【摘要】：本文研究首先收集郯廬斷裂帶中段的地質構造資料,全面了解研究區(qū)的地質背景。其次,應用水壓致裂法和CBDM法準確獲取研究區(qū)的應力數據,并對數據進行分析。再次,梳理總結了斷層強度的評價指標,包括最大主應力方向與斷層面夾角α和應力積累指標μm,并根據應力數據分析了郯廬斷裂帶中段的斷層強度特征。接著,利用郯廬斷裂帶中段的小震震源機制解,根據斷層強度評價指標分析其深部的斷層強度特征。最后,利用3DEC軟件模擬郯廬斷裂帶中段的活動性,探討應力狀態(tài)與斷層強度之間的關系。基于以上研究內容,本文取得以下新的進展和認識。(1)研究區(qū)內結構面產狀受隱伏斷層影響,隱伏斷層斷層面以上結構面傾向SN,傾角約60°,與斷層面產狀一致;在斷層面以下的結構面傾向NE,傾角約60°,是郯廬斷裂帶和隱伏斷層共同影響的結果。(2)利用改進優(yōu)化后的水壓致裂法獲取多組準確有效的應力數據,結果顯示最大水平主應力方向平均值為N84.1°E,三向應力值關系表現為SHShSv,斷層表現為逆斷性質。(3)郯廬斷裂帶中段最大主應力與斷層面夾角為64.1°~74.1°(2α*),故斷層摩擦系數比較低,斷層相對于脆性地殼來說比較弱。研究區(qū)內應力積累指標μm平均值為0.48,說明該區(qū)域應力積累水平較高,且地殼處于其極限狀態(tài)。(4)郯廬斷裂帶中段μm在0.2~0.4之間區(qū)域主要分布在研究區(qū)以南,該區(qū)域發(fā)生小地震的頻率比較高,應力不易積累;μm大于0.4的區(qū)域主要分布在研究區(qū)范圍內以及以北渤海海域當中,說明該區(qū)域應力積累程度高。(5)根據郯廬斷裂帶中段的應力狀態(tài)和斷層摩擦系數,通過3DEC軟件模擬發(fā)現,EW向擠壓應力不斷增大時,郯廬斷裂帶中段東側的應力值增加幅度大于西側,可能暗示東側發(fā)生地震的可能性大于西側。
[Abstract]:In this paper, the geological structure data of the middle section of the Tan-Lu fault zone are collected, and the geological background of the study area is comprehensively understood. Secondly, hydraulic fracturing method and CBDM method are used to accurately obtain the stress data of the study area and analyze the data. Thirdly, the evaluation indexes of the fault strength are summarized, including the angle between the maximum principal stress direction and the fault plane 偽 and the stress accumulation index 渭 m, and the characteristics of the fault strength in the middle section of the Tanlu fault zone are analyzed based on the stress data. Then, the focal mechanism of small earthquakes in the middle section of the Tanlu fault zone is used to analyze the characteristics of the deep fault strength according to the evaluation index of the fault strength. Finally, the 3DEC software is used to simulate the activity of the middle part of the Tan-Lu fault zone, and the relationship between the stress state and the fault strength is discussed. Based on the above research, this paper has made the following new progress and understanding: (1) the occurrence of structural plane in the study area is affected by hidden faults, and the tendency of the structural plane above the hidden fault plane is about 60 擄, which is consistent with the occurrence of fault plane; The NE, inclination of the structural plane below the fault plane is about 60 擄, which is the result of the influence of the Tan-Lu fault zone and the concealed fault. (2) the improved hydraulic fracturing method is used to obtain many groups of accurate and effective stress data. The results show that the average value of the maximum horizontal principal stress direction is N84.1 擄E, and the relationship of the three direction stress values is that the SHShSv, fault is inversely faulted. (3) the angle between the maximum principal stress and the fault plane is 64.1 擄~ 74.1 擄(2 偽 *) in the middle part of the Tanlu fault zone. Therefore, the coefficient of friction of faults is relatively low, and the fault is weaker than that of brittle crust. The average value of stress accumulation index 渭 m in the study area is 0.48, which indicates that the stress accumulation level in this area is high and the crust is in its limit state. (4) the area of 渭 m in the middle segment of the Tanlu fault zone is mainly distributed in the south of the study area. The frequency of small earthquakes in this area is relatively high, and the stress is not easy to accumulate. The area with 渭 m greater than 0.4 is mainly distributed in the study area and in the Bohai Sea north of the study area, indicating that the stress accumulation in the area is high. (5) according to the stress state and the friction coefficient of the fault in the middle part of the Tanlu fault zone, It is found by 3DEC simulation that the stress in the east side of the middle section of the Tanlu fault zone is larger than that in the west side when the compressive stress in the direction of EW is increasing, which may imply that the possibility of an earthquake occurring in the east side is greater than that in the west side.
【學位授予單位】：中國地質大學(北京)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P315.2

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