Influence of sedimentation and diagenesis on reservoir physical properties: a case study of the Funing Formation, Subei Basin, eastern China

Wang, Jinkai; Fu, Yuxiang; Yan, Zhaoxun; Fu, Jialin; Xie, Jun; Li, Kaikai; Yang, Zhao

doi:10.1007/s11707-020-0836-y

Cited by 5 publications

(3 citation statements)

References 46 publications

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“…The main reason is that, on the one hand, the fractures formed at the axis of the noselike fold are favorable for oil and gas migration; on the other hand, there are differences in the hydrocarbon accumulation capacity of different structural units such as monoclinic, nose-like uplift and structural high point. In the case of consistent oil and gas migration, oil and gas molecules will choose the shortest path (ie, the vertical contour direction) when they migrate upwards through buoyancy (Wang et al, 2021). Therefore, in general, the hydrocarbon accumulation capacity of different structural units such as monoclinic, nose-like uplift, and structural high point will change from weak to strong (Figure 12).…”

Section: Effects Of Nose-like Uplifts On Hydrocarbon Accumulationmentioning

confidence: 99%

Reservoir properties and hydrocarbon enrichment law of Chang 1 oil layer group in Yanchang Formation, Wanhua area, Ordos Basin

Xue²,

Sun³

et al. 2023

Front. Earth Sci.

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Evaluation of tight oil reservoir properties is of great significance to the exploration of oil and gas in tight reservoirs. The Chang 1 Member of the Yanchang Formation in the Wanhua Area, Ordos Basin is a new exploration stratum for tight sandstone oil. The lack of understanding of reservoir characteristics and crude oil enrichment rules has seriously restricted the efficient development of oil and gas resources in this stratum. In this study, the reservoir characteristics of the Chang 1 Member in the Wanhua area and the effects of superimposed sand bodies, structures and paleogeomorphology on accumulation of hydrocarbons were systematically studied. The Chang 1 sandstone is a typical ultra-low porosity-ultra-low permeability reservoir, and it has experienced destructive diagenesis of mechanical compaction, pressure solution and cementation, and constructive diagenesis of dissolution. Strong pressure solution caused the secondary enlargement of quartz and feldspar and the formation of patchy dense mosaic structures. The target layer has experienced argillaceous, siliceous and carbonate cementations. Moreover, the sandstone reservoir in the Chang 1 Member also experienced strong dissolution, and it is the main factor for the formation of secondary pores and the improvement of reservoir physical properties. The study also found that the main types of pores in the Chang 1 Member are intergranular dissolved pores and remaining intergranular pores. Superimposed sand bodies, nose-shaped uplifts, dominant facies and eroded paleo-highlands have significant effects on the hydrocarbon accumulation. Based on this study, it was found that the migration and accumulation mode of hydrocarbons in the Chang 1 reservoir belongs to the ladder-like climbing migration + structural ridge accumulation type. In addition, sand body thickness is an important controlling factor for the hydrocarbon accumulation. At present, the discovered crude oil in the Chang 1 Member is always distributed in the areas with thick sand bodies (>20 m), and most of the sand bodies have a thickness in the range of 25–40 m, and the effective thickness is in the range of 2–6 m. In addition, the eroded highlands are the highest topographic units, they are favorable areas for the large-scale accumulation of oil and gas.

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Section: Effects Of Nose-like Uplifts On Hydrocarbon Accumulationmentioning

confidence: 99%

Reservoir properties and hydrocarbon enrichment law of Chang 1 oil layer group in Yanchang Formation, Wanhua area, Ordos Basin

Xue²,

Sun³

et al. 2023

Front. Earth Sci.

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“…Sedimentation is the most direct geological factor affecting the pore structure of the sand layer [56,57]. Changes in hydrodynamic forces in different sedimentary environments lead to changes in the accumulation, arrangement direction, and particle size of debris in the sand layer, thus restricting the formation and development of late diagenesis [58,59]. The sedimentary facies of the Jurassic Zhiluo Formation in the study area mainly included braided rivers and meandering rivers [46,60,61]; these facies have laid a good geological foundation for pore development.…”

Section: Sedimentation and Pore Structurementioning

confidence: 99%

Pore Structure Characteristics and Main Control Factors of Sandstone in the Jurassic Zhiluo Formation in the Northern Ordos Basin

Liu,

Guo,

Hong

et al. 2023

Minerals

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The Jurassic Yan’an Formation in the Ordos Basin is one of the main coal seams mined in the basin, and the enrichment of water bodies in the upper part of this coal seam is closely related to the sand bodies in the Zhiluo Formation. This study is based on the use of core observations in the northern part of the Ordos Basin for studying the pore characteristics of the permeable sand layer of the Zhiluo Formation in the study area through testing methods such as ordinary thin sections, cast thin sections, scanning electron microscopy (SEM), mercury intrusions, and physical property analysis. The results indicate that the primary pores of the Zhiluo Formation sandstone in the study area include primary intergranular pores, residual intergranular pores, and interstitial micropores. The secondary pores are mainly intergranular pores, feldspar dissolution pores, and rock debris dissolution pores. The throat-type pores are mainly variable fault contractions, sheets, curved sheets, and bundle-shaped throats. The pore structures of the Zhiluo Formation sandstone in the research area are complex, and the permeability is influenced by the throat characteristics. The main controlling factors of the pore structure characteristics of the Zhiluo Formation sandstone in the study area are sedimentation and diagenesis. Compaction and cementation are the main factors that destroy the sandstone pore structure, while later dissolution plays a certain role in the improvement of the pores. Section 1 of the Zhiluo Formation is greatly affected by diagenesis, and section 2 is greatly affected by sedimentation.

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“…Dissolution and leaching of the cement and rock constituents are very common in the sandstone reservoirs. These can potentially enhance the potentiality of tight sandstone reservoirs (Lai et al 2020;Sen et al 2021;Wang et al 2021;Farouk et al 2022). Yuan et al (2015) and Mosavat et al (2019) pointed towards the organic acids and CO 2 being the primary agent yielding dissolution in sandstones which might have generated by the thermal evolution of the organic matter.…”

Section: Diagenetic Processes Affecting Rahmi Sandstonesmentioning

confidence: 99%

Reservoir characterization of the middle Miocene Kareem sandstones, Southern Gulf of Suez Basin, Egypt

Farouk

Sen²,

Pigott

et al. 2022

Geomech. Geophys. Geo-energ. Geo-resour.

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In this study, we have assessed the petrographical and petrophysical characteristics of the progradational, syn-rift Middle Miocene Rahmi sandstone gas reservoir (Lower Kareem Formation) from the East Matr and Amal hydrocarbon fields, southern Gulf of Suez by integrating sidewall cores and wireline logs. We interpreted a reservoir gas gradient of around 0.09 psi/ft from the downhole pressure measurements. Based on well log-based petrophysical analyses, we interpreted that the Rahmi reservoir in the East Matr field has a 0.10–0.18 v/v total porosity, 0.08–0.14 v/v effective porosity, 0.08–0.17 v/v shale volume along with water saturation ranging between 0.09 and 0.32 v/v. The correlated reservoir in the Amal field is observed to have higher porosities (0.17–0.22 v/v total porosity and 0.15–0.19 v/v effective porosity), although it exhibits higher water saturation (0.38–0.54 v/v). The reservoir consists of very fine to coarse grained, poorly to moderately sorted, subangular to subrounded, poorly cemented and moderately compacted sublithic, subarkosic and arkosic arenites with moderate to good intergranular porosity. Abundant lithic fragments and poor textural maturity of the Rahimi sandstones imply a high energy shoreface depositional environment in close proximity to the hinterland. Porosity reduction is attributed to dolomite cementation, kaolinite, formation of pseudomatrix by mechanical compaction of argillaceous lithics, and quartz overgrowth. Long and concavo-convex intergranular contacts indicate that silica needed for quartz cementation was derived by moderate degree of chemical compaction of the quartz grains. Partial to near-complete dissolution of the labile grains (feldspar and lithics) and dolomite attributed to the reservoir quality improvement. Scattered dolomite cements prevented more severe mechanical and chemical compaction.

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Influence of sedimentation and diagenesis on reservoir physical properties: a case study of the Funing Formation, Subei Basin, eastern China

Cited by 5 publications

References 46 publications

Reservoir properties and hydrocarbon enrichment law of Chang 1 oil layer group in Yanchang Formation, Wanhua area, Ordos Basin

Reservoir properties and hydrocarbon enrichment law of Chang 1 oil layer group in Yanchang Formation, Wanhua area, Ordos Basin

Pore Structure Characteristics and Main Control Factors of Sandstone in the Jurassic Zhiluo Formation in the Northern Ordos Basin

Reservoir characterization of the middle Miocene Kareem sandstones, Southern Gulf of Suez Basin, Egypt

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