Reservoir Architecture Analysis of Delta Front and Its Control on Remaining Oil Distribution of S Oilfield in Bohai Bay Basin
- Junfei Li (CNOOC Ltd, Tianjin Branch) | Xueqi Liu (PetroChina Research Inst. Petroleum Exploration and Development) | Zhennan Gao (CNOOC Ltd, Tianjin Branch) | Baobing Shang (CNOOC Ltd, Tianjin Branch) | Jing Xu (CNOOC Ltd, Tianjin Branch)
- Document ID
- Society of Petroleum Engineers
- SPE Asia Pacific Oil and Gas Conference and Exhibition, 23-25 October, Brisbane, Australia
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- reservoir architecture analysis, comprehensive adjustment, delta front, remaining oil distribution
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After more than 20 years’ development, S oilfield has entered high water cut stage. The layer contradiction is prominent and the water flooding condition is complex, which result in the complex decentralized state of the remaining oil. In order to determine the remaining oil distribution to guide the comprehensive adjustment of the oilfield, the reservoir architecture analysis of delta front was conducted.
Based on the core, seismic data, dense well logging data and production performance data, the reservoir architecture of delta front in Dongying group is characterized with hierarchy process, model guidance and numerical simulation methods. In the paper, the distribution style of interlayers in single mouth bar is discussed. The distribution feature of the remaining oil under the control of interlayers is analyzed.
It shows that multiple main channels form continuous mouth bar complex and single mouth bar develops several accretions. Interlayers in single mouth bar express in two forms: the foreset type along the source direction and the arch type perpendicular to the source direction with a low angle from 0.4° to 1.0°. Along the source direction, remaining oil gathers inside accretions whose injection-production does not correspond under the control of interlayers. And the remaining oil is enriched at the front of accretion. In the vertical source direction, the remaining oil accumulates in the high part of accretions. Under the guidance of remaining oil distribution characteristics controlled by reservoir architecture, one horizontal well was deployed. The average output is more than 100m3/d and the water cut is under 30%, which indicates the effect of this reservoir architecture analysis work.
The successful implementation of the horizontal well demonstrates the vital function of the reservoir architecture research for this kind of mature oilfield. This will also be one promising research direct for the overall adjustment and remaining oil tapping.
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Su Yanchun, Li Tingli, Huo Chunliang. 2015. Innovation and Practice of Reservoir Architecture Detailed Characterization and Remaining Oil Potential Tapping Technology in High Water-cut Stage of Large Offshore Fluvial Heavy Oilfield. Presented at SPE Annual Technical Conference and Exhibition, Houston,Texas, 28-30 September. SPE-175062-MS.