砂质辫状河储集层构型表征——以孤东油田七区西馆陶组为例

doi:10.7657/XJPG20250105

新疆石油地质 ›› 2025, Vol. 46 ›› Issue (1): 39-47.doi: 10.7657/XJPG20250105

砂质辫状河储集层构型表征——以孤东油田七区西馆陶组为例

杜娟¹(), 尹艳树¹(), 文斌², 任丽², 吴伟³

1.长江大学油气资源与勘探技术教育部重点实验室，武汉 430100
2.中国石油冀东油田分公司陆上油田作业区，河北唐山 063200
3.中国石化胜利油田东胜精攻石油开发集团股份有限公司，山东东营 257001

收稿日期:2024-09-24 修回日期:2024-10-20 出版日期:2025-02-01 发布日期:2025-01-24
通讯作者: 尹艳树（1978-），男，湖北仙桃人，教授，博士，油气田开发，（Tel）18086093896（Email）yys@yangtzeu.edu.cn
作者简介:杜娟（1999-），女，湖北荆州人，硕士研究生，储层表征与油藏描述，（Tel）17762596354（Email）2372770914@qq.com
基金资助:
国家自然科学基金(42372137)

Architecture Characterization of Sandy Braided River Reservoirs: A Case Study of Guantao Formation in Western Block 7 of Gudong Oilfield

DU Juan¹(), YIN Yanshu¹(), WEN Bin², REN Li², WU Wei³

1. MOE Key Laboratory of Hydrocarbon Resources & Exploration Technology, Yangtze University, Wuhan, Hubei 430100, China
2. Lushang Oilfield Operation Area, Jidong Oilfield Company, PetroChina, Tangshan, Hebei 063200, China
3. Shengli Oil Field Dongsheng Jinggong Petroleum Development (Group) Stock Co., Ltd., Shengli Oilfield, Sinopec, Dongying, Shandong 257001, China

Received:2024-09-24 Revised:2024-10-20 Online:2025-02-01 Published:2025-01-24

摘要/Abstract

摘要：

孤东油田七区西馆陶组N₁g45小层—N₁g16小层为辫状河沉积，砂体内部构型复杂，需精细解剖储集层结构，揭示其对油气开发的影响。采用Miall构型要素分析法，以现代辫状河规模作为约束，进行砂体储集层构型表征，采用动静结合手段检验研究成果，总结储集层构型对注水开发和剩余油分布的影响。结果表明：研究区为砂质辫状河沉积，主要发育辫状河道、心滩、溢岸以及泛滥平原4种构型单元；辫流带宽度为150~750 m，宽厚比为47~74；在辫流带内，有辫状河道-辫状河道、心滩-心滩、辫状河道-心滩-辫状河道和心滩-辫状河道-心滩4类构型模式；心滩平均长度为250~350 m，平均宽度为110~140 m，长宽比为2.20~2.50，心滩与河道平面面积比为0.36~0.51；心滩内一般发育2~4个落淤层，落淤层延伸长度为70~150 m，产状近水平，背水面夹层倾角为0.9°~2.3°；生产动态揭示由于构型单元边部物性变差，构型拼接部位油气流动受阻，成为局部剩余油富集区；在构型单元主体部位，油藏连通性好，开发效果好。

关键词: 孤东油田, 馆陶组, 储集层构型, 辫状河, 心滩, 落淤层, 剩余油

Abstract:

The sublayers from N₁g45 to N₁g16 of the Guantao formation in western Block 7 of the Gudong oilfield are typical of braided river deposits, with complex internal sandbody architectures. A detailed analysis of the reservoir architecture is necessary to understand its impact on oil and gas development. By using the Miall’s architectural element analysis method, and constrained by modern braided river scale, the sandbody architecture was characterized. Combining dynamic and static methods, the reservoir architectures were validated, and their influences on waterflood performance and residual oil distribution were identified. The research results show that the study area exhibits sandy braided river deposits, mainly with four sedimentary architecture units: braided river channels, mid-channel bars, overbanks, and floodplains. The braided flow zone is 150-750 m wide, with a width-to-thickness ratio ranging from 47 to 74. Within the braided flow zone, there are four types of architectural patterns: braided river channel-braided river channel, mid-channel bar-mid-channel bar, braided river channel-mid-channel bar-braided river channel, and mid-channel bar-braided river channel-mid-channel bar. The mid-channel bars have average length of 250-350 m and average width of 110-140 m, with a length-to-width ratio of 2.20-2.50. The ratio of mid-channel bar area to channel area ranges from 0.36 to 0.51. The mid-channel bars typically develop 2-4 fall-silt seams with their extension ranging from 70 to 150 m, which are nearly horizontal, with interlayer dip angles between 0.9° and 2.3°. Production performance reveals that due to poor petrophysical properties at the edges of architecture units, oil and gas flows are impeded at the architectural junctions where residual oil will be enriched locally. In contrast, the main parts of the architecture units show good reservoir connectivity and development effects.

Key words: Gudong oilfield, Guantao formation, reservoir architecture, braided river, mid-channel bar, fall-silt seam, residual oil

中图分类号:

TE122.2

杜娟, 尹艳树, 文斌, 任丽, 吴伟. 砂质辫状河储集层构型表征——以孤东油田七区西馆陶组为例[J]. 新疆石油地质, 2025, 46(1): 39-47.

DU Juan, YIN Yanshu, WEN Bin, REN Li, WU Wei. Architecture Characterization of Sandy Braided River Reservoirs: A Case Study of Guantao Formation in Western Block 7 of Gudong Oilfield[J]. Xinjiang Petroleum Geology, 2025, 46(1): 39-47.

图/表 7

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构型单元	岩性	测井曲线类型
心滩	棕褐色富含油细砂岩为主，多见大型槽状交错层理、板状交错层理和块状层理	箱形
辫状河道	棕褐色油浸细砂岩为主，发育块状层理及槽状交错层理	钟形
溢岩	粉砂岩和粉砂质泥岩互层沉积，出现多种小型交错层理	指形
泛滥平原	粉砂质泥岩和泥岩为主	微齿线形

单一辫流带组合模式	模式特点	识别标志类型	测井特征
辫状河道-辫状河道	辫状河道沉积时期不同	河道顶部高程差异	测井曲线特征相似，层内位置不同
辫状河道-辫状河道	辫状河道沉积时期相近，沉积厚度不同	河道砂体厚度差异	测井曲线特征相似，砂体厚度不同
辫状河道-河道间-辫状河道	辫状河道间发育其他微相类型	河间沉积	测井曲线特征相似，河道间发育其他微相类型

砂质辫状河储集层构型表征——以孤东油田七区西馆陶组为例

Architecture Characterization of Sandy Braided River Reservoirs: A Case Study of Guantao Formation in Western Block 7 of Gudong Oilfield

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