Sandbody architecture analysis of braided river reservoirs and their significance for remaining oil distribution: A case study based on a new outcrop in the Songliao Basin, Northeast China

Zang, Dongsheng; Bao, Zhidong; Li, Mingyi; Fu, Ping; Li, Min; Niu, Bo; Li, Zhuolun; Zhang, Li; Wei, Mingyang; Dou, Luxing; Xu, Xiting

doi:10.1177/0144598720951280

Cited by 14 publications

(5 citation statements)

References 26 publications

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“…Excessive pre-fluid will overextend the fracture length and narrow the fracture width, thus reducing the proppant laying concentration. Large amounts of fracturing fluid leaching into the formation can cause damage to the formation (Santosh and Feng, 2020;Zang et al, 2020;Wang and Wang, 2021). If the amount of pre-fluid is too small, the fracture length cannot meet the design requirements, and sand plugging may occur, resulting in economic losses.…”

Section: Engineering Factors and Fracturing Effectsmentioning

confidence: 99%

Simulation of Fracturing and Well Pattern Optimization of Fractured Tight Sandstone Reservoirs

et al. 2022

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The fracturing and well pattern optimization of fractured reservoirs is a hot spot in petroleum engineering. In this study, taking the tight oil reservoirs of the Yanchang Formation in the Ordos Basin as an example, an optimized plan of hydraulic fracturing and well pattern deployment of the fractured tight reservoir were systematically studied using a fluid-solid coupling model. The results show that the Chang 6 Member of Yanchang Formation mainly develop feldspar sandstone. A large number of vertical fractures are developed in Chang 6 Member, and they have significant shearing properties. The target sandstone reservoir is in the mid-diagenetic A stage. Natural fractures have a significant effect on the extension of hydraulic fractures. When the fracturing direction is parallel to the main strike of natural fractures, the extension distance of the hydraulic fractures is long and the fracturing scale is large; however, when the fracturing direction is orthogonal or oblique to the main strike of natural fractures, the extension distance of the hydraulic fractures is limited. Statistics show that the average length of hydraulic fractures when fracturing parallel to natural fractures is 1.3 times of that when fracturing perpendicular to natural fractures. In addition, after optimization of fracturing parameters, we found that the displacement should be controlled at 2–3 cubic meters/min, and the sand ratio should be controlled at 25%. The smaller the horizontal minimum principal stress difference between the fracturing layer and the shielding layer, the lower the elastic modulus, and the easier it is to control the fracture height. Microseismic monitoring results show that the half-fracture length and fracture height are mainly distributed in 80–140 m and 15–25 m, respectively. The optimized fracture half-length was 120 m and the half-fracture height was 20 m. Finally, the well pattern of the target layer is optimized considering natural fractures. Through this study, we found that the reverse five-spot well pattern is suitable for the efficient development of tight oil reservoirs of the Chang 6 Member in this area.

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Section: Engineering Factors and Fracturing Effectsmentioning

confidence: 99%

Simulation of Fracturing and Well Pattern Optimization of Fractured Tight Sandstone Reservoirs

et al. 2022

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“…Architectural element analysis of the fluvial and fluvio-deltaic transitional sedimentary sequences has been studied by different researchers around the world during the last few years [1][2][3][4]. Field studies, outcrop analysis, and section measurement have been considered of prime importance in the study of architectural element analysis.…”

Section: Introductionmentioning

confidence: 99%

“…Field studies, outcrop analysis, and section measurement have been considered of prime importance in the study of architectural element analysis. Due to a series of cyclic depositional events, lateral and vertical facies migration, and the superposition of depositional units, the study of architectural element analysis has always been exceedingly difficult [4]. Facies description and sedimentary architecture elements are well studied throughout the world in different sedimentary basins.…”

Section: Introductionmentioning

confidence: 99%

Sedimentary Facies, Architectural Elements, and Depositional Environments of the Maastrichtian Pab Formation in the Rakhi Gorge, Eastern Sulaiman Ranges, Pakistan

Mehmood

Naseem

Saleem

et al. 2023

JMSE

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An integrated study of sediments was conducted to examine the facies architecture and depositional environment of the Cretaceous Pab Formation, Rakhi Gorge, and Suleiman Ranges, Pakistan. This research focused on analyzing architectural elements and facies, which are not commonly studied in sedimentary basins in Pakistan. To identify lithofacies, outcrop analysis and section measurement were performed. The identified lithofacies were then categorized based on their depositional characteristics and facies associations, with a total of nine types identified within a stratigraphic thickness of approximately 480 m. These facies were mainly indicative of high-energy environments, although the specifics varied by location. Sedimentary structures such as planar and trough crossbedding, lamination, nodularity, load-casts, and fossil traces were found within these facies, indicating high-energy environments with a few exceptions in calm environments. The identified facies were grouped into seven architectural elements according to their depositional environments: delta-dominated elements, including laminated shale sheet elements (LS), fine sandstone elements (SF), planar cross-bedded sandstone elements (SCp), trace sandstone elements (ST), and paleosol elements (Pa); and river-dominated elements, including trough cross-bedded sandstone elements (SCt), channel deposit elements (CH), and paleosol elements (Pa). These architectural elements, along with their vertical and lateral relationships, indicate a transitional fluvio-deltaic environment within the Pab Formation. In conclusion, by interpreting facies and architectural elements, it is possible to gain a better understanding of the depositional history of the formation and the distribution of reservoir units.

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“…The architectural structure of braided river reservoirs is still in the qualitative and quantitative exploration stage. Physical experiment simulation is a commonly used research method for river sedimentation, which is simple and not restricted by climate or season [23], but this method tends to be greatly influenced by human factors. Moreover, underground river sedimentation is a long historical process, while simulation based on sedimentation experiments is a short process, which means that the time scales of the two processes are asymmetric and cannot truly reflect the long reconstruction process of braided river reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Scale Analysis of the Channel Bar in a Braided River and Its Internal Architecture

Li,

2023

Applied Sciences

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This paper proposes a new research method for braided river sedimentation on the beach shore based on the action of tidal currents. This study conducts a statistical analysis of the length and width of a single braided river and channel bar sand body, and establishes the relationship function model of the quantitative scale of a single braided river and the channel bar. According to the core and logging data of the Nanwu area of the target oilfield, a quantitative methodology based on the calculation of a single accretion scale is established from three perspectives: the architecture interface identification of the accretion, the occurrence and scale calculation of the interlayer, and the scale calculation of the single accretion. In the Nanwu area, the inclination angle of the accretion interface in the direction of the long axis is 0.78–1.32°, and the inclination angle of the accretion interface in the direction of the short axis is 2.02–3.78°. The density of a single well group is generally 2–3 per well. The length of the single accretion in the channel bar is 700–1500 m. Based on these findings, this paper completes the construction of the architecture of the channel bar, and establishes the quantitative scale calculation method for architecture elements for different levels of braided river reservoirs. The research results provide support for the prediction of the braided river reservoir architecture and the remaining oil in similar blocks.

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Sandbody architecture analysis of braided river reservoirs and their significance for remaining oil distribution: A case study based on a new outcrop in the Songliao Basin, Northeast China

Cited by 14 publications

References 26 publications

Simulation of Fracturing and Well Pattern Optimization of Fractured Tight Sandstone Reservoirs

Simulation of Fracturing and Well Pattern Optimization of Fractured Tight Sandstone Reservoirs

Sedimentary Facies, Architectural Elements, and Depositional Environments of the Maastrichtian Pab Formation in the Rakhi Gorge, Eastern Sulaiman Ranges, Pakistan

Quantitative Scale Analysis of the Channel Bar in a Braided River and Its Internal Architecture

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