川西凹陷新场须二段深部地应力场特征及岩体破裂规律研究
发布时间：2018-09-17 10:16
【摘要】：本文以川西凹陷新场须二段深部地应力场特征及岩体破裂规律为研究对象,根据新场地区及临区已有的地层岩性、地质构造及其演化等资料,同时结合深部岩体钻井岩芯裂缝发育特征编录、录井测井地应力和裂缝分析成果、完井报告资料的对比研究,建立了研究区的地质模型。结合已有的井孔崩落、钻井诱导缝分析、水压致裂曲线分析、岩石Kaiser效应测试等技术所获得的地应力资料,综合分析了新场须二段各运动期次的构造应力。然后利用工程地质的系统工作方法和构造地质学的分析方法,分析研究区地应力场特征,预测研究深部岩体结构面的特征及其发育分布规律。通过以上研究,取得的主要研究成果如下:(1)综合区域研究资料,研究区须家河组二段的地层在历史上共经历了印支运动中期(安县运动)、印支运动中期~印支运动晚期、燕山运动早幕~燕山运动中幕、燕山运动晚幕~喜山运动早幕、喜马拉雅运动等5次规模较大的构造运动。(2)将传统的构造地质学与现代岩石力学、地应力测试技术、大型物理模拟和数值模拟技术相结合,构建了一套深部地应力场分析及裂缝预测评价的方法体系。(3)根据新场地区须家河组二段的地表露头调查、测井曲线、成像测井、钻孔岩芯分析说明,须二段储层裂缝发育特征为以低角度裂缝为主,同时发育斜交缝、高角度缝、网状缝等,裂缝走向主要有NEE、NE、SEE三个方向。(4)开展了多期Kaiser试验,建立了利用多期Kaiser试验提取古地应力的思路和初步方法。试验结果初步表明研究区地层在历史上至少经历过四期构造运动作用,获得的各期主应力方向、大小与区域资料较为吻合。(5)采集须家河组砂岩在地表出露的岩样,进行了室内单轴、三轴物理力学试验,获得了相应物理力学参数,并统计了区内各地层的物理力学参数相应资料。(6)研究区地形相对平坦,区内断裂构造是影响研究区应力场分布特点的重要因素。三个目的层中,由于均发育较多断裂构造,因此其应力场表现出明显的不连续性,在断层端部和转折部位表现出较明显的最大主应力和剪应力集中现象,而在断层两盘部位则出现应力消散特点,最小主应力在断裂周围表现较明显的拉应力。从纵向剖面上看,研究区应力场具有较明显的分带性,具体表现为千佛崖以上地层,最大主应力方向多近于水平,应力场分布较连续;须家河组地层受断层影响,主应力方向在不同部位往往存在较大差别,尤其在断层周围,主应力方向往往多变,应力场部分大多不连续;须家河底板以下地层,最大主应力方向大多转为近竖直向,应力场分布也较为连续。(7)根据三维物理模拟和数值模拟的结果,参考研究区现有岩芯观察、测井分析等资料,确定出研究区裂缝发育分布的预测标准,对区内三个目的层裂缝发育特征进行了预测。结果显示:须家河二段第七、第四、第二砂组岩层顶板中裂缝主要发育在断裂带附近、翼部较陡的转折端及构造高点区域。研究区裂缝总体方向主要是北东(NE)向、近南北(SN)向、北西(NW)向和东西(EW)向,以低角度剪切缝为主;此外在构造高点地区,发育也有较大部分张性裂缝。
[Abstract]:In this paper, the characteristics of in-situ stress field and fracture law of rock mass in the second member of Xu formation in Xinchang area, western Sichuan sag are studied. According to the data of strata lithology, geological structure and evolution in Xinchang area and adjacent area, and combined with the characteristics of fracture development in drilling core of deep rock mass, the results of in-situ stress and fracture analysis by logging and completion report are presented. The geological model of the study area is established by comparing the materials. Combining with the geostress data obtained by the existing techniques such as hole caving, drilling induced fracture analysis, hydraulic fracturing curve analysis, rock Kaiser effect test, the tectonic stress of the second member of Xu formation in Xinchang is analyzed comprehensively. Through the above research, the main achievements are as follows: (1) The strata of the second member of Xujiahe Formation in the study area have gone through the middle period of Indosinian movement in history (Anxian County). (2) Combining traditional tectonic geology with modern rock mechanics, in-situ stress testing technology, large-scale physical simulation and numerical simulation technology, (3) According to the surface outcrop survey, logging curves, imaging logging and core analysis of boreholes in the second member of Xujiahe Formation in Xinchang area, the characteristics of fracture development in the second member of Xujiahe Formation are mainly low angle fractures, and oblique joints, high angle fractures and reticulated fractures are developed. There are three main directions of fracture strikes: NEE, NE and SEE. (4) The Kaiser test was carried out for several periods, and the idea and preliminary method of extracting paleo-stress by using the Kaiser test were established. (5) The rock samples of Xujiahe Formation sandstone exposed on the surface were collected, and uniaxial and triaxial physical and mechanical tests were carried out in laboratory. The corresponding physical and mechanical parameters were obtained, and the corresponding data of physical and mechanical parameters of various layers in the study area were counted. (6) The topography of the study area was relatively flat, and the fracture structure in the study area was the major factor affecting the stress field distribution characteristics. The main factor is that the stress field of the three target beds is obviously discontinuous due to the development of more faults. The maximum principal stress and shear stress concentration are obvious at the end and the turning point of the fault, while the stress dissipation occurs at the two sides of the fault, and the minimum principal stress is obvious around the fault. Seen from the longitudinal section, the stress field in the study area has obvious zoning, specifically for the strata above the Qianfoya cliff, the maximum principal stress direction is more near the level, the stress field distribution is more continuous; the Xujiahe formation is affected by the fault, the principal stress direction in different parts are often quite different, especially around the fault, the principal stress direction. The stress direction is often changeable, and the stress field is mostly discontinuous; the maximum principal stress direction is mostly near vertical in the strata below the bottom of Xujiahe River, and the stress field distribution is also relatively continuous. (7) According to the results of three-dimensional physical simulation and numerical simulation, and referring to the existing core observation, logging analysis and other data, the fracture development in the study area is determined. The results show that the cracks in the roof of the seventh and fourth member of the second member of Xujiahe Formation are mainly developed near the fault zone, the steep turning end of the wing and the high structural point area. The NW and EW trending shear fractures are mainly low-angle shear fractures, and most of the tensional fractures are also developed in the structural high-point areas.
【学位授予单位】：成都理工大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TE31
[Abstract]:In this paper, the characteristics of in-situ stress field and fracture law of rock mass in the second member of Xu formation in Xinchang area, western Sichuan sag are studied. According to the data of strata lithology, geological structure and evolution in Xinchang area and adjacent area, and combined with the characteristics of fracture development in drilling core of deep rock mass, the results of in-situ stress and fracture analysis by logging and completion report are presented. The geological model of the study area is established by comparing the materials. Combining with the geostress data obtained by the existing techniques such as hole caving, drilling induced fracture analysis, hydraulic fracturing curve analysis, rock Kaiser effect test, the tectonic stress of the second member of Xu formation in Xinchang is analyzed comprehensively. Through the above research, the main achievements are as follows: (1) The strata of the second member of Xujiahe Formation in the study area have gone through the middle period of Indosinian movement in history (Anxian County). (2) Combining traditional tectonic geology with modern rock mechanics, in-situ stress testing technology, large-scale physical simulation and numerical simulation technology, (3) According to the surface outcrop survey, logging curves, imaging logging and core analysis of boreholes in the second member of Xujiahe Formation in Xinchang area, the characteristics of fracture development in the second member of Xujiahe Formation are mainly low angle fractures, and oblique joints, high angle fractures and reticulated fractures are developed. There are three main directions of fracture strikes: NEE, NE and SEE. (4) The Kaiser test was carried out for several periods, and the idea and preliminary method of extracting paleo-stress by using the Kaiser test were established. (5) The rock samples of Xujiahe Formation sandstone exposed on the surface were collected, and uniaxial and triaxial physical and mechanical tests were carried out in laboratory. The corresponding physical and mechanical parameters were obtained, and the corresponding data of physical and mechanical parameters of various layers in the study area were counted. (6) The topography of the study area was relatively flat, and the fracture structure in the study area was the major factor affecting the stress field distribution characteristics. The main factor is that the stress field of the three target beds is obviously discontinuous due to the development of more faults. The maximum principal stress and shear stress concentration are obvious at the end and the turning point of the fault, while the stress dissipation occurs at the two sides of the fault, and the minimum principal stress is obvious around the fault. Seen from the longitudinal section, the stress field in the study area has obvious zoning, specifically for the strata above the Qianfoya cliff, the maximum principal stress direction is more near the level, the stress field distribution is more continuous; the Xujiahe formation is affected by the fault, the principal stress direction in different parts are often quite different, especially around the fault, the principal stress direction. The stress direction is often changeable, and the stress field is mostly discontinuous; the maximum principal stress direction is mostly near vertical in the strata below the bottom of Xujiahe River, and the stress field distribution is also relatively continuous. (7) According to the results of three-dimensional physical simulation and numerical simulation, and referring to the existing core observation, logging analysis and other data, the fracture development in the study area is determined. The results show that the cracks in the roof of the seventh and fourth member of the second member of Xujiahe Formation are mainly developed near the fault zone, the steep turning end of the wing and the high structural point area. The NW and EW trending shear fractures are mainly low-angle shear fractures, and most of the tensional fractures are also developed in the structural high-point areas.
【学位授予单位】：成都理工大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TE31
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