海上稀疏井网油田储层连通性研究——以北部湾盆地涠西南凹陷A油田涠三段为例

朱金起; 杨朝强; 杨燕; 陈奎; 傅涛

doi:10.11781/sysydz2025030680

海上稀疏井网油田储层连通性研究——以北部湾盆地涠西南凹陷A油田涠三段为例

doi: 10.11781/sysydz2025030680

中海石油有限公司湛江分公司, 广东湛江 524057

基金项目:

“十四五”重大科技项目“海上'双高—双特高’水驱油田提高采收率油藏关键技术” KJGG2021-0501

详细信息

作者简介:
朱金起(1990—)，男，工程师，从事开发地质研究工作。E-mail: zhujq7@cnooc.com.cn

中图分类号: TE122.2
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- 被引次数: 0
出版历程
- 收稿日期: 2024-11-04
- 修回日期: 2025-04-06
- 刊出日期: 2025-05-28

Reservoir connectivity of offshore oilfields with a sparse well pattern: a case study of the third member of Weizhou Formation of oilfield A in Weixinan Sag, Beibuwan Basin

Zhanjiang Branch of CNOOC Limited, Zhanjiang, Guangdong 524057, China

摘要

摘要: 为解决北部湾盆地涠西南凹陷A油田涠三段注采矛盾突出、剩余油分布复杂且难以动用等问题，通过储层构型界面分级、复合砂体解剖、储层构型单元定量化表征等海上稀疏井网油田储层构型技术体系开展研究，指导A油田储层连通性分析，从而解决A油田涠三段生产难题。垂向上，A油田涠三段不同油组可划分为3~4期单成因砂体；侧向上，综合储层侧向接触模式、砂体侧向规模约束、井震结合研究、生产动态验证，得到不同注采井在同期砂体的储层构型剖面；结合不同油组的沉积微相变化及水下分流河道厚度与宽度之间存在着正相关关系，进一步对A油田涠三段储层构型单元进行了定量化表征。在此基础上，从剖面和平面上分别对A油田主力开发层系W₃Ⅳ_D、W₃Ⅳ_E油组的连通性进行分析。剖面上，W₃Ⅳ_D油组水下分流河道砂体垂向叠置，河道间砂体连续性中等，横向整体连通性较好；平面上，南西物源方向的河道微摆动，规模变化较大，局部发育小规模河口坝，北东物源方向的河道较为顺直，规模变化不大。剖面上，W₃Ⅳ_E油组北部单井垂向上沉积微相及井间砂体厚度变化较快，砂体连续性一般，南部整体呈弱连通状态；平面上，南西物源方向的河道摆动明显，河口坝较发育，北东物源方向的河道较为顺直，间湾较发育。
- 储层连通性 /
- 储层构型 /
- 涠三段 /
- 涠西南凹陷 /
- 北部湾盆地
Abstract: To address the prominent injection and production contradiction, complex remaining oil distribution, and utilization issues in the third member of the Weizhou Formation (W₃) of oilfield A in the Weixinan Sag, Beibuwan Basin, the study developed a comprehensive reservoir configuration characterization system for offshore oilfields with a sparse well pattern, involving reservoir configuration interface classification, anatomy of composite sand body, and quantitative characterization of reservoir configuration unit. The reservoir connectivity was studied, aiming to optimize production strategies in the area. Vertically, the different oil groups in the third member of the Weizhou Formation in oilfield A could be divided into 3 to 4 monogenetic sand bodies. For lateral characterization, the study integrated multiple approaches, including reservoir contact pattern analysis, sand body scale constraints, well and seismic combination, and dynamic verification of production data to obtain the reservoir configuration profiles of different injection and production wells in the same period. Combined with variations in sedimentary microfacies of different oil groups and the positive correlations between the thickness and width of subaqueous distributary channels, the reservoir configuration unit of the third member of the Weizhou Formation in oilfield A was further quantitatively characterized. Based on that, the lateral and vertical connectivity of W₃Ⅳ_D and W₃Ⅳ_E oil groups in the main development layers of oilfield A was analyzed. Profile characterization of the W₃Ⅳ_D oil group showed that the subaqueous distributary channel sand bodies were vertically superimposed with moderate inter-channel sand body continuity and overall good lateral connectivity. Planar analysis showed that the river channels in the southwest provenance direction swung slightly with significant scale variations. Small-scale mouth bars were locally developed. The river channels in the northeast provenance direction were relatively straight with few scale variations. For W₃Ⅳ_E oil groups, the northern wells showed rapid changes in vertical sedimentary microfacies of single well and sand body thickness between wells, with moderate sand body continuity. The southern wells generally exhibited weaker connectivity. Planar studies revealed evident swings of river channels in the southwest provenance direction and well-developed mouth bars. The river channels in the northeast provenance direction were relatively straight, and the interdistributary bays were more developed.
- reservoir connectivity /
- reservoir configuration /
- the third member of Weizhou Formation /
- Weixinan Sag /
- Beibuwan Basin
注释:

利益冲突声明/Conflict of Interests

作者陈奎是本刊青年编委会成员，未参与本文的同行评审或决策。

Author CHEN Kui is a Young Editorial Board Member of this journal, and he did not take part in peer review or decision making of this article.

作者贡献/Authors’Contributions

朱金起、杨朝强、杨燕参与研究方法和技术手段讨论、设计；朱金起、陈奎、傅涛参与研究方法和技术手段的实践应用；朱金起、杨朝强、杨燕、陈奎、傅涛参与论文写作和修改。所有作者均阅读并同意最终稿件的提交。

ZHU Jinqi, YANG Zhaoqiang and YANG Yan participated in the discussion and design of research methods and technical means. ZHU Jinqi, CHEN Kui and FU Tao participated in the practical application of research methods and technical means. ZHU Jinqi, YANG Zhaoqiang, YANG Yan, CHEN Kui and FU Tao participated in paper writing and revision. All authors have read the final version of the paper and consented to its submission.

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图 1 北部湾盆地涠西南凹陷构造区划与研究区A油田位置

Figure 1. Structural division of Weixinan Sag in Beibuwan Basin and location of oilfield A in study area

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图 2 北部湾盆地涠西南凹陷A油田地层柱状图

Figure 2. Stratigraphic column of oilfield A in Weixinan Sag of Beibuwan Basin

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图 3 北部湾盆地涠西南凹陷A油田辫状河三角洲储层构型分级方案

Figure 3. Configuration classification scheme for braided river delta reservoirs in oilfield A of Weixinan Sag, Beibuwan Basin

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图 4 北部湾盆地涠西南凹陷A油田及围区砂体垂向分期识别标志

Figure 4. Identification markers for sand body vertical staging in oilfield A and its surrounding area in Weixinan Sag, Beibuwan Basin

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图 5 北部湾盆地涠西南凹陷A油田及围区涠三段W₃Ⅺ油组砂体垂向分期剖面

Figure 5. Sand body vertical staging profiles of W₃Ⅺ oil group in oilfield A and its surrounding area in Weixinan Sag, Beibuwan Basin

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图 6 北部湾盆地涠西南凹陷A油田及围区单砂体侧向划界标识图版

Figure 6. Single sand body lateral delimitation marking charts in oilfield A and its surrounding area in Weixinan Sag, Beibuwan Basin

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图 7 北部湾盆地涠西南凹陷A油田及围区井震结合构型解剖

Figure 7. Well and seismic combination configuration anatomy in oilfield A and its surrounding area in Weixinan Sag, Beibuwan Basin

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图 8 北部湾盆地涠西南凹陷A油田及围区W₃Ⅳ_E油组砂体构型剖面

Figure 8. Sand body configuration profiles of W₃Ⅳ_E oil group in oilfield A and its surrounding area in Weixinan Sag, Beibuwan Basin

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图 9 北部湾盆地涠西南凹陷A油田及围区涠三段水下分流河道宽度和厚度拟合关系

Figure 9. Fitting relationships of width and thickness of subaqueous distributary channels of the third member of Weizhou Formation in oilfield A and its surronding area, Weixinan Sag, Beibuwan Basin

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图 10 北部湾盆地涠西南凹陷A油田W₃Ⅳ_D油组连通关系剖面

Figure 10. Connectivity profile of W₃Ⅳ_D oil group in oilfield A, Weixinan Sag, Beibuwan Basin

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图 11 北部湾盆地涠西南凹陷A油田W₃Ⅳ_E油组连通关系剖面

Figure 11. Connectivity profile of W₃Ⅳ_E oil group in oilfield A, Weixinan Sag, Beibuwan Basin

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图 12 北部湾盆地涠西南凹陷A油田W₃Ⅳ_D油组不同期次砂体沉积微相平面图

Figure 12. Planar distribution of sedimentary microfacies for sand bodies in different stages of W₃IV_D oil group in oilfield A of Weixinan Sag, Beibuwan Basin

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图 13 北部湾盆地涠西南凹陷A油田W₃Ⅳ_E油组不同期次砂体沉积微相平面图

Figure 13. Planar distribution of sedimentary microfacies for sand bodies in different stages of W₃Ⅳ_E oil group in oilfield A of Weixinan Sag, Beibuwan Basin

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表 1 碎屑沉积地质体构型界面分级据参考文献[20-21]修改。

Table 1. Classification of configuration interfaces for clastic sedimentary geological body

构型界面级别	时间规模/a	构型单元(以河流相为例)	米兰科维奇旋回	MIALL界面分级	经典层序地层分级	基准面旋回分级	油层对比单元分级
1级	10⁸	叠合盆地充填复合体			巨层序
2级	10⁷~10⁸	盆地充填复合体			超层序
3级	10⁶~10⁷	盆地充填体		8	层序	长期	含油层系
4级	10⁵~10⁶	体系域	偏心率周期	7	准层序组	中期	油层组
5级	10⁴~10⁵	叠置河流沉积体	黄赤交角周期	6	准层序	短期	砂组/小层
6级	10³~10⁴	曲流带/辫状带	岁差周期	6	层组	超短期	单层
7级	10³~10⁴	河流沉积体		5	层
8级	10²~10³	点坝/心滩坝		4	层
9级	10⁰~10¹	增生体		3	层
10级	10^-2~10^-1	层系组		2	纹层组
11级	10^-3~10^-5	层系		1	纹层组
12级	10^-6	纹层		0	纹层

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表 2 北部湾盆地涠西南凹陷A油田辫状河三角洲储层构型分级方案

Table 2. Configuration classification scheme for braided river delta reservoirs in oilfield A of Weixinan Sag, Beibuwan Basin

构型界面级别	时间规模/a	构型单元	储集层构型要素	MIALL界面分级^[20]	经典层序地层分级	基准面旋回分级
6级	10³~10⁴	三角洲沉积体	分流河道砂层组顶、底界面	6	层组	超短期
7级	10³~10⁴	同期水下分流河道和河口坝复合体	分流河道砂体顶、底界面	5	层
8级	10²~10³	单一水下分流河道或河口坝	分流河道砂体侧积体顶面	4	层
9级	10⁰~10¹	内部增生体	洪水期不同阶段沉积界面	3	层
10级	10^-2~10^-1	层系组	交错层系组界面	2	纹层组
11级	10^-5~10^-3	层系	交错层系界面	1	纹层组
12级	10^-6	纹层	纹层	0	纹层

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表 3 北部湾盆地涠西南凹陷A油田及围区水下分流河道展布定量规模数据

Table 3. Quantitative scale data of subaqueous distributary channels in oilfield A and its surronding area, Weixinan Sag, Beibuwan Basin

油组	前缘分支河道数	河道期次	复合河道厚度/m	复合河道宽度/m	复合河道宽厚比	单一河道厚度/m	单一河道宽度/m	单一河道宽厚比	定量关系
W₃Ⅰ	6~7	3	10.9~21.3	459~697	33~46	2.0~10.8	201~697	51~88	W=127.86H^{0.710 5} R²=0.744 5
W₃Ⅳ_D	5~6	3	9.1~30.0	417~912	27~58	2.2~13.7	239~912	58~88	W=136.99H^{0.697 9} R²=0.740 8
W₃Ⅳ_E	4~6	4	10.1~25.8	440~751	26~53	2.3~10.7	270~751	63~90	W=159.55H^{0.652 1} R²=0.676 7
W₃Ⅴ	6	3	6.3~16.9	407~671	35~62	2.0~8.2	261~655	66~92	W=126.27H^{0.752 5} R²=0.557 7
W₃Ⅵ	6	3	6.4~18.2	344~872	30~68	2.1~10.9	309~872	61~89	W=76.953H^{1.010 9} R²=0.782 0
W₃Ⅶ	5~6	4	7.2~24.0	362~783	25~53	2.4~11.4	236~783	58~90	W=119.42H^{0.779 4} R²=0.769 6
W₃Ⅷ	5~6	3	7.9~26.1	380~846	31~61	2.6~14.3	265~846	56~88	W=161.52H^{0.625 3} R²=0.681 1
W₃Ⅸ	6	4	10.7~25.0	398~834	24~58	2.0~11.0	212~767	56~89	W=130.23H^{0.726 5} R²=0.770 6
W₃Ⅹ	3~6	3	6.6~17.5	368~777	36~58	2.5~11.1	298~734	63~92	W=171.83H^{0.607 4} R²=0.693 3
W₃Ⅺ	6	3	8.0~20.3	435~801	32~55	3.3~13.4	344~801	51~90	W=171.83H^{0.607 4} R²=0.693 3

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