Crude oil mobility and its controlling factors in tight sand reservoirs in northern Songliao Basin, East China

Feng, Jianglin; Zhang, Bowei; Feng, Zihui; Wang, Yachun; Zhang, Juhe; Fu, Xiaofei; Sun, Yonghe; Huo, Quan; Shao, Hongmei; Zeng, Huasen; Qu, Bin; Chi, Huanyuan

doi:10.1016/s1876-3804(19)60012-1

Cited by 10 publications

(5 citation statements)

References 15 publications

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“…The Yaojia Formation underlies the First to Second members of the Nenjiang Formation with a conformity contact, which was deposited continuously in the Songliao Basin. An unconformity contact may occur between the Third to Fifth members of the Nenjiang Formation and the First and Second members of the Nenjiang Formation (Feng et al, 2019). The borehole Zk09 lithology showed continuous sedimentation, except for a scour mark at 40.9 m between the sandstone and mudstone layers, indicating an interruption during deposition.…”

Section: Discussionmentioning

confidence: 99%

“…The Songliao Basin, located in Northeast China, is a continental sedimentary basin with abundant oil and gas resources (Feng et al, 2019). Its Western Slope is a vast, gently dipping area covering 2.5 × 10 4 km 2 , including the western part of the central axis of the Qijia‐Gulong Sag and the Longhupao‐Da'an terrace (Wang et al, 2018) (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

“…The Songliao Basin, located in Northeast China, is a continental sedimentary basin with abundant oil and gas resources (Feng et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Late Cretaceous stratigraphic division in the northwestern Songliao Basin, Northeast China: Evidence from palaeontology and palaeomagnetism

et al. 2023

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This paper combines new palaeomagnetic studies, palaeontological dating, and sedimentary analyses to propose a modified stratigraphic classification scheme in the northwestern Songliao Basin, which is of great significance for stratigraphic correlation, sedimentation analysis, basinal subsidence, and oil and gas exploration. New palaeontological and palaeomagnetic evidence redefined a group of semi‐consolidated lacustrine strata, buried beneath the Quaternary Yaluhe Formation on the Western Slope of the Songliao Basin, as Late Cretaceous, not the Middle Pleistocene. The chronostratigraphic framework re‐evaluates its stratigraphic age as late Coniacian to early Campanian (Late Cretaceous), between 83 and 85 Ma. Sedimentation research from 17 boreholes on the Western Slope of the Songliao Basin displays that the semi‐consolidated strata successively experienced lacustrine and delta facies deposits. Comparison of this new stratigraphy with the Late Cretaceous sequences on the adjacent Central Depression of the Songliao Basin reveals significant variations in lithology and palynological assemblages. Three new palynological assemblages are also reported from the Late Cretaceous sequences of the Songliao Basin.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Late Cretaceous stratigraphic division in the northwestern Songliao Basin, Northeast China: Evidence from palaeontology and palaeomagnetism

et al. 2023

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“…Because the converting factors are different among various methods, usually the T 2 value was used directly to represent the pore size. Centrifugation experiment can simulate the displacement process because the liquid cannot be moved out of the pore structure until the capillary force is lower than the centrifugation force, which has been widely used to distinguish the movable and irreducible water. − Combining NMR, centrifugation experiments, and heat-treating methods, water can be subdivided into different fluid types in tight sand, and a nine-grid model provided a method for this analysis . The movable liquid content changes with displacement pressure, and the higher the centrifugal speed is, the higher the movable liquid. − By changing the centrifugal speeds, the displacement efficiency can be obtained in reservoirs with different initial oil/gas pressures.…”

Section: Introductionmentioning

confidence: 99%

Rock Fabric of Tight Sandstone and Its Influence on Irreducible Water Saturation in Eastern Ordos Basin

Meng

Shen

et al. 2023

Energy Fuels

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After flowback, the residual fracturing fluid will reduce the gas seepage space and influence natural gas production, which attracts widespread attention. In this study, the irreducible water saturation was investigated, and its controlling factors were clarified. We target the Upper Paleozoic Taiyuan and Shihezi Formations, which belong to a tight gas reservoir in the eastern Ordos Basin. The main experiments include porosity, permeability, mineral composition, nitrogen adsorption, mercury intrusion porosimetry, nuclear magnetic resonance, and high-speed centrifugation. The specific surface area is very low and varies from 0.95 to 4.03 m 2 /g, and the median pore-throat diameter ranges from 28.6 to 698.6 nm. Through the T 2 cutoff value, the water saturation can be divided into movable water saturation (S mov ) and irreducible water saturation (S irr ). Furthermore, the S irr can be divided into water saturation in large pores controlled by the small throat (S irrl ) and water saturation controlled by the capillary force (S irrc ). In both formations, the S irr has a negative relationship with porosity, permeability, and average pore diameter and exhibits a positive relationship with the specific surface area. The S irrl has a positive relationship with the median pore-throat diameter in Taiyuan Formation, but the S irrl has a weak relationship with the median pore-throat diameter in Shihezi Formation. The S irrc has a negative relationship with porosity, permeability, and average pore diameter and displays a positive relationship with the specific surface area in Taiyuan Formation, but the S irrc has a weak relationship with these parameters in Shihezi Formation. The relationship difference between Taiyuan and Shihezi Formations was mainly caused by the pore structure, demonstrated by the amplitude ratio in three peaks. Based on the above analysis, this study is conducive to understanding the mechanism of water occurrence and its controlling factors.

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“…Moreover, the free oil content always is regarded as the maximum amount of movable oil, and the actual recovery ratio is much lower than this value. Based on supercritical CO 2 displacement method, Feng et al (2019) characterized the movable efficiency and movable lower limit of tight oil and clarified the relationship between movable oil rate and reservoir physical properties. This method represents the maximum amount of crude oil that can be recovered in tight reservoir by existing technologies, but it cannot be carried out on a large scale due to the production cost constraints.…”

Section: Introductionmentioning

confidence: 99%

Evaluation Model and Application of Shale Oil Production Efficiency Under Energy-Depleted Development Mode in Jimsar Sag

Gao

Zhi²,

et al. 2022

Front. Energy Res.

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In order to reveal the shale oil production mechanism and production efficiency under the energy-depleted development mode, experiments on expulsion oil based on imbibition and elastic energy release under high temperature and pressure were carried out, and nuclear magnetic resonance on-line monitoring was used to observe the production characteristics of shale oil. The experimental results show that the imbibition-expulsion oil mainly occurs in the small-size pore-throat system. Under the condition of high temperature and pressure, the oil-expulsion efficiency is generally less than 2% affected by pore pressure, which is significantly different from the conventional imbibition experiment results. Although elastic-energy expulsion oil occurs in different sizes of pore-throat systems, the oil-expulsion efficiency in large size pore-throat systems is more sensitive to temperature. Overall, the total elastic-energy oil-expulsion efficiency is significantly positively correlated with reservoir physical properties, production differential pressure and temperature, and negatively correlated with crude oil viscosity. Comprehensively considering various geological factors affecting oil-expulsion efficiency, the shale oil production efficiency evaluation model under the energy-depleted development mode is constructed, and the movable oil porosity of shale oil development section in the study area is evaluated. The results show that there is a good positive correlation between movable oil porosity and oil production intensity. The movable oil porosity of dry layer is generally lower than 0.5% and that of poor oil layer is between 0.5% and 1.5%. When the movable oil porosity is between 1.5 and 2.5%, it can be determined as the type II oil layer, and for more than 2.5%, it is the type I oil layer. The single-well evaluation results show that the shale oil “sweet spots” of the Lucaogou Formation in Jimsar Sag are mainly distributed in P2l22−1∼ P2l22−3 and P2l12−1∼ P2l12−3, which is in good agreement with the current development status.

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Crude oil mobility and its controlling factors in tight sand reservoirs in northern Songliao Basin, East China

Cited by 10 publications

References 15 publications

Late Cretaceous stratigraphic division in the northwestern Songliao Basin, Northeast China: Evidence from palaeontology and palaeomagnetism

Late Cretaceous stratigraphic division in the northwestern Songliao Basin, Northeast China: Evidence from palaeontology and palaeomagnetism

Rock Fabric of Tight Sandstone and Its Influence on Irreducible Water Saturation in Eastern Ordos Basin

Evaluation Model and Application of Shale Oil Production Efficiency Under Energy-Depleted Development Mode in Jimsar Sag

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