Quartz dissolution in a single phase-high pH Berea sandstone via alkaline injection

Ali, Abdullah Musa; Kwaya, Mohammed Yerima; Mijinyawa, Abubakar Hamisu

doi:10.1016/j.engeos.2021.03.001

Cited by 7 publications

(6 citation statements)

References 15 publications

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“…The restoration of single well formation thickness is the basis to obtain the bottom of an ancient lake basin morphology and topography 36,37 . Its mathematical model has the following assumptions: ① it is assumed that the skeleton volume of rock remains unchanged before and after the compaction; ② the depth and porosity conform to the functional relationship: ϕ = ϕ 0 e − CH .…”

Section: Methodsmentioning

confidence: 99%

“…The grain‐supported structural sandstone is iterated using a formula (). For grain‐supported sandstone and mudstone, the empirical formula K = b ‐ a ln h is used ( K is the compression coefficient, h is the present burial depth, a and b are the constants of shale a = 0.1, b = 1.46; and for sandstone, a = 0.08, b = 1.37) for compaction correction 21,36 …”

Section: Methodsmentioning

confidence: 99%

“…The restoration of single well formation thickness is the basis to obtain the bottom of an ancient lake basin morphology and topography. 36,37 Its mathematical model has the following assumptions: ① it is assumed that the skeleton volume of rock remains unchanged before and after the compaction; ② the depth and porosity conform to the functional relationship: ϕ = ϕ 0 e −CH . Where ϕ is the porosity, ϕ 0 is the initial porosity, C is the compaction coefficient, and H is the burial depth; and ③ the initial porosity ϕ 0 and the compaction coefficient C are only related to the lithologic combinations in the formation.…”

Section: Single Well Formation Thickness Recoverymentioning

confidence: 99%

“…For grain-supported sandstone and mudstone, the empirical formula K = b-alnh is used (K is the compression coefficient, h is the present burial depth, a and b are the constants of shale a = 0.1, b = 1.46; and for sandstone, a = 0.08, b = 1.37) for compaction correction. 21,36 In the sandstone segments of the study area, the sample points of the grain-supported structure account for about 50%. The high precision compaction correction for this part of sandstone also improves the accuracy of formation compaction correction in the entire study area.…”

Section: Single Well Formation Thickness Recoverymentioning

confidence: 99%

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Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 8₂ submember, southwest Ordos Basin

Liao,

Xiao,

Long

et al. 2024

Energy Science & Engineering

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Beach bar sand bodies are a relatively new type of reservoir in oil exploration where they can be found in the proximity of the source rock. In this study, the genetic type of sand bodies in the Upper Triassic Yanchang Formation in the southwest Ordos Basin is systematically studied through the observation of outcrops, core description, microscopic inspection of thin sections, along with petrophysical properties, mineralogy, and geochemical analysis of trace elements. The results showed that a new sedimentary type of beach bar sand bodies are developed in the Chang 82 submember of the Yanchang Formation, that are generally characterized with a flat bottom and convex top, where the contact interface between the bottom of the single sand body and mudstone is flat, and the bottom lacks erosion and filling structure. Moreover, a variety of wave‐induced sedimentary structures are developed, showing a reverse sedimentary sequence from fine to coarse grains. The structural and compositional maturity of the beach bar sand bodies are higher than that of the river channel sand body. Moreover, reservoir pore type is mainly comprised of intergranular pores, and the porosity and permeability of the samples retrieved from the sand body are much higher than that of the river channel sand body. Finally, the main controlling factors of the formation and preservation of beach bar sands are found to be the lake basin bottom topography, the base level cycle, and the stable paleo‐lake shoreline. During the Chang 82 submember depositional period, a large area where the beach bar sand bodies were deposited parallel to the lake shoreline in the southwest of the basin was created. Such depositional environments had suitable conditions to host large‐scale oil‐bearing reservoirs, as major exploration and development targets in the Ordos Basin in the future.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Single Well Formation Thickness Recoverymentioning

confidence: 99%

Section: Single Well Formation Thickness Recoverymentioning

confidence: 99%

See 2 more Smart Citations

Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 8₂ submember, southwest Ordos Basin

Liao,

Xiao,

Long

et al. 2024

Energy Science & Engineering

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“…As non-traditional oil and gas resources, tight sandstone oil and gas have become a "hot spot" in the field of oil and gas development due to their huge resources [1,2]. Porosity and permeability, the important petrophysical parameters in conventional reservoir evaluation, also play a key role in the quality evaluation of tight sandstone reservoirs [3][4][5]. At the same time, the pore-throat structure of tight sandstone reservoirs cannot be ignored [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Study of Pore–Throat Structure in Tight Triassic Sandstone: A Case Study on the Late Triassic Yanchang Formation, Southwestern Ordos Basin, China

Xiao,

Wang,

Ning

et al. 2024

Minerals

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In order to better understand pore–throat structure characteristics, the coupling relationship between micropore–throat structure and macro reservoir quality and influencing factors caused by authigenic minerals were studied. Petrographic analyses, scanning electron microscopy (SEM), pressure-controlled mercury injection (PMI), nuclear magnetic resonance (NMR), and X-ray diffraction (XRD) were performed on a suite of tight reservoir samples from the Chang 8 Member of the Upper Triassic Yanchang Formation in the southwestern Ordos Basin, China. The results show that the pore–throat sizes obtained with the combination of PMI and NMR methods varied from nano- to microscale, revealing pore–throat sizes ranging from 0.001 μm to 70 μm, and showing that pore–throats with a radius larger than 1.0 μm are rare. Larger pore–throats with good connectivity (>rapex) account for a smaller part of the total pore volume, ranging from approximately 7.58% to 38.90% with an average of 22.77%, but account for more than 80% of contributions to permeability. The effective movable fluid porosity (φemp) measured by NMR, ranging from approximately 0.10% to 7.07% with an average of 2.56%, had a positive contribution to permeability. The contents of chlorite occurrence state, other than illite, are beneficial to pore–throat preservation. A new reservoir evaluation scheme of the Chang 8 reservoir is established. These research results provide a theoretical basis for the evaluation and development of tight sandstone oil and gas exploration.

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Binding mechanisms of trivalent chromium on colloidal phases from ultramafic systems: Insights from batch experiments and XAS analysis

Nguyen,

Marsac,

Groleau

et al. 2025

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Quartz dissolution in a single phase-high pH Berea sandstone via alkaline injection

Cited by 7 publications

References 15 publications

Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 8₂ submember, southwest Ordos Basin

Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 8₂ submember, southwest Ordos Basin

Study of Pore–Throat Structure in Tight Triassic Sandstone: A Case Study on the Late Triassic Yanchang Formation, Southwestern Ordos Basin, China

Binding mechanisms of trivalent chromium on colloidal phases from ultramafic systems: Insights from batch experiments and XAS analysis

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Quartz dissolution in a single phase-high pH Berea sandstone via alkaline injection

Cited by 7 publications

References 15 publications

Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 82 submember, southwest Ordos Basin

Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 82 submember, southwest Ordos Basin

Study of Pore–Throat Structure in Tight Triassic Sandstone: A Case Study on the Late Triassic Yanchang Formation, Southwestern Ordos Basin, China

Binding mechanisms of trivalent chromium on colloidal phases from ultramafic systems: Insights from batch experiments and XAS analysis

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Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 8₂ submember, southwest Ordos Basin

Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 8₂ submember, southwest Ordos Basin