山东蓬莱近海岸的地应力状态及断层稳定性评价

李兵; 丁立丰; 王建新; 侯砚和; 谢富仁

doi:10.12090/j.issn.1006-6616.2019.25.04.043

山东蓬莱近海岸的地应力状态及断层稳定性评价

doi: 10.12090/j.issn.1006-6616.2019.25.04.043

李兵^{1, 2,},
丁立丰²,
王建新²,
侯砚和²,
谢富仁²

1.
中国科学技术大学地球和空间科学学院, 安徽合肥 230026
2.
中国地震局地壳应力研究所, 北京 100085

基金项目:

中国地震局地壳应力研究所中央级公益性科研院所基本科研业务专项资助项目 ZDJ2019-20

详细信息

作者简介:
李兵(1984-), 男, 助理研究员, 从事地应力测量以及构造应力场方面的研究。E-mail:mycoon@mail.ustc.edu.cn

中图分类号: P553
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出版历程
- 收稿日期: 2018-06-06
- 修回日期: 2018-11-28
- 刊出日期: 2019-08-01

THE STATE OF THE IN-SITU STRESS AND FAULT STABILITY EVALUATION OF THE PENGLAI COAST

1.
School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, Anhui, China
2.
Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China

摘要

摘要: 为查明蓬莱近海岸的地应力状态，开展了2个钻孔（深度小于200m）的水压致裂地应力测量工作，并与长岛附近海域3个钻孔的地应力状态进行了对比，采用回归分析方法，分析了该地区地应力随深度变化的特征，结合最大剪应力与平均主应力之比（μ_m）和侧压力系数（K'）探讨了研究区的断层稳定性。结果表明：蓬莱近海岸和长岛海域的地应力状态基本一致，最大水平主应力方向主要表现为北东东至东西向，这与华北的区域应力场相一致；水平应力的梯度大于环渤海圈的平均地应力梯度；研究区浅部三向主应力相对大小以S_H > S_h > S_v为主，这有利于逆断层的活动；研究区K'值和μ_m值均较高，分布区间分别为：2.76~3.98和0.47~0.59；陆区断层与区域应力方向均以较大角度相交，处于稳定的状态；海域的北西西向和北东向断层与区域应力场的方向夹角较小，如果区域应力持续增强，将有利于走滑断层的活动，这与震源机制以走滑型地震为主相符。研究结果对研究区内断层稳定性的评价和重大工程的设计及施工都具有重要参考意义。
- 渤海海峡跨海通道 /
- 蓬莱近海岸 /
- 长岛 /
- 地应力状态 /
- Byerlee准则 /
- 断层稳定性
Abstract: In order to find out the in-situ stress state near the Penglai coast, hydraulic fracturing in-situ stress measurement was conducted in two boreholes (less than 200 meters in depth). The results were compared with the in-situ stress state of three boreholes off Changdao. Regression analysis was adopted to analyze the variation of in-situ stress with depth in this area. Fault stability in the study area was discussed combined with the ratio (μ_m) of maximum shear stress to average principal stress and lateral pressure coefficient(K'). The results show that the in-situ stress state of the Penglai coast is basically the same with that of Changdao, with the direction of the maximum horizontal principal stress being mainly NEE-EW which is consistent with the regional stress field in north China. The gradient of horizontal stress is greater than the average in-situ stress gradient of Bohai Rim. The relative magnitude of the three-dimensional principal stress in the shallow part of the study area is mainly S_H > S_h > S_v which is conducive to the movements of the reverse faults. The values of both the study area and μ_m are high whose distribution intervals are 2.76~3.98 and 0.47~0.59 respectively. The land area faults and regional stress directions intersect at larger angles and are in a stable state; the angles between the NWW and NE faults of the sea area and the regional stress fields are smaller. If the regional stress continues to increase, it will be conducive to the movements of the strike-slip faults. This may be the primary reason for the frequent earthquakes of Changdao which is consistent with the fact that the focal mechanism of the earthquakes is mainly strike-slip. The research results are of great significance not only to the evaluation of fault stability in the study area but also to the design and construction of major projects.
- Bohai Strait cross-sea Channel /
- Penglai Coast /
- Changdao /
- In-situ stress state /
- Byerlee's law /
- fault stability
注释:

责任编辑:吴芳

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图 1 蓬莱和长岛附近的断裂分布图

Figure 1. Fracture distribution map near Penglai and Changdao

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图 2 压力-时间测量曲线

Figure 2. The curves of pressure vs. time

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图 3 ZK7和ZK13的主应力随深度变化

Figure 3. Curves of principal stress with depths in boreholes ZK7 and ZK13

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图 4 ZK7和ZK13的K_Hmax和K_a随深度变化

Figure 4. Variation of K_Hmax and K_a with depths in boreholes ZK7 and ZK13

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图 5 测区5个孔的S_H方向随深度的分布

Figure 5. The variation of the direction of S_H with depths in 5 boreholes

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图 6 5个孔的K_a和K′随深度变化情况

Figure 6. Variation of K_a and K′ with depths in 5 boreholes

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表 1 钻孔的地应力测量结果

Table 1. Results of in-situ stress measurement in boreholes

钻孔编号	岩性	序号	测量深度/m	主应力值/MPa			方位/°	P₀/MPa	μ_m	K_Hmax	K_a	K′
钻孔编号	岩性	序号	测量深度/m	S_H	S_h	S_v	方位/°	P₀/MPa	μ_m	K_Hmax	K_a	K′
	花岗岩	1	71.87	7.36	4.9	1.9		0.65	0.69	3.87	3.23	5.37
	花岗岩	2	81.27	6.15	4.3	2.15		0.74	0.59	2.86	2.43	3.84
	花岗岩	3	109.63	8.43	5.07	2.9		1.02	0.60	2.91	2.33	3.94
ZK7	花岗岩	4	129.08	11.32	6.86	3.42	NW80°	1.21	0.64	3.31	2.66	4.57
	花岗岩	5	146.25	10.39	6.23	3.87	NE79°	1.38	0.57	2.68	2.15	3.62
	花岗岩	6	162.44	9.25	5.79	4.3		1.54	0.47	2.15	1.75	2.79
	花岗岩	7	178.8	13.71	8.05	4.73	NE78°	1.7	0.60	2.90	2.30	3.96
	花岗岩	8	192.3	13.24	8.08	5.09		1.83	0.56	2.60	2.09	3.50
	花岗岩	1	73.59	9.28	5.72	1.95		0.66	0.74	4.76	3.85	6.68
	花岗岩	2	83.02	8.08	4.61	2.2		0.75	0.67	3.67	2.88	5.06
ZK13	花岗岩	3	92.68	9.07	5.41	2.45		0.84	0.67	3.70	2.96	5.11
	花岗岩	4	102.06	8.26	5.5	2.7	NE63°	0.94	0.61	3.06	2.55	4.16
	花岗岩	5	138.78	8.52	5.56	3.67		1.30	0.51	2.32	1.92	3.05
	花岗岩	6	146.52	10.7	6.84	3.88	NE71°	1.37	0.58	2.76	2.26	3.72
	花岗岩	7	156.22	7.55	5.03	4.13	NE75°	1.47	0.39	1.83	1.52	2.29
	花岗岩	8	173.36	11.36	6.9	4.59		1.64	0.53	2.47	1.99	3.29
注：S_v-垂直应力; S_v的计算取上覆岩石容重2.70 g/cm³；P₀-静水压力。K_a-平均水平主应力与垂直应力之比；K_Hmax最大水平主应力与垂直主应力之比，K′-有效应力条件下的K_Hmax；μ_m-最大剪应力与平均主应之比。

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