Effect of burial processes on the evolution of organic acids and implications for acidic dissolution from a case study of the Nanpu Sag, Bohai Bay Basin, China

Liang, Chao; Zhang, Liang; Zhang, Liang; Jia, Haibo; Zhu, Yifei; Fang, Zheng

doi:10.1016/j.jngse.2017.01.020

Cited by 21 publications

(9 citation statements)

References 11 publications

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“…Location map of the Nanpu Sag in Bohai Bay Basin (A) within China (B) and the structural belts of Nanpu Sag (C) of the Nanpu Sag 1,2,30 stress state is important for wellbore stability and oil recovery enhancement. [16][17][18] The oriented and high-resolution image logs are the principle specialized tools for fracture detection and present-day stress evaluation.…”

Section: F I G U R Ementioning

confidence: 99%

“…[28][29][30][31] The Nanpu Sag is a typical dustpan-shaped faulted sag ( Figure 1). 1,30,32,33 The Nanpu Sag experienced a rifting stage during the Paleogene and then a postrifting stage since Neogene. 1,2 The Nanpu Sag contains many northwestern to nearly east-west faults.…”

Section: Geologic Settingsmentioning

confidence: 99%

“…1,30,32,33 The Nanpu Sag experienced a rifting stage during the Paleogene and then a postrifting stage since Neogene. 1,2 The Nanpu Sag contains many northwestern to nearly east-west faults. 32 Eight structural units including the Nanpu No.1 to No.5 structural belts, Beipu, Gaoliu, and Laoyemiao oilfields are divided in the Nanpu Sag ( Figure 1).…”

Section: Geologic Settingsmentioning

confidence: 99%

“…32 Eight structural units including the Nanpu No.1 to No.5 structural belts, Beipu, Gaoliu, and Laoyemiao oilfields are divided in the Nanpu Sag ( Figure 1). 1,30,34,35 The Cenozoic stratigraphic units in the Nanpu Sag include the Eocene Kongdian (Ek), Paleogene Shahejie (Es), Paleogene Dongying (Ed), Miocene Guantao (Ng), Minghuazhen (Nm), and the Quaternary Pingyuan Formation (Qp) ( Figure 1). 25,27,33,36 The Dongying Formation is in unconformable contact with the underlying Shahejie Formation.…”

Section: Geologic Settingsmentioning

confidence: 99%

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In‐situ stress determination and fracture characterization using image logs: The Paleogene Dongying Formation in Nanpu Sag, Bohai Bay Basin, China

Niu

Liu

Lai

et al. 2019

Energy Science & Engineering

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Fracture detection and in‐situ stress determination via well logs are important for exploration and exploitation of subsurface hydrocarbons. Cores, thin sections, and image logs are used to describe and interpret the subsurface fractures and in‐situ stress in the Paleogene Dongying sandstones in Nanpu Sag, Bohai Bay Basin, China. The maximum horizontal stress (SHmax) indicates a nearly east‐west trend according to the borehole breakouts and drilling‐induced fractures. Natural fractures in the Dongying sandstones are classified into: (1) open fractures and (2) closed fractures. The cement‐filled (closed) fractures are commonly detected by image logs as bright discontinuous sinusoidal waves due to resistive filling materials, while the open fractures are evident on image logs appearing as dark sine waves. The open fractures are of dominantly high dip angles, and the rose diagrams confirm the presences of two sets of fractures: northwest‐southeast and northwest‐southeast orientation. Fractures with strikes approximately parallel to the SHmax have good connectedness, making a significant contribution in hydrocarbon production. In addition, the oil‐bearing layers are mainly associated with the intervals with open fractures. The presence of natural fractures provides important pore spaces and fluid flow conduits. Insights can be provided into the subsurface fracture (natural and induced) detection and characterization using image logs.

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Section: F I G U R Ementioning

confidence: 99%

Section: Geologic Settingsmentioning

confidence: 99%

Section: Geologic Settingsmentioning

confidence: 99%

Section: Geologic Settingsmentioning

confidence: 99%

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In‐situ stress determination and fracture characterization using image logs: The Paleogene Dongying Formation in Nanpu Sag, Bohai Bay Basin, China

Niu

Liu

Lai

et al. 2019

Energy Science & Engineering

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“…Location map of the structural belt, associated bulges and structural division of Nanpu Sag, Bohai Bay Basin, China Modified afterChen et al (2017) …”

mentioning

confidence: 99%

Pore size distribution, their geometry and connectivity in deeply buried Paleogene Es1 sandstone reservoir, Nanpu Sag, East China

et al. 2019

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The study of pore characteristics is of great importance in reservoir evaluation, especially in deeply buried sandstone. It controls the storage mechanism and reservoir fluid properties of the permeable horizons. The first member of Eocene Shahejie Formation (Es1) sandstone is classified as feldspathic litharenite and lithic arkose. The present research investigates the pore characteristics and reservoir features of the deeply buried sandstone reservoir of Es1 member of Shahejie Formation. The techniques including thin-section petrography, mercury injection capillary pressure (MICP), scanning electron microscopy and laser scanning confocal microscope images were used to demarcate the pores including primary intergranular pores and secondary intergranular, intragranular, dissolution and fracture pores. Mercury injection test and routine core analysis were led to demarcate the pore network characteristics of the studied reservoir. Pore size and pore throat size distribution are acquired from mercury injection test. Porosity values range from 0.5% to 30%, and permeability ranges 0.006-7000 mD. Pore radii of coarse-grained sandstone and fine-grained sandstone range from 0.2 to > 4 µm and 1 nm to 1.60 µm, respectively, by MICP analysis. The mineral composition also plays an important role in protecting the pores with pressure from failure. Fractured sandstone and coarse-grained sandstone consist of large and interconnected pores that enhance the reservoir porosity and permeability, whereas fine-grained sandstone and siltstone consist of numerous pores but not well interconnected, and so they consist of high porosity with low permeability.

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Role of bedding planes played in enhancing dissolution in sandstones

et al. 2022

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Effect of burial processes on the evolution of organic acids and implications for acidic dissolution from a case study of the Nanpu Sag, Bohai Bay Basin, China

Cited by 21 publications

References 11 publications

In‐situ stress determination and fracture characterization using image logs: The Paleogene Dongying Formation in Nanpu Sag, Bohai Bay Basin, China

In‐situ stress determination and fracture characterization using image logs: The Paleogene Dongying Formation in Nanpu Sag, Bohai Bay Basin, China

Pore size distribution, their geometry and connectivity in deeply buried Paleogene Es1 sandstone reservoir, Nanpu Sag, East China

Role of bedding planes played in enhancing dissolution in sandstones

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