厚层河道砂体地应力分布影响因素分析

祖克威; 曾联波; 刘喜中; 张俊辉; 赵向原; 刘国平

厚层河道砂体地应力分布影响因素分析

1.
中国石油大学(北京)地球科学学院, 北京 102249
2.
中国石油大学油气资源与探测国家重点实验室, 北京 102249

详细信息

作者简介:
祖克威（1986-），男，博士，主要从事地应力分析与储层裂缝预测。E-mail：zukewei1234@aliyun.com

中图分类号: P553
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- 被引次数: 0
出版历程
- 收稿日期: 2014-02-24
- 刊出日期: 2014-06-01

ANALYSIS OF INFLUENCING FACTORS FOR GROUND STRESS IN CHANNEL SANDSTONE

1.
College of Earth Sciences, China University of Petroleum, Beijing 102249, China
2.
Key State Laboratory of Petroleum Resource and Prospecting at China Petroleum University, Beijing 102249, China

摘要

摘要: 相邻的沉积微相不仅地应力大小不同，地应力方向也存在较大差异。利用有限单元法，通过改变不同的边界条件（包括河道介质和周围岩体的弹性模量、泊松比，河道走向与区域主应力方向夹角及边界应力比），对河道砂体地应力的影响因素进行分析。模拟结果表明，相比于河道周围岩体和区域地应力特征，不同的边界条件对河道砂体地应力大小和方向的改变程度很大，其中河道砂体与周围岩体的弹性模量比、河道走向与区域主应力方向夹角及边界应力比是影响河道砂体现今地应力方向和大小的主要因素。研究结果可以为不同沉积微相下进行人工压裂和井网部署提供参考依据。
- 地应力 /
- 河道砂体 /
- 有限元法 /
- 影响因素
Abstract: With the further geological exploration, it is showed that different values and directions of in-situ stress are appeared in the adjacent sedimentary facies by a mass of production test data. By changing different boundary conditions(including the elasticity modulus and Poisson's ratio of channel and surrounding rock, the inclined angle between channel direction and the orientation of the regional principal stress and boundary stress ratio), the influence factors of the geostress in the channel sandstone are analyzed in finite element method. It is showed that the stress values and directions of the channel sandstone change seriously under the influences of different boundary conditions, compared with the in-situ stress characteristics in the surrounding rocks and region. The influence factors on the present stress of the channel sandstone are mainly the elastic modular ratio of channel to the surrounding rocks, the inclined angle between channel direction and the orientation of the regional principal stress and boundary stress ratio. The result could provide references for artificial fracturing and well network deployment in different sedimentary microfacies.
- ground stress /
- channel sandstone /
- finite element method /
- influence factors

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图 1 模型的几何条件和边界条件

Figure 1. Geometry and boundary conditions of the model

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图 2 不同E₁/E₂的河道砂体最大水平主应力方位对比图(黑色矩形内为河道砂体)

Figure 2. A comparison diagram of the maximum horizontal principal stress directions in channel sandstone with different E₁/E₂

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图 3 河道砂体最大主应力方向同E₁/E₂的关系

Figure 3. Relationship between the direction of maximum horizontal principal stress in channel sandstone and E₁/E₂

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图 4 不同E₁/E₂的河道砂体最大水平主应力大小对比

Figure 4. A comparison diagram of the maximum horizontal principal stress values in channel sandstone with different E₁/E₂

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图 5 河道砂体地应力大小与E₁/E₂的关系

Figure 5. Relationship between horizontal principal stress in channel sandstone and E₁/E₂

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图 6 河道砂体最大主应力方向与υ₁/υ₂的关系

Figure 6. Relationship between the direction of maximum horizontal principal stress in channel sandstone and υ₁/υ₂

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图 7 河道砂体地应力大小与υ₁/υ₂的关系

Figure 7. Relationship between horizontal principal stress in channel sandstone and υ₁/υ₂

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图 8 河道内最大主应力方向与θ的关系

Figure 8. Relationship between the direction of maximum horizontal principal stress in channel sandstone and θ

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图 9 河道内地应力大小同θ的关系

Figure 9. Relationship between horizontal principal stress in channel sandstone and θ

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图 10 河道砂体最大主应力方向与σ₁/σ₂的关系

Figure 10. Relationship between the direction of maximum horizontal principal stress in channel sandstone and σ₁/σ₂

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图 11 河道砂体地应力大小与σ₁/σ₂的关系

Figure 11. Relationship between horizontal principal stress in channel sandstone and σ₁/σ₂

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图 12 渤海南部某区块沉积相图

Figure 12. The sedimentary facies map of some block in Bonan zone

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