap rocks

Diagenesis of tight oil sand reservoirs: Upper Triassic tight sandstones of Yanchang Formation in Ordos Basin, China

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Diagenesis and reservoir quality of the Lower Cretaceous Quantou Formation tight sandstones in the southern Songliao Basin, China

Cited by 141 publications

References 43 publications

Prediction of diagenetic facies using well logs – A case study from the upper Triassic Yanchang Formation, Ordos Basin, China

Prediction of diagenetic facies using well logs – A case study from the upper Triassic Yanchang Formation, Ordos Basin, China

Bleached mudstone, iron concretions, and calcite veins: a natural analogue for the effects of reducing CO2‐bearing fluids on migration and mineralization of iron, sealing properties, and composition of mudstone cap rocks

Diagenesis of tight oil sand reservoirs: Upper Triassic tight sandstones of Yanchang Formation in Ordos Basin, China

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Bleached mudstone, iron concretions, and calcite veins: a natural analogue for the effects of reducing CO₂‐bearing fluids on migration and mineralization of iron, sealing properties, and composition of mudstone cap rocks