Analysis and discussion on cause of OWC differentiation of complex faulted reservoir in Bohai area: A case study of well block 7 in W oilfield of Liaozhong sag

Zheng Hua; Li Yunpeng; Chen Jianbo; Chen Dayong; Song Hongliang

doi:10.13809/j.cnki.cn32-1825/te.2018.05.004

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Analysis and discussion on cause of OWC differentiation of complex faulted reservoir in Bohai area: A case study of well block 7 in W oilfield of Liaozhong sag

更新时间：2025-12-11

- Analysis and discussion on cause of OWC differentiation of complex faulted reservoir in Bohai area: A case study of well block 7 in W oilfield of Liaozhong sag
- Petroleum Reservoir Evaluation and Development Vol. 8, Issue 5, Pages: 23-28(2018)
- 作者机构：
  
  中海石油（中国）有限公司天津分公司渤海石油研究院,天津,300459
- 作者简介：
- 基金信息：
- DOI：10.13809/j.cnki.cn32-1825/te.2018.05.004
  CLC： TE347
- Published：2018
- 稿件说明：
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Zheng Hua, Li Yunpeng, Chen Jianbo, et al. Analysis and discussion on cause of OWC differentiation of complex faulted reservoir in Bohai area: A case study of well block 7 in W oilfield of Liaozhong sag[J]. Petroleum Reservoir Evaluation and Development, 2018, 8(5): 23-28.
DOI：

Zheng Hua, Li Yunpeng, Chen Jianbo, et al. Analysis and discussion on cause of OWC differentiation of complex faulted reservoir in Bohai area: A case study of well block 7 in W oilfield of Liaozhong sag[J]. Petroleum Reservoir Evaluation and Development, 2018, 8(5): 23-28. DOI： 10.13809/j.cnki.cn32-1825/te.2018.05.004.

摘要

经典油气成藏理论认为

油气总是聚集在圈闭的高部位

而油田实际勘探开发过程中

油水界面差异现象时有发生。渤海W油田位于渤海辽中凹陷中段的凹中反转带上

属于复杂断块油藏

针对该油田走滑转换带中部署的开发井

围绕该井钻后出现的高部位未钻遇到油层而出现油水界面差异现象的成因进行了分析研究

在进行小层划分与对比基础上

重点从构造、成藏及储层三个方面进行原因分析论证

认为油水界面差异是由于油气溢散成藏条件不佳以及砂体叠置不连通所造成

并且根据砂体刻画追踪及沉积规律研究

认为该井区东三段表现为退积现象

东二段表现为进积现象。经统计

东二段砂地比高于东三段

东三段泥岩较发育

纵向封隔性相比较好

而进积和退积模式对应着不同砂体的叠置关系

从而形成了油水界面差异现象。

Abstract

According to the classical theories of the oil and gas accumulation

oil and gas are always gathering in the trap of high position. However

the phenomenon of OWC differentiation occurrs occasionally during the actual exploration and development of the oil field. W oilfield located in the concave inversion zone of the middle section in Liaozhong sag of Bohai Sea is a complex fault block reservoir. For the developed wells in the strike slip zone of the oilfield

we analyze the causes of the OWC differentiation. On the basis of the stratification and contrast

the reasons are mainly from the aspects of structure

accumulation and reservoir. It shows that OWC diffe

rentiation is due to the poor accumulation condition and sand body superimposition. According to the research on tracking of sand body and deposition characterization

it is considered that Dong-3 segment of this area shows the retrogradation phenomena

while the Dong-2 segment shows the progradation phenomenon. Besides

the Dong-2 segment

s sand strata ratio is higher than that of Dong-3 segment. The mudstone of Dong-3 segment is relatively developed with good longitudinal plugging. Meanwhile

the progradation and retrogradation patterns are corresponding to the superposition relation of different sandbody. Then

a difference in oil-water interface appeared.

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Related Institution

Bohai Oilfield Research Institute,Tianjin Branch of CNOOC Limited

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