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Trend judgment of abandoned channels and fine architecture characterization in meandering river reservoirs: A case study of Neogene Minhuazhen Formation NmⅢ2 layer in Shijiutuo bulge, Chengning uplift, Bohai Bay Basin, East China

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Petroleum Exploration and Development 2019年第5期46卷 943-953页

作者： NIU Bo ZHAO Jiahong FU Ping LI Junjian BAO Zhidong HU Yong SU Jinchang GAO Xingjun ZHANG Chi YU Dengfei ZANG Dongsheng LI Min College of Geosciences China University of PetroleumBeijing 102249China Research Institute of Exploration and Development PetroChina Jilin Oilfield CompanySongyuan 138001China No.5 Oil Production Plant PetroChina Changqing Oilfield CompanyXi’an 710020China Bohai Oilfield Research Institute CNOOC Tianjin CompanyTianjin 300452China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China

Based on well logging responses,sedimentary patterns and sandstone thickness,the distribution characteristics of meandering river sedimentary sand body of Neogene Minghuazhen Formation NmⅢ2 layer in the west of Shijiutuo Bulge,Chengning Uplift,Bohai Bay Basin were investigated.A new approach to calculate the occurrence of the sand-mudstone interfaces using resistivity log of horizontal well was advanced to solve the multiple solution problem of abandoned channel’s orientation.This method uses the trigonometric function relationship between radius,dip and length of the resistivity log to calculate the occurrence qualitatively-quantitatively to help determine the true direction of the abandoned channels.This method can supplement and improve the architecture dissection technique for meandering river sandbodies.This method was used to study the dip angle and scale of the lateral accretion layers in point bar quantitatively to help determine the spatial distribution of lateral accretion layers.The fine architecture model of underground meandering river reservoir in the study area has been established.Different from traditional grids,different grid densities for lateral accretion layers and bodies were used in this model by non-uniform upscaling to establish the inner architecture model of point-bars and realize industrial numerical simulation of the whole study area.The research results can help us predict the distribution of remaining oil,tap remaining oil,and optimize the waterflooding in oilfields.

关键词： Bohai Bay Basin meandering river horizontal well resistivity curve lateral accretion layers lateral accretion bodies architecture modeling remaining oil distribution

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Scaling of the bubble/slug length of Taylor flow in a meandering microchannel

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Chinese Journal of Chemical Engineering 2019年第11期27卷 2615-2625页

作者： Qianqing Liang Xuehu Ma KaiWang Jiang Chun Zhong Lan TingtingHao Yaxiong Wang Liaoning Key Laboratory of Clean Utilization of Chemical Resources Institute of Chemical EngineeringDalian University of TechnologyDalian 11624China School of Chemical Engineering Inner Mongolia University of Science&TechnologyInner MongoliaBaotou 014010China

In order to reduce or avoid the fluctuations from interface breakup, a meandering microchannel with curved multi-bends(44 turns) is fabricated, and investigations of scaling bubble/slug length in Taylor flow in a rectangular meandering microchannel are systematically conducted. Based on considerable experimental data,quantitative analyses for the influences of two important characteristic times, liquid phase physical properties and aspect ratio are made on the prediction criteria for the bubble/slug length of Taylor flow in a meandering microchannel. A simple principle is suggested to predict the bubble formation period by using the information of Rayleigh time and capillary time for six gas–liquid systems with average deviation of 10.96%. Considering physical properties of the liquid phase and cross-section configuration of the rectangular mcirochannel,revised scaling laws for bubble length are established by introducing Ca, We, Re and W/h whether for the squeezing-driven or shearing-driven of bubble break. In addition, a simple principle in terms of Garstecki-type model and bubble formation period is set-up to predict slug lengths. A total of 107 sets of experimental data are correlated with the meandering microchannel and operating range: 0.001 b CaTPb 0.05, 0.06 b WeTPb 9.0,18 b ReTPb 460 using the bubble/slug length prediction equation from current work. The average deviation between the correlated data and the experimental data for bubble length and slug length is about 9.42% and9.95%, respectively.

关键词： meandering rectangular micro-channel T-junction Fluid properties Bubble breakup mode Bubble/slug length

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Models and Monte Carlo Simulations of the Mean Sinuosity of Major meandering Rivers

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Journal of Applied Mathematics and Physics 2022年第7期10卷 2368-2380页

作者： Pirooz Mohazzabi Qinghua Luo Department of Mathematics and Physics University of Wisconsin-Parkside Kenosha USA

The purpose of this research is to investigate the sinuosity of major rivers in the United States and the world, and to compare them to that predicted by the existing theories. It is shown that the average sinuosity of meandering rivers deviates considerably from what has been reported previously as π. Calculations of the mean value of actual sinuosities of major rivers in the United States and in the World show that this average is very close to 2. Exact models as well as a Monte Carlo simulation for meandering rivers that is based on Gaussian probability distribution function are also presented, and the possibility of composite meandering is discussed.

关键词： meandering River Sinuosity Simulation Gaussian

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Formation Mechanism and Sedimentary Pattern of Abandoned Channels

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Acta Geologica Sinica(English Edition) 2020年第2期94卷 545-555页

作者： LIU Zongbao SHANG Yunzhi ZHAO Rongsheng LIU Fang XUE Xinyu LIU Yunyan Northeast Petroleum University DaqingHeilongjiang 163318China Daqing Oilfield Limited Liability Company DaqingHeilongjiang 163514China Jilin University Changchun 130061China

Accurately identifying and quantitatively describing abandoned channels in meandering rivers are of great significance for improving hydrocarbon recovery. By using modern deposition analogy, field outcrop analysis, a dense well spacing, core observations and a review of the literature, this paper studied the formation process and space–time amalgamation of abandoned channels in meandering river. The results reveal that formation mechanisms of abandoned channels include chute cutoff patterns(shoal-cutting, ditch-scouring and embayment-eroding patterns) and neck cutoff patterns. The chute cutoff pattern forms a gradually abandoned channel, while the neck cutoff pattern forms a suddenly abandoned channel. From upstream to downstream, the sedimentary pattern of the abandoned channel transforms from a chute cutoff pattern to a neck cutoff pattern, where the main controlling factors transition from the grain size and gradient to the flow and vegetation. An abandoned channel formed by a chute cutoff pattern consists mainly of siltstone, fine sandstone and thin gravel layers, which form a lithological-physical barrier. The abandoned channel formed by a neck cutoff pattern consists mainly of mudstone and argillaceous siltstone, forming a lithological barrier. Based on the amalgamation and structure of the reservoir architectural elements, the abandoned channel can be divided into three planar sedimentary patterns(crescent, semilune and horseshoe) for a single channel and five vertical sedimentary patterns for composite channels.

关键词： abandoned channel cutoff pattern formation mechanism sedimentary pattern meandering river

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Hierarchy modeling of subsurface palaeochannel reservoir architecture

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Science China Earth Sciences 2008年第S2期51卷 126-137页

作者： WU ShengHe1,YUE DaLi1,LIU JianMin2,SHU QingLin2,FAN Zheng1,3 & LI YuPeng1 1 Earth Sciences and Geoinformatics School,China University of Petroleum,Beijing 102249,China 2 SINOPEC Shengli Oilfield Co. Ltd.,Dongying 257000,China 3 Beijing Telon High-tech Corporation,Beijing 100085,China Earth Sciences and Geoinformatics School China University of Petroleum Beijing China SINOPEC Shengli Oilfield Co. Ltd. Dongying China Beijing Telon High-tech Corporation Beijing China

The studies on fluvial reservoir architecture are mainly aimed at outcrop and modern deposition,but rarely at the subsurface reservoir,so there are few effective methods to predict the distribution of subsurface reservoir architectures. In this paper,taking the meandering river reservoir of Guantao formation Gudao Oilfield,Jiyang depression,Baohai Gulf Basin,East China as an example,the archi-tectural modeling method of complex meandering belt reservoir is proposed,that is hierarchy con-straint,pattern fitting and multi-dimensional interaction. Architectures of meandering river reservoir can be divided into three hierarchies: meandering channel sandbody,point bar and lateral accretion body. Different hierarchies of the quantitative architecture pattern are fitted to subsurface well data (including dynamic monitoring data) in different hierarchies through one-dimensional hole,2D profiles and plane and 3D space,which are verified by each other. And then 3D model in different hierarchies is established. At the same time,the quantificational relationship between width of active river and the scale of point bar is set up,and the scale of lateral accretion sand body and shale beddings is con-firmed with horizontal well data. The study not only has significant meaning on the development of geology,but also can improve the oilfield exploitation greatly.

关键词： reservoir architecture hierarchical modeling meandering river point bar lateral accretion body

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Sedimentary Facies, Sequence Stratigraphic Patterns in Pre-Cenozoic Inland Compressional Basin: Example from Early Yanshanian Succession of Eastern Yihezhuang Salient, Jiyang Depression, Bohai Bay Basin, China

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Journal of Earth Science 2019年第1期30卷 194-205页

作者： Guangzeng Song Hua Wang Meng Xu Jinda Xu Guoqing Sang School of Resources and Environment University of Jinan Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals Shandong University of Science and Technology Faculty of Earth Resources China University of Geosciences No.1 Institute of Geology and Mineral Resources of Shandong Province Geological Surveying & Mapping Institute of Shandong Province

To improve the success rate of locating hydrocarbon reservoirs in pre-Cenozoic inland compressional basins, taking the Early Yanshanian succession of eastern Yihezhuang salient as an example, this paper studied the sedimentary facies and sequence stratigraphic patterns. First, through seismic profiles, well logs, cores and outcrops, the sequence framework was established and internal sedimentary facies were identified. Further, according to analysis of single-wells and connecting-wells, the vertical evolution and horizontal distribution of sedimentation inside the sequence frameworks were discussed. The following results were acquired:(1) meandering river characterized by dual structures superposing each other was developed, and the dual structures can be further divided into three kinds;(2) the entire Early Yanshanian succession was interpreted as one first-order sequence, composed of three third-order sequences, including SQ-Fz1, SQ-Fz2 and SQ-St from bottom to top. Each third-order sequence can be further divided into three system tracts;(3) in different system tracts, different types of dual structures developed separately, and sedimentary bodies showed different horizontal distribution scales and vertical superposition patterns. Finally, the model of sequence stratigraphic patterns was established. This study enhanced the use of sequence stratigraphy to inland tectonically active basins, and would be helpful to predict reservoirs in pre-Cenozoic residual basins.

关键词： Early Yanshanian succession sequence stratigraphic patterns inland compressional basin meandering river dual structure

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Morphometric Assessment of meandering River in Arid Region Using Improvement Model (Case Study: Maroon River)

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Journal of Water Resource and Protection 2017年第4期9卷 358-377页

作者： Mehran Maghsoudi Seyyed Mohammad Zamanzadeh Mojtaba Yamani Abdolhossein Hajizadeh Geomorphology Tehran University University of Tehran Iran

To understand the natural environments of drylands, deserts, arid and semi-arid regions of the earth is to understand the processes and forms of their rivers. One of the river studies and fluvial processes are morphometry analyses. The channel forms in an alluvial plain reflecting the movement of water and the particle size of the load flowing down the channel. The dynamics of channel change has led to conflict with human resource development. Three basic channel patterns are detected in the region. They are braided, meandering and straight. In this research for assessment of meandering Maroon River, we used DEM (Digital Elevation System), Topography maps, Arc GIS software, Google earth, field work and library studies and mathematic formula. The two general indices for analyzing meandering patterns are 1) sinuosity coefficient 2) central angle. In this paper, the authors were used these factors and improved them. One of the results is creation of direction index and the second result is the Maroon River which has a type of sinuosity in any reach.

关键词： Iran Maroon River meandering Rivers Sinuosity Coefficient Central Angle Direction Index Behbahan Plain

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VARIATION OF WATER DEPTH AND MANNING'S ROUGHNESS n DUE TO RIVER meandering IN SUBCRITICAL FLOW REGIME

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International Journal of Sediment Research 2001年第1期16卷 69-79页

作者： Chin-Kun HUANG and Chang-Ling LIU Assistant professor, Department of Hydraulics & Ocean Engineering, National Cheng Kung University, Tainan,70101, Taiwan, China Professor, Department of Hydraulics & Ocean Engineering, National Cheng Kung University, Tai Department of Hydraulics & Ocean Engineering National Cheng Kung University Tainan70101 Taiwan China Department of Hydraulics & Ocean Engineering National Cheng Kung University Tainan 70101Taiwan China

This paper aims to study the variation of water depth H and Manning’s n due to the meandering of a river. It is found from experimental results that the increase in H and n is related to the sinuosities and the Froude numbers measured in the straight reach. In this study, the channel form is generated from sine-generated curve with ten different sinuosities. The results of this analysis can be applied to both cases of fixed bed and mobile bed.

关键词： Water depth Manning’s roughness meandering

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STUDY OF MORPHOLOGICAL CHANGE OF THE KUSHIYARA AND MONU RIVERS BY REMOTE SENSING

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International Journal of Sediment Research 2007年第2期22卷 160-168页

作者： M.J.B.ALAM R. ALAM M.UDDIN T. NAHAR Department of Civil and Environmental Engineering Shahjalal University of Science and Technology SylhetBangladesh

The Kushiyara and Monu rivers are two of the major river systems in the northeast region of Bangladesh. Analyzing satellite images of the Kushiyara and Monu rivers between 1990 and 1997, it was found that significant changes occurred at five distinct locations; i.e., Ahmadpur, Monumukh, Raysrr, Kaprangibari and Telibil. The amount of change was measured as 168.34 ha by using a plani-meter. Transportation of sediment was the major contributing factor of morphological change. The total average sediment concentration of Kushiyara and Monu rivers was found to be 16889.6 ppm per year during the study period by applying the Engelund and Hansen equation approach. Protection work has been suggested at the vulnerable locations.

关键词： meandering Remote sensing Sediment transport Morphological changes River protection

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Secondary Current and Classification of River Channels

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Applied Mathematics 2013年第1期4卷 70-78页

作者： Kaguchwa John Njenga Kwanza Jackson Kioko Gathia Patricia Wanjiru Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya Mathematics Department Egerton University Egerton Kenya

In this research, the secondary current theory is used in investigating the role of phase shift angle between the secondary current and the channel axis displacement in stability analysis of a river channel. To achieve this, a small-perturbation stability analysis is developed for investigation of the role of the secondary current accompanying channel curvature in the initiation and early development of meanders in open channels. The secondary currents are generating in planes perpendicular to the primary direction of motion. The secondary currents form a helical motion in which the water in the upper part of the river is driven outward, whereas the water near the bottom is driven inward in a bend. Force-momentum equations for longitudinal and transverse direction in open channel bends were utilized. Assuming that the transverse force contributed by the bed is negligible, the pressure force associated with the transverse surface inclination is balanced by the centripetal force. Existing equations of the transverse velocity profile were analyzed. Since the magnitude of the vertical velocity is negligible compared to the transverse velocity in secondary currents, this study concentrates on the transverse velocity which is the radial component of the secondary current. This formulation leads to a linear differential equation which is solved for its orthogonal components which give the rates of meander growth and downstream migration. It is shown that instability increases with decrease in phase shift angle. Transition from straight to meandering and then from meandering to braiding occurs when phase shift angle is reduced.

关键词： Secondary Flow Phase Shift meandering Braiding Stability

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