渤海海域渤中19-6潜山气藏成藏要素匹配及成藏模式

牛成民; 王飞龙; 何将启; 汤国民

doi:10.11781/sysydz202102259

渤海海域渤中19-6潜山气藏成藏要素匹配及成藏模式

doi: 10.11781/sysydz202102259

1.
中海石油(中国)有限公司天津分公司, 天津 300452
2.
中海石油(中国)有限公司勘探部, 北京 100028

基金项目:

中海油“十三五”油气资源评价项目 YXKY-2018-KT-01

详细信息

作者简介:
牛成民(1966—)，男，教授级高级工程师，从事油气勘探研究工作。E-mail：niuchm@cnooc.com.cn

中图分类号: TE122.3
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出版历程
- 收稿日期: 2020-04-22
- 修回日期: 2021-01-28
- 刊出日期: 2021-03-28

Accumulation factor matching and model of Bozhong 19-6 buried hill gas reservoir, Bohai Sea area

1.
Tianjin Branch of CNOOC Ltd., Tianjin 300452, China
2.
Exploration Department of CNOOC Ltd., Beijing 100028, China

摘要

摘要: 为了明确渤海海域渤中19-6潜山千亿立方米气藏的形成过程，基于大量岩心、薄片、测井及地球化学数据，在地质分析的基础上，利用地球化学分析方法和盆地模拟的手段，对其成藏要素及成藏规律进行了系统分析。研究表明：（1）渤中凹陷沙三段烃源岩生气强度普遍超过50×10⁸ m³/km²，晚期持续供烃为渤中19-6潜山气藏的形成提供了充足的物质基础；（2）印支期和燕山期构造运动是渤中19-6潜山构造裂缝型储层和潜山圈闭形成的关键时期，并形成了近源断裂输导体系和远源不整合面输导体系；（3）东营组厚层超压泥岩盖层和潜山较弱的晚期构造活动有利于渤中19-6潜山气藏的保存；（4）“生、储、盖、圈、运、保”六大成藏要素的时空匹配，最终导致了渤中19-6潜山千亿立方米大气田的形成。建立了渤中19-6潜山多洼供烃、多向充注、断裂和不整合联合输导的晚期成藏模式。
- 渤中19-6潜山气田 /
- 成藏要素耦合 /
- 成藏模式 /
- 渤中凹陷 /
- 渤海海域
Abstract: The accumulation factors and mechanism of the 100 billion cubic meters gas reservoir in the Bozhong 19-6 buried hill of the Bohai Sea area were studied using geochemical analyses and basin modelling based on a large amount of core, cast thin section, well logging and geochemical data. The results showed the following. (1) The gas generated by the source rocks of the third member of the Shahejie Formation in the Bozhong Sag generally exceeds 5×10⁹ m³/km². The continuous hydrocarbon supply in the late period provided sufficient material for the formation of the Bozhong 19-6 buried hill gas reservoir. (2) The Indosinian and Yanshanian tectonic movements were the key periods for the formation of structural fractured reservoirs and buried-hill traps, and formed a near-source fault transport system and a far-source unconformity transport system. (3) The thick overpressure mudstone cap rocks of the Dongying Formation and the weak tectonic activity in the late period were beneficial to the preservation of the Bozhong 19-6 buried hill gas reservoir. (4) The time-space matching of the six major accumulation factors of "generation, storage, cap rock, trap, migration, and preservation" ultimately led to the formation of a large gas field of 100 billion cubic meters in the Bozhong 19-6 buried hill. A late accumulation model of multi-depression hydrocarbon supply, multi-directional charging, combined fault and unconformity transport was established in the Bozhong 19-6 buried hill.
- Bozhong 19-6 buried hill gas reservoir /
- accumulation factor coupling /
- accumulation model /
- Bozhong Sag /
- Bohai Sea area

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图 1 渤海海域渤中凹陷区域概况示意及沉积地层综合柱状图

Figure 1. Tectonic settings and stratigraphic column of Bozhong Sag, Bohai Sea area

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图 2 渤海海域渤中凹陷烃源岩热演化史

Figure 2. Thermal evolution history of source rocks in Bozhong Sag, Bohai Sea area

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图 3 渤海海域渤中凹陷沙三段烃源岩生气强度

Figure 3. Gas intensity of Es₃ source rocks in Bozhong Sag, Bohai Sea area

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图 4 渤海海域渤中19-6潜山裂缝储层形成期次

Figure 4. Formation period of fractured reservoirs in Bozhong 19-6 buried hill, Bohai Sea area

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图 5 渤海海域渤中19-6潜山构造直接盖层厚度统计

Figure 5. Direct cap thickness of Bozhong 19-6 buried hill, Bohai Sea area

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图 6 渤海海域渤中凹陷潜山圈闭群构造演化史

Figure 6. Tectonic evolution history of buried hill trap group in Bozhong Sag, Bohai Sea area

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图 7 渤海海域渤中19-6潜山输导体系

剖面位置见图 1。

Figure 7. Transport system of Bozhong 19-6 buried hill, Bohai Sea area

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图 8 渤海海域渤中19-6构造井声波时差与流体压力分布

Figure 8. Acoustic time and fluid pressure distribution in wells in Bozhong 19-6 structure, Bohai Sea area

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图 9 渤海海域渤中19-6构造直接盖层盖储剩余压力差统计

Figure 9. Pressure difference between direct cap rocks and reservoirs in Bozhong 19-6 buried hill, Bohai Sea area

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图 10 渤海海域渤中19-6构造油气藏成藏期次分析

Figure 10. Hydrocarbon accumulation periods of Bozhong 19-6 buried hill, Bohai Sea area

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图 11 渤海海域渤中19-6构造天然气成藏要素关系

Figure 11. Correlation of natural gas accumulation factors in Bozhong 19-6 buried hill, Bohai Sea area

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图 12 渤海海域渤中19-6潜山气藏成藏模式

剖面位置见图 1。

Figure 12. Hydrocarbon accumulation pattern in Bozhong 19-6 buried hill, Bohai Sea area

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