断控气藏的动态成藏物理模拟与启示——以柴达木盆地西北地区典型气藏为例

罗群; 王仕琛; 贾春; 代兵; 张宏利; 文璠; 邱兆轩

doi:10.11781/sysydz202205790

断控气藏的动态成藏物理模拟与启示——以柴达木盆地西北地区典型气藏为例

doi: 10.11781/sysydz202205790

罗群^{1, 2,},
王仕琛^{1, 2},
贾春³,
代兵⁴,
张宏利^{1, 2},
文璠^{1, 2},
邱兆轩^{1, 2}

1.
中国石油大学(北京) 油气资源与探测国家重点实验室, 北京 102249
2.
中国石油大学(北京) 非常规天然气研究院, 北京 102249
3.
四川省地质矿产勘查开发局, 成都 610100
4.
四川省地质矿产勘查开发局二〇二地质队, 四川宜宾 644002

基金项目:

中国石油—中国石油大学(北京)战略合作科技专项 ZLZX2020016

详细信息

作者简介:
罗群(1963-), 男, 博士, 教授, 从事非常规油气成藏与地质评价研究。E-mail: luoqun2002@263.net

中图分类号: TE122.3
计量
- 文章访问数: 450
- HTML全文浏览量: 137
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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-31
- 修回日期: 2022-08-30
- 刊出日期: 2022-09-28

Physical simulation of dynamic accumulation of fault-controlled gas reservoirs and its implications: a case study of typical gas reservoirs in northwestern part of Qaidam Basin

LUO Qun^{1, 2
,},
WANG Shichen^{1, 2},
JIA Chun³,
DAI Bing⁴,
ZHANG Hongli^{1, 2},
WEN Fan^{1, 2},
QIU Zhaoxuan^{1, 2}

1.
State Key Laboratory of Petroleum Resources and Exploration, China University of Petroleum (Beijing), Beijing 102249, China
2.
Unconventional Oil and Gas Science and Technology Research Institute, China University of Petroleum (Beijing), Beijing 102249, China
3.
Sichuan Provincial Bureau of Geology and Mineral Exploration and Development, Chengdu, Sichuan 610100, China
4.
202 Geological Team, Sichuan Provincial Bureau of Geology and Mineral Exploration and Development, Yibing, Sichuan 644002, China

摘要

摘要: 天然气成藏过程的动态物理模拟是揭示天然气运聚成藏机理、总结其分布规律的重要手段，然而由于天然气本身特性，使得“易泄漏、难动态、难观察”成为天然气运聚动态成藏物理模拟的最大问题。为了揭示断控气藏运聚成藏机制，总结其气藏形成序列和分布模式，以柴达木盆地西北地区东坪、马海—南八仙典型气藏为例，在建立各个典型气藏成藏演化地质模式基础上，针对气藏模拟存在的问题，设计了既能实现构造动态变化过程，同时又能清晰观察气体充注、运移、聚集现象的“一种可调式天然气运聚成藏模拟装置”。运用该装置成功模拟了东坪、马海—南八仙等典型气藏形成过程，明确了断层不仅作为气体运移和传递动力的通道，还控制了演化序列和分布模式；建立了“晚期成藏”和“长期成藏”两种不同类型天然气藏的形成演化序列模式，揭示了“断传高压驱动”天然气运移成藏机理，明确“深浅共存、浅差深好”的天然气藏纵向保存系列，提出了“有浅(浅层气藏)必有深(深层气藏)”，据“浅”寻找“深”的天然气勘探新理念。
- 断控气藏 /
- 天然气成藏 /
- 物理模拟 /
- 柴达木盆地
Abstract: The dynamic physical simulation of natural gas accumulation process is one of the important means to reveal the mechanism of natural gas migration and accumulation and to summarize its distribution law. However, due to the characteristics of natural gas itself including "easy to leak, difficult to move and difficult to observe" have become holdbacks for the physical simulation of natural gas migration and accumulation. In order to reveal the migration and accumulation mechanisms of fault-controlled gas reservoirs, and to summarize the formation sequence and distribution pattern of gas reservoirs, typical reservoirs in Dongping, Mahai and Nanbaxian areas in the northwestern part of Tarim Basin were taken as examples to establish a geological evolution model for each reservoir. Aiming at the problems of gas reservoir simulation, an adjustable simulation device for gas migration and accumulation was designed, which could realize the dynamic process of structural change and clarify the phenomenon of gas charging and migration, and the formation process of typical gas reservoirs such as Dongping, and Mahai-Nanbaxian, etc. was successfully simulated. It is clear that the fault not only acts as a channel for gas migration and power transmission, but also controls the evolution sequence and distribution pattern. The formation and evolution sequence models of two different types of natural gas reservoirs, named "late accumulation" and "long-term accumulation", were proposed, the mechanism of natural gas migration and accumulation driven by "fault transmission and high pressure" was revealed, and the vertical preservation sequence featured by "co-existence of natural gas in both deep and shallow formations, and the deeper formations are more favorable for preservation" was concluded. A new concept of natural gas exploration was put forward that "if there are shallow gas reservoirs, there must be deep ones", and we can find natural gas from shallow to deep formations.
- fault-controlled gas reservoir /
- natural gas accumulation /
- physical simulation /
- Qaidam Basin

HTML全文

图 1 柴达木盆地西部和西北地区T_r断裂与侏罗系烃源岩、气藏分布

据青海油田资料(2011年)修改。

Figure 1. Distribution of T_r fault and Jurassic source rocks and gas reservoirs in western and northwestern Qaidam Basin

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图 2 柴达木盆地东坪构造天然气运移成藏模式

Figure 2. Migration and accumulation model of natural gas in Dongping structure, Qaidam Basin

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图 3 柴达木盆地马海—南八仙油气藏油气运聚成藏模式

据青海油田资料(2011年)修改。

Figure 3. Migration and accumulation model of oil and gas in Mahai-Nanbaxian reservoir, Qaidam Basin

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图 4 手动非均匀挤压天然气运聚动态成藏物理模拟实验装置照片(背视)

Figure 4. Experimental device for physical simulation of natural gas migration and dynamic accumulation with manual and non-uniform extrusion (back view)

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图 5 气藏模拟实验装置实物图及几何尺寸示意

Figure 5. Experimental device for gas reservoir simulation and its schematic diagram

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图 6 手动非均匀挤压天然气运聚动态成藏物理模拟实验装置示意(正面)

Figure 6. Experimental device for physical simulation of natural gas migration and dynamic accumulation with manual and non-uniform extrusion (front view)

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图 7 柴达木盆地东坪气藏形成演化模式

Figure 7. Formation and evolution model of Dongping gas reservoir in Qaidam Basin

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图 8 柴达木盆地东坪构造气藏形成过程物理模拟实验模型

Figure 8. Experimental model for physical simulation of formation process of Dongping structural gas reservoir, Qaidam Basin

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图 9 缓慢挤压逐渐加速注气阶段(时间在0~11′48″)实验现象示意

Figure 9. Schematic diagram of experimental phenomenon during the stage of slow extrusion and gradually speeding gas injection (0-11′48″)

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图 10 实验在缓慢注气9′56″和11′48″时刻天然气沿断裂运聚成藏的实验照片

Figure 10. Experimental photos of natural gas migration and accumlation along faults during slow gas injection at 9 ′56″ and 11′48″

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图 11 加速挤压大量注气阶段(时间大致在11′48″~13′20″)实验现象示意

Figure 11. Schematic diagram of experimental phenomenon during the stage of speeding extrusion with large amount of gas injection (approximately 11′48″-13′20″)

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图 12 柴达木盆地南八仙油气藏形成史示意

Figure 12. Formation history of Nanbaxian oil and gas reservoir in Qaidam Basin

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图 13 柴达木盆地马仙构造气藏形成过程物理模拟实验模型

Figure 13. Experimental model for physical simulation of formation process of Maxian structural gas reservoir in Qaidam Basin

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图 14 缓慢挤压逐渐加速注气阶段(时间大致从0′~8′)实验现象示意

Figure 14. Schematic diagram of experimental phenomenon during the stage of slow extrusion and gradually speeding gas injection (roughly from 0′ to 8′)

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图 15 加速挤压大量注气阶段(时间大致从11′~20′)实验现象照片

Figure 15. Experimental photos of speeding extrusion and mass gas injection stage (roughly from 11′ to 20′)

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表 1 柴达木盆地东坪气藏动态成藏物理模拟实验参数设定

Table 1. Parameter setting of physical simulation experiment for dynamic accumulation of Dongping gas reservoir in Qaidam Basin

实验参数	65.5~23.5 Ma(第一阶段)E	23.5~5.3 Ma(第二阶段)N₁	5.3.0 ~0 Ma(第三阶段)N₂—Q
实验过程初步设定	缓慢挤压	缓慢挤压逐渐加速注气阶段	加速挤压大量注气阶段
地史时间差/Ma		0	18.2，23.5
实验时间设定/min		0	9.1，11.8
预期压缩距离/mm		10	50
预期压缩速率/(mm·min^-1)		0.55	18.5
进气量	无	少量	大量

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表 2 柴达木盆地马海西—南八仙气藏物理模拟实验参数设定

Table 2. Parameter setting of physical simulation experiment for Western Mahai-Nanbaxian gas reservoirs in Qaidam Basin

实验参数	65.5~23.5 Ma(第一阶段)E	23.5~3.0 Ma(第二阶段)N₁—N₂²	3.0~0 Ma(第三阶段)N₂³—Q
实验过程初步设定	缓慢挤压	缓慢挤压逐渐加速注气阶段	加速挤压大量注气阶段
地史时间差/Ma		0	20.5，23.5
实验时间预期设定/min		0	8.0，22.0
预期压缩距离/mm		10	22
预期压缩速率/(mm·min^-1)		0.8	1.57
进气量	无	少量	大量

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