Pore size distribution and reservoir characterization: evaluation for the Eocene beach-bar sequence, Dongying Depression, China

Zahid, Muhammad Aleem; Dong, Changyin; Golab, Alexandra; Chen, Lin; Zhang, Xianguo; Ge, Xin; Wu, Songtao; Munawar, Muhammad Jawad; Ma, Cunfei; Knuefing, Lydia

doi:10.1007/s12517-019-4772-7

Cited by 4 publications

(1 citation statement)

References 57 publications

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“…It often occurs in patches, but it will decrease in the late stage of water flooding. The difference in the radius of the pore and throat of the ultra-low-permeability reservoir causes the finger-like sweeping of injection water, and the clustered residual oil is left behind (Zahid M. A. et al, 2020) [30]. The oil often exists in smaller pores and throats or in large pores surrounded by small throats.…”

Section: Microscopic Residual Oil Typesmentioning

confidence: 99%

Microscopic Distribution and Development Strategy of Residual Oil in Tight Sandstone

Zhang

Mu³

2023

Processes

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Pore and permeability are distributed discontinuously and unevenly in the dominant sedimentary model of the lateral accretion body inside the meandering river point bar of the Fuyang reservoir of the Yushulin oilfield. Based on the water flooding experiments of field core samples, the influence of pore permeability conditions on residual oil distribution type and water cutting rate was studied by using the microscopic visualization technology enabled through a photolithographically fabricated glass model. It is found that the residual oil in samples shows five discontinuous types, which are cluster, columnar, oil droplet, membrane, and blind end. In the stages with low, medium, and high water cutting rates, the proportion of clustered residual oil in the samples with different permeability is high, reflecting the situation that it is difficult for injected water to spread widely in tight oil reservoirs. With the decrease of permeability, the proportion of membrane and blind end residual oil gradually increases, which indicates that the thin pore throat can produce large restrictions on residual oil, resulting in residual oil enrichment. At the same time, the water flooding experiment was carried out by changing the displacement direction and periodic water injection. It was found that changing the displacement direction was beneficial to the recovery of residual oil in the thin pore throat and avoided the dominant seepage of injected water in the big pore throat, and the recovery rate was increased by more than 2.14%. Periodic water injection, which was conducive to adjusting the displacement pressure difference, reduced the constraining force of the throat on residual oil and increased the recovery rate by more than 3.98%. The actual well area with closed coring wells and dynamic production data is preferred for the application of experimental research results. Changing displacement direction and periodic water injection increased the residual oil recovery by more than 3%.

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Section: Microscopic Residual Oil Typesmentioning

confidence: 99%

Microscopic Distribution and Development Strategy of Residual Oil in Tight Sandstone

Zhang

Mu³

2023

Processes

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Applications of nuclear magnetic resonance (NMR) logging in tight sandstone reservoir pore structure characterization

Zhang

Guo

et al. 2020

Arab J Geosci

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Impact of Pulse Plasma-Based Shockwave Technology on Sandstone Porosity and Pore Connectivity Using Ultrasonic Compressional Wave Velocity and Microtomography

Maddirala,

Shukla,

Pramanik

et al. 2024

Energy Fuels

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The pulse plasma-based shockwave (PPBSW) technology has become very noticeable across many areas, such as the food, mining, and oil and gas industries. The present study deals with the impact of PPBSW on the pore network and connectivity of rock samples generated through the developed tool. It also provides detailed insight regarding the pore structure using micro-CT analysis. The study was performed on Indian sandstone and Berea sandstone samples under a set confining pressure using the suitable dimensions of the fabricated tool, enabling rapid deployment inside the well. This may assist in deciding the role of this technology in various oil field operations affecting hydrocarbon recovery. Core samples were characterized by mineral content, ultrasonic velocities, physical appearance, and microstructural evaluation before exposure to PPBSW. Core samples were subjected to varying shockwave pulses. Postexposure rock samples were analyzed by using ultrasonic measurements and microstructure evaluation. The results revealed that these shockwave pulses significantly impacted various parameters, such as porosity, ultrasonic velocities, physical appearance, and the microstructure of exposed core samples. The damage factor/coefficient of rocks was affected after the exposure. It was noticed that the impact increased as the number of pulses increased. The physical appearance of the field samples after the exposure revealed that, as the number of pulses increased, the chipping of the matrix, the creation of new voids, and the connectivity of pore space also increased, whereas micro-CT scans of the Berea sandstone samples revealed that porosity and connectivity between the pores were increased as the number of pulses was increased. One of the field samples was exposed to 100 pulses during which fractures were developed. In the presence of natural fractures in the rock, the creation of microfractures could easily connect to them. It may increase the permeability, eventually creating better fluid flow through porous layers and increasing hydrocarbon recovery. Thus, this technology is more suitable for creating voids and microfractures near the wellbore.

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Pore size distribution and reservoir characterization: evaluation for the Eocene beach-bar sequence, Dongying Depression, China

Cited by 4 publications

References 57 publications

Microscopic Distribution and Development Strategy of Residual Oil in Tight Sandstone

Microscopic Distribution and Development Strategy of Residual Oil in Tight Sandstone

Applications of nuclear magnetic resonance (NMR) logging in tight sandstone reservoir pore structure characterization

Impact of Pulse Plasma-Based Shockwave Technology on Sandstone Porosity and Pore Connectivity Using Ultrasonic Compressional Wave Velocity and Microtomography

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