DF1-1底辟区构造应力场及渗流场演化的数值模拟研究

殷秀兰; 李思田; 杨计海

DF1-1底辟区构造应力场及渗流场演化的数值模拟研究

1.
中国地质科学院地质力学研究所, 北京 100081
2.
中国地质大学资源学院, 湖北武汉 430074
3.
南海西部石油公司, 广东湛江 524057

基金项目:

国家自然科学基金项目 40102012

中国地质调查局地质调查项目 DKD2104011

详细信息

作者简介:
殷秀兰(1968-), 女, 博士, 副研究员, 主要研究方向为盆地构造与流体. E-mail: xlyin@yin.com.cn

中图分类号: P554
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出版历程
- 收稿日期: 2003-03-24
- 刊出日期: 2003-05-25

Digital Simulation of Structural Stress Field and Flow Field in DF1-1 Diapir

1.
Institute of Geomechanics, CAGS, Beijing 100081, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
China Offshore Oil Nanhai West Corp., CNOOC, Zhanjiang 524057, China

摘要

摘要: DF1-1底辟区是莺歌海盆地内超压流体最活跃的地带之一.超压流体的活动直接受控于构造应力及其形成的不同类型的断裂和裂隙构成的输导系统.从底辟区大规模流体垂向活动以及幕式活动的特征来看, 流体流动的动力主要是由于垂向压差的存在以及渗流场变化引起的局部应力场(包括热应力场) 的作用所致.在详细研究底辟区的构造及流体活动关系的基础上, 对底辟区构造应力场及渗流场的演化进行了模拟.结果显示: 构造运动引起的应力场决定了DF1-1底辟区油气沿主要断裂系走向迁移的总趋势, 在底辟区流体从底辟的两侧向其中心运移, 由底辟体中向上运移为主; 高压流体产生的热应力控制局部应力场状况及油气运移方向, 驱动流体向底辟体顶部运移, 当热应力值过大时有可能改变应力场状况以及油气运移总趋势.
- DF1-1底辟 /
- 构造应力场 /
- 渗流场 /
- 数值模拟
Abstract: DF1-1 diapir is one of the most active areas with the overpressure fluid in Yinggehai basin. The overpressure fluids were controlled by the structural stress and migration system made up of different types of fractures and faults. In terms of the large-scale vertical and episodic fluid flows in the diaper area, the dynamics of the fluid flows is mainly attributed both to the vertical pressure difference and to the local stress fields (including thermal stress field) caused by the changes in infiltration flow field from fluid flow. The relationship between structure and fluid flow in the diaper area thus obtained in this paper is employed to simulate, together with the finite element digital method, the evolutions of both the structural stress fields and the infiltration fluid filed that are in line with the process of diapirism. The results show that the stress fields and fluid migration fields before diapirism are different from those after it. As a whole, stress fields from the tectonic stress determined the fluid migrating pattern along the fault zone in the DF1-1 diapir, that is, the fluids migrating from both sides of the diapir to its center and migrating upward from the diapir. Thermal stresses caused by the high-pressure fluid flow also controlled the local stress pattern and petroleum and gas fluid flow direction, which drove the matured hydrocarbon fluid migration upward from depression to highland. Too great a thermal stress value might have changed the stress pattern and the general trend of the petroleum and gas migration.
- DF1-1 diapir /
- structural stress field /
- migration field /
- digital simulation

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图 1 DF1-1底辟T₂₇界面断裂分布

Fig. 1. Fault distribution of T₂₇ in DF1-1 diapir

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图 2 DF1-1底辟作用之前数值模拟的地质模型(a) 及材料模型(b)

Fig. 2. Geological model (a) and material model (b) for the digital simulation of DF1-1 diapir before diapirism

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图 3 应力场数值模拟的约束及加载方式(a) 及温度载荷(b-底辟前, c-底辟后) 示意图

Fig. 3. Restrain and load (a) and thermal load (b. before diapir, c. after diapir) for the digital simulation of DF1-1 diapir

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图 4 DF1-1底辟作用之后数值模拟的地质模型(a) 及材料模型(b)

Fig. 4. Geological model (a) and material model (b) for the digital simulation of DF1-1 diapir after diapirism

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图 5 底辟作用之前913489剖面构造与温度联合作用下的τ_max分布(a) 及流体运移矢量(b) (等值线单位MPa)

Fig. 5. Distribution of τ_max field and vectorgraph of the velocity of fluid migration for the digital simulation of 913489 profile under structural stress and thermal load before diapirism

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图 6 底辟作用之后913489剖面构造与温度联合作用下的τ_max分布(a) 及流体运移矢量(b) (等值线单位MPa)

Fig. 6. Distribution of τ_max field (a) and vectorgraph of the velocity of fluid migration (b) for digital simulation of 913489 profile under structural stress and thermal load after diapirism

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表 1 DF1-1底辟数值模拟岩石力学及热力学参数表

Table 1. Mechanical and thermodynamical parameters of petrology in DF1-1 diapir

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