NUMERICAL SIMULATION OF STRUCTURAL STRESS FIELD IN FUNING SEDIMENTARY PERIOD AND PREDICTION OF THE DEVELOPMENT LAW OF LOWER-ORDER FAULTS IN CHAJIAN SLOPE ZONE
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摘要: 汊涧斜坡带位于金湖凹陷西斜坡南部，第三系沉积期间主要经历了吴堡和三垛运动，形成了复杂的断裂体系，属复杂断块油藏，区内低级序断层较为发育。根据断层平面展布确定阜宁期最小主应力方向为北北西350°，采用有限元法建立地质模型并进行构造应力场数值模拟，计算得出各应力分布，并据此对低级序断层发育规律进行预测。研究表明，汊涧斜坡带阜宁期最大、最小主应力均为水平方向，形成的低级序断层具有张扭性特征；低级序断层的发育主要受最大与最小主应力差值及剪应力控制，主应力差值控制断层优势发育地区，平面剪应力控制断层走向，剖面剪应力控制断层倾向。Abstract: Chajian slope zone is located in the south of the western slope, Jinhu sag. It has mainly experienced the Wubao and Sanduo tectonic movements during the sedimentation in Tertiary, which formed the complicated fault system and made it into a complex fault-block reservoir. There are many lower-order faults in this area, which makes great influence to the reservoir description and the development deployment, but they cannot be described correctly only based on the seismic data. The determination of the structural stress direction in Funing sedimentary period, which is NW350°, is based on the areal description of the faults. The method of numerical simulation of tectonic stress was applied to make the geological model and simulate the description of structural stress in Funing sedimentary period. The development law of the lower-order faults was predicted according to the description of structural stress. The results show that the maximum and the minimum principal stress were both in the horizontal direction, which usually forms tenso-shear faults. The development of the lower-order fault is mainly influenced by the difference between the maximum and minimum principal stress and the shear stress. In other words, the difference between principal stresses control the advantage area of the fault development, the plane shear stress control the strike of the fault, and the profile shear stress control the dip direction.
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Key words:
- Chajian slope zone /
- Funing sedimentary period /
- stress field /
- numerical simulation /
- lower-order fault
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图 1 金湖凹陷西斜坡构造简图
Figure 1. A simplified structural map of the western slope zone in Jinhu sag
图 2 金湖凹陷西斜坡南部断层平面展布图
Figure 2. Distribution of the faults in the western slope zone of Jinhu sag
图 3 金湖凹陷西斜坡南部阜宁组断层走向玫瑰花图
Figure 3. Rose diagram of fault strike of Funing Formation in the south of the western slope of Jinhu sag
图 4 汊涧斜坡带阜宁期地质模型
Figure 4. Geological model of Chajian slope zone in Funing sedimentary period
图 5 阜宁期应力场最小主应力及最大主应力分布（正值代表张应力）
Figure 5. Distributions of the minimum and the maximum principal stresses in Funing sedimentary period
图 6 阜宁期最小与最大主应力差值及平面剪应力
Figure 6. Differences between the minimum and maximum principal stresses and the plane shear stress in Funing sedimentary period
表 1 汊涧斜坡带阜宁期应力场模拟力学参数
Table 1. Mechanical parameters in stress field simulation of Funing Period in Chajian slope zone
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