A Study on the Lateral Accretion Body Potential Tapping of the Point Bar

2013 ◽  
Vol 838-841 ◽  
pp. 863-866
Author(s):  
Hong Zhao
Keyword(s):  
Horizontal Wells ◽  
River Sand ◽  
Point Bar ◽  
Meandering River ◽  
Oil Distribution ◽  
Abandoned Channel ◽  
Sand Body ◽  
Remaining Oil ◽  
Body Potential ◽  
Oilfield Development

The channel sand in PI3132 units of A area in Daqing oilfield is meandering river sand body. Although more than 90 percent of it is watering out, the serious heterogeneity in layers make it possible that there are plenty of remaining reserves in unwashed or low-washed segments in water flooded layers. All these two kinds of remaining oil are the main potential tapping objectives in later period of oilfield development.The writer deeply analyzed the point bar sand body of the meandering river, established the recognizing method of the abandoned channel and the lateral accretion body of point bar, understood the remaining oil distribution in the washed segments and unwashed segments of the thick oil layers. By implementing the Personalized treatments for individual wells,such as super-short radius horizontal wells drilling,waterflood depth profile controlling,cyclic injecting and producing, etc, the point bar sand body potential tapping technology for different formation cause has been established. And this has essential meaning to direct the oilfield development.

Sedimentary characteristics and sand body distributions in the Lower Permian He 8 member, Ordos Basin, China

2021 ◽  
pp. 1-50
Author(s):  
Zhiyuan Lu ◽  
Zhiliang He ◽  
Shizhong Ma ◽  
Yu He
Keyword(s):  
Ordos Basin ◽  
Lower Permian ◽  
Braided River ◽  
River Sand ◽  
Meandering River ◽  
Sedimentary Characteristics ◽  
Fluvial Deposits ◽  
Sand Body ◽  
The Ordos Basin ◽  
Sand Bodies

The Lower Permian He 8 Member (P1h8) in the Ordos Basin is a typical producing zone of tight lithologic gas reservoirs. Analyses of sedimentary characteristics, electrofacies, and sand-body distributions of P1h8, conducted on modern fluvial deposits, outcrops, cores, and well logs, revealed that braided rivers that developed in the Lower P1h8 and Upper P1h8 are characterized by meandering river. Within these fluvial deposits, the procedure consists of analyzing high-resolution sequence stratigraphy and sedimentary dynamics defined from calibrated logging curve signatures and depositional studies. According to modern and ancient fluvial deposits, we have developed a process-based sedimentary conceptual model for interpreting and predicting the distribution and geometries of sand bodies in braided and meandering deposits. The main sand body of the braided river system was bars and channel fill deposits. The braided river sand bodies are distributed over multiple vertical superimpositions and overlapping horizontal connections. The meandering river sand bodies are mainly point-bar deposits, which are bead-shaped and exhibit scattered development in the vertical direction. This comparison indicates that there were significant differences between braided and meandering deposystems. The sand bodies in the Lower P1h8 were multidirectionally connected and primarily distributed in a stacked pattern. In contrast, the sand bodies in the Upper P1h8 were distributed in an isolated manner, and fine grains (mud and silt) were deposited between the sand bodies with poor connectivity. We interpreted the fluvial deposits that control the distributions of the sand body of the He8 Member in the eastern Sulige gas field and constructed a corresponding prediction model of a braided-meandering reservoir. This model will promote understanding of the extent of fluvial deposits and sand-body distribution of P1h8, thus elucidating hydrocarbon-bearing sand units of the Ordos Basin for future exploration.

scholarly journals Flow Unit Model of Channel Sand Body and Its Effect on Remnant Oil Distribution: A Case Study of PI Formation in the Eastern Transition Zone of Daqing Oilfield

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-20
Author(s):  
Yue Zhang ◽  
You-liang Ji ◽  
Hui-jian Wen ◽  
Shi-zhong Ma ◽  
Dong-lai Bai ◽  
...  
Keyword(s):  
Narrow Channel ◽  
Flow Unit ◽  
Free State ◽  
Weak Current ◽  
Point Bar ◽  
Flow Units ◽  
Oil Distribution ◽  
Strong Current ◽  
Sand Body ◽  
Current Limiting

To analyze the effect of various flow units in a channel sand body on remnant oil, we established a connection between various flow unit types and the remnant oil distribution. Using stratigraphic correlation and the characterization of sedimentary microfacies, we describe a single sand body, point bar, and narrow channel located at the injection-production well pattern of well B2-60-FB271 in the Eastern transition zone of the Daqing Placanticline. Architecture models of the point bar and narrow channel are also established using a series of parameters from different measurement methods. Four types of flow units (strong-current limiting, medium-current limiting, weak-current limiting, and none-current limiting) in the point bar sand body were identified, whereas one type, unshielded unit, was identified in the narrow channel. Geological parameters, such as porosity, permeability, and pore-throat radius (r50), were optimized to quantitatively characterize these various flow units. Samples were obtained from well B2-60-FB271 and analyzed by the freeze-fluorescence thin section technique. According to the displacement degree, the microscopic remnant oil was divided into three types: (1) free-state remnant oil, (2) semi-free-state remnant oil, and (3) bound-state remnant oil. We found that the strong-current limiting flow unit in the point bar is the enrichment area of free-state microscopic remnant oil and that the medium-current limiting and weak-current limiting flow units also have relatively high free microscopic remnant oil. These constitute the remaining oil enrichment areas in the study area.

Remaining Oil Distribution and Development of Chao64 Block in Chaoyanggou Oilfield

2014 ◽  
Vol 522-524 ◽  
pp. 1262-1265
Author(s):  
Qi Xu
Keyword(s):  
High Water ◽  
High Position ◽  
Control Factors ◽  
Oil Distribution ◽  
Body Development ◽  
Sand Body ◽  
Remaining Oil ◽  
High Water Cut ◽  
Water Cut ◽  
High Structure

Effective comprehensive logging, seismic fine prediction of structure and sand body, analysis of remaining oil controlling factors and distribution, is the precondition for remaining oil development in high water cut oilfield during the middle and later periods of the development. Based on combination of fine well and seismic fine structure and sand body prediction research, this article analyzes main control factors and distribution regularity of remaining oil in the block. Through the analysis, the structure and reservoir heterogeneity affected the distribution of remaining oil in the Fuyu oil layer in the Chao 64 block, the distribution of remaining oil in the plane, interlayer and layer showed different distribution characteristic. The remaining oil mainly distributed in the reverse faulting footwall high structure position, injection production faultiness part, and micro range structural high position, inter well isolated sand body development area.

Study of the Fluvial Facies Reservoir Sedimentary Characteristics of an Oil Field in China

2013 ◽  
Vol 753-755 ◽  
pp. 66-69
Author(s):  
Sheng Yun Yu ◽  
Qing Yun Meng ◽  
Hai Ying Xu
Keyword(s):  
Sedimentary Environment ◽  
Sedimentary Facies ◽  
Flood Plain ◽  
Oil Field ◽  
Distribution Model ◽  
River Sand ◽  
Meandering River ◽  
Sedimentary Characteristics ◽  
Sedimentary Model ◽  
Sand Body

In this paper, 6 kinds of reservoir sedimentary microfacies distribution model-conceptual model have been established by the use of reservoir sedimentology theory and methods, namely, large sandy braided river sand body sedimentary model, large meandering river sand body sedimentary model, low bending-straight distributary channel sedimentary model, crevasse splay (crevasse river) sedimentary model, heart beach sedimentary model, flood plain and distributary plain sheet sand body sedimentary model. On this basis, the sedimentary facies figures of four sedimentary units have been painted, putting forward the evolution law of sedimentary environment in the research zone, thus providing basic data for the facies control modeling.

Research on Sedimentary Facies of Formation of Neogene in Oilfield

2013 ◽  
Vol 340 ◽  
pp. 920-923
Author(s):  
Xiang Xing ◽  
Feng Cai ◽  
Wang Shui Hu
Keyword(s):  
Sedimentary Facies ◽  
Oil Field ◽  
North West ◽  
Meandering River ◽  
Body Distribution ◽  
Abandoned Channel ◽  
Sand Body ◽  
Linear Reservoir ◽  
Channel Bottom ◽  
Core Characteristics

The paper studied the sedimentary system of No.1 and No.2 structure in Nanpu oil field with methods of geological, logging, seismic and chemical analysis, associated with core characteristics, sedimentary structure, profile structure and logging facies. The results demonstrate the following three points. First, Minghuazhen Formation in Nanpu field is meandering river sedimentary, and the channel subphase can be further divided into channel bottom lag deposits, beach, abandoned channel and natural levee. Second, the isopach and sedimentary face map of Minghuazhen Formation are generated based on each well's thickness of sand body and curve characteristics, and show the trend of North West and South West distribution. Third, sand body distribution can be predicted though spatial distribution of sedimentary face. And linear reservoir and Barrage-type reservoir are the two typical zones of Minghuazhen Formation.

Point Bar Numerical Simulation and Results Analysis of x-Unit in the Daqing Oilfield D Block

2013 ◽  
Vol 321-324 ◽  
pp. 890-893
Author(s):  
Dong Zhang ◽  
Bai Quan Yan ◽  
Er Shuang Gao
Keyword(s):  
Numerical Simulation ◽  
History Matching ◽  
Water Displacement ◽  
Injection Wells ◽  
Point Bar ◽  
Oil Saturation ◽  
Splitting Factor ◽  
Remaining Oil ◽  
Oil Water ◽  
Oilfield Development

Point bar reservoir is the key development object in the late stage of oilfield development at present. In this paper, numerical simulation is done on the basis of the point bar architecture in the modeling of the point bar. Through dynamic data generating simulated well history and acquiring X-unit splitting factor, history matching is done on this basis. The numerical simulation results reveal that oil saturation has belt distribution characteristics on the pane due to the lateral accretion interlayer affect to the oil-water displacement; injection wells transverse spread is limited by the lateral accretion interbed control; by lateral accretion interlayer updip pinchout control, the remaining oil is mainly located in the middle and upper part of the lateral accretion [1,2]. Because of the above characteristics, taking horizontal wells to develop the top remaining oil of point bar has been very good results. And it has been confirmed by the further results of the numerical simulation.

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