An application of high density seismic on narrow channel sand‐body description in dense well pattern zone

2011 ◽  
Author(s):  
Qi Jin‐cheng ◽  
Li Jie ◽  
Pang Yan‐ming
Keyword(s):  
Narrow Channel ◽  
High Density ◽  
Sand Body ◽  
Well Pattern

Integrated Solutions for the Redevelopment Plan of Offshore Mature-Oilfield

2021 ◽  
Author(s):  
Hongfu Shi ◽  
Yingxian Liu ◽  
Lifu Jiang ◽  
Jingding Zheng ◽  
Liqin Gan
Keyword(s):  
High Water ◽  
Bohai Bay ◽  
Sand Body ◽  
Well Pattern ◽  
Open Hole ◽  
Average Water ◽  
High Water Cut ◽  
Water Cut ◽  
Stream Lines ◽  
Sand Bodies

Abstract Abundant faults, long oil-bearing intervals (up to 500m), and diverse fluids including conventional oil and heavy oil, result in P oilfield became one of the most complex oil fields in the Bohai Bay. The main characters ofinitial development plan are directional well with commingle production, open hole completion, large draw down, high oil production rate, and reverse nine-point well pattern. At present, the oilfield has entered a stage of high water cut, with average water cut more than 85%. What can we do next, decommissioning or rebirthing? An integrated solution was proposed to redevelop the oilfield which focus on the layers’ subdivision, the fine description of the sand body,a large number of horizontal wells on the top of the water-flooded layer are used to tap the potential, increase the water injector to transform the stream lines and rebuild the reservoir pressure, and search for potential sand bodies to increase reserves.

High-resolution seismic processing technique with broadband,wide-azimuth, and high-density seismic data - A case study of thin-sand reservoir in eastern China

2021 ◽  
pp. 1-45
Author(s):  
Qin Su ◽  
Huahui Zeng ◽  
Yancan Tian ◽  
HaiLiang Li ◽  
Lei Lyu ◽  
...  
Keyword(s):  
Seismic Data ◽  
Oil And Gas ◽  
Single Point ◽  
Eastern China ◽  
High Density ◽  
Songliao Basin ◽  
Seismic Processing ◽  
Oil And Gas Exploration ◽  
Sand Body

Seismic processing and interpretation techniques provide important tools for the oil and gas exploration of the Songliao Basin in eastern China, which is dominated by terrestrial facies. In the Songliao Basin, a large number of thin-sand reservoirs are widely distributed, which are the primary targets of potential oil and gas exploration and exploitation. An important job of the exploration in the Songliao Basin is to accurately describe the distribution of these thin-sand belts and the sand-body shapes. However, the thickness of these thin-sand reservoirs are generally below the resolution of the conventional seismic processing. Most of the reservoirs are thin-interbeds of sand and mudstones with strong vertical and lateral variations. This makes it difficult to accurately predict the vertical and horizontal distribution of the thin-sand bodies using the conventional seismic processing and interpretation methods. Additionally, these lithologic traps are difficult to identify due to the complex controlling factor and distribution characteristics, and strong concealment. These challenges motivate us to improve the seismic data quality to help delineate the thin-sand reservoirs. In this paper, we use the broadband, wide-azimuth, and high-density integrated seismic exploration technique to help delineate the thin-reservoirs. We first use field single-point excitation and single-point receiver acquisition to obtain seismic data with wide frequency-bands, wide-azimuth angles, and high folds, which contain rich geological information. Next, we perform the near-surface Q-compensation, viscoelastic prestack time migration, seismic attributes, and seismic waveform indication inversion on the new acquired seismic data. The 3D case study indicates the benefits of improving the imaging of thin-sand body and the accuracy of inversion and reservoir characterization using the method in this paper.

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.

scholarly journals Countermeasures to Decrease Water Cut and Increase Oil Recovery from High Water Cut, Narrow-Channel Reservoirs in Bohai Sea

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Gaocheng Feng ◽  
Yuhui Zhou ◽  
Weiying Yao ◽  
Lingtong Liu ◽  
Zhao Feng ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Bohai Sea ◽  
High Water ◽  
Narrow Channel ◽  
Optimization Strategy ◽  
Well Pattern ◽  
Remaining Oil ◽  
High Water Cut ◽  
Water Cut ◽  
Well Pattern Optimization

Most multilayer sandstone reservoirs in the Bohai Sea have already entered the middle or high water cut production stage with large amounts of remaining oil being scattered distributed. Therefore, there is an urgent need to find a suitable countermeasure to reduce water cut and increase oil recovery. In this study, taking the narrow-channel reservoirs in the M oilfield as an example, we qualitatively described the sand body scale and the contact relationships between different sand bodies, in addition to carefully analyzing the material base and remaining oil distribution characteristics. Accordingly, we proposed a countermeasure based on the injection-production structural adjustment to reduce water cut and increase oil recovery from high water cut, narrow-channel reservoirs. Herein, three optimization strategies were developed based on the proposed development mode: a seepage field optimization strategy was developed based on the quantified injection-production index; a well pattern optimization strategy for narrow-channel reservoirs was developed to overcome the production energy refueling problem; an injection-production measure optimization strategy was developed to tap the different types of remaining oil. Additionally, the well pattern optimization and injection-production optimization strategies were integrated to optimize and adjust the seepage field system. The findings reported herein this paper help understand the development of similar offshore oilfields with a high water cut.

An application of 3D seismic technology in tapping potential of remaining oil of narrow channel sand body in Saertu oil field

2016 ◽  
Author(s):  
Qi Jinchegng* ◽  
Chen Liyan ◽  
Li Hongxing ◽  
Zhou Huajian ◽  
Pang Chunhong
Keyword(s):  
Narrow Channel ◽  
Oil Field ◽  
3D Seismic ◽  
Sand Body ◽  
Remaining Oil

The Study on well Pattern Adaptability of Single Sand-Body

2013 ◽  
Vol 368-370 ◽  
pp. 1821-1825
Author(s):  
Li Jun Wang ◽  
Bo Yu Sun ◽  
Chuan Gang Xiang ◽  
Jin Feng Li
Keyword(s):  
River Channel ◽  
Water Flooding ◽  
Production Ratio ◽  
Sand Body ◽  
Well Pattern ◽  
Different Types ◽  
Index Weight ◽  
Control Degree ◽  
Channel Type ◽  
Sand Type

According to sand-body genetic types, single sand-body is divided into five types include the polytectonic river-channel superimposed type, branching-river channel type, single river-channel type, sheet sand type and lentoid sand type. The use of multi-factor analysis to determine the index weight of control-degree of water flooding, recovery percent, water content, injection-production ratio and pressure distribution in different types of single sand-body, calculate different types of comprehensive Index of single sand-body adaptability. And analyze injection-production system to the well pattern adaptability in different types of single sand-body.

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