Research of the Modern Tectonic Stress Field and Seismicity Characteristics on the Northeastern Side of Pamirs

According to the earthquake focal mechanism solutions of 55 moderately strong earthquakes onthe northeastern side of Pamirs,the spatial and temporal distribution of earthquakes ith M_s≥6.0 since this century and the characteristics of hypocenter depth distribution of earthquakeswith M_s≥3.0 since 1980 in this region,the article discusses the relation between regional tee-tonic stress fields and strong earthquake activity.The result shows that the hypocenter disloca-tion is mostly strike-dip,partly dip-slip,and the direction of the principal compressional stressis nearly NS.The distributive characteristics of strong shock activity is obvious,with the gen-eral trend that the west is strong and the east is weak,which can be divided into three imephases,and each with relative principal active region The depth near Pamirs aren reaches200km,shallower obviously when externding to NE,less than or equal to 40km near the Kalpinblock,and the article discusses the result.

The Relationship between Fractures and Tectonic Stress Field in the Extra Low-Permeability Sandstone Reservoir at the South of Western Sichuan Depression

The formation and distribution of fractures are controlled by paleotectonic stress field, and their preservative status and effects on development are dominated by the modern stress field. Since Triassic, it has experienced four tectonic movements and developed four sets of tectonic fractures in the extra low-permeability sandstone reservoir at the south of western Sichuan depression. The strikes of fractures are in the S-N, NE-SW, E-W, and NW-SE directions respectively. At the end of Triassic, under the horizontal compression tectonic stress field, for which the maximum principal stress direction was NW.SE, the fractures were well developed near the S-N faults and at the end of NE-SW faults, because of their stress concentration. At the end of Cretaceous, in the horizontal compression stress fields of the NE-SW direction, the stress was obviously lower near the NE-SW faults, thus, fractures mainly developed near the S-N faults. At the end of Neogene-Early Pleistocene, under the horizontal compression tectonic stress fields of E-W direction, stress concentrated near the NE-SW faults and fractures developed at these places, especially at the end of the NE-SE faults, the cross positions of NE-SW, and S-N faults. Therefore, fractures developed mostly near S-N faults and NE-SW faults. At the cross positions of the above two sets of faults, the degree of development of the fractures was the highest. Under the modern stress field of the NW-SE direction, the NW-SE fractures were mainly the seepage ones with tensional state, the best connectivity, the widest aperture, the highest permeability, and the minimum opening pressure.

Acoustic emission-based numerical simulation of tectonic stress field for tectoclase prediction in shale reservoirs of the northern Guizhou area, China

Natural fractures,like tectoclases,are essential in the formation of shale gas reservoirs and have been the focus of study for shale gas development.Tectoclases provide most storage space for gas and are largely controlled by the paleo-tectonic stress field in shale reservoirs of the Niutitang Formation,northern Guizhou area,China.An accurate prediction of the development and distribution of tectoclases in the reservoirs is of great significance to exploring and developing shale gas sweet spots in the area.Based on geological structure evolution and fracture characterization,this study is focused on factors that control the fracture development in the Niutitang Formation shale reservoirs in northern Guizhou through characterization and modeling of geomechanisms and tectonic movements.A geomechanical model is formulated for the shale reservoirs against the geological background of the area.On this basis,the fractures are predicted by using the acoustic emission data.Numerical simulation results show that the development and distribution of tectoclase is controlled by fault zones,some of which have no obvious turning points with tectoclase in the middle sections being more developed and fragmented than those at the two ends.Some of these have obvious S-shaped turning points where tectoclases are the most developed and fragmented.

Numerical calculations of tectonic stress field of Chinese mainland and its neighboring regions and their applications to explanation of seismic activity

This paper made a numerical simulation to the basic tectonic stress field of Chinese mainland and its neighboringregion using the visco-elasticity finite element model and the new published displacement rate result. Main contents include the simulation of maximum shear stress and its varying rate, the maximum shear strain and its varyingrate, the shear strain energy density and its varying rate. In view of the high inhomogeneous distribution characterof seismicity in space and time in Chinese mainland and its neighboring area, the normalized background energyvalue was given by means of normalized treatment to the earthquake energy release in the eastern and westernparts of Chinese mainland. And the comparison of the simulation result with the actual seismicity was made. Thefesults show that the simulation values can explain well the earthquake distribution character of Chinese mainlandand its neighboring area.

Study on the Recent Tectonic Stress Field in the “Huoshan Seismic Window” Region

The focal mechanisms of 62 moderate-small earthquakes since 1980 in the ＂ Huoshan seismic window＂ region are calculated with the method developed recently by Snoke, combining the use of the first motion of P, SV and SH waves with their amplitude ratios. Based on these abundant focal mechanisms, the mean tectonic stress field in the ＂Huoshan seismic window＂ region is inverted with the average stress tensor method, and the result shows that the ＂Huoshan seismic window＂ region is horizontally compressed in the near EW direction and horizontally dilated in the near NS direction, which is in accord with statistical results of focal mechanism parameters. We estimate the difference （also referred to as consistency parameter 0） between the force axis direction of the focal mechanism solution and the mean stress tensor, then further analyze the variation characteristics of 0 versus time, and the relationship with moderately strong earthquakes in the east China region. The result indicates that 0 in the ＂ Huoshan seismic window＂ region is in good correspondence with moderately strong earthquakes in the East China region. When 0 is lower than the mean value, corresponding moderately strong earthquakes may occur in the East China region.

Ambient tectonic shear stress field in Southern California and seismic hazard regions

ccording to the fracture mechanics rupture model of earthquakes put forward by us, several equations to compute tectonic ambient shear stress value τ0 have been derived [equations (1), (2), (3), (5)].τ0 values for intermediate and small earthquakes occurred in Chinese mainland and Southern California have been calculated by use of these equations. The results demonstrate that the level and distribution of τ0 are closely related to the location where large earthquakes will occur, i.e. the region with higher level of τ0 will be prone to occur large earthquakes and the region with lower level will usually occur small earthquakes. According to the spatial distribution of τ0 , the seismic hazard regions or the potential earthquake source regions can in some degree be determined. According to the variation of τ0 with time, the large earthquake occurrence time can be roughly estimated. According to the distribution of τ0 in Southern California and variation with time, three high stress level regions are determined, one (Goldfield area) of them is the present seismic hazard region.

The dependence of response spectrum on the tectonic ambient shear stress field

It has been analyzed the influence of the tectonic ambient shear stress value on response spectrum based on the previous theory. Based on the prediction equation BJF94 presented by the famous American researchers, CLB20, a new prediction formula is proposed by us, where it is introduced the influence of tectonic ambient shear stress value on response spectrum. BJF94 is the prediction equation, which mainly depends on strong ground motion data from western USA, while the prediction equation SEA99 is based on the strong ground motion data from exten-sional region all over the world. Comparing these two prediction equations in detail, it is found that after BJF94′s prediction value lg(Y) minus 0.16 logarithmic units, the value is very close to SEA99′s one. This case demonstrates that lg(Y) in extensional region is smaller; the differences of prediction equation are mainly owe to the differences of tectonic ambient shear stress value. If the factor of tectonic ambient shear stress value is included into the pre-diction equation, and the magnitude is used seismic moment magnitude to express, which is universal used around the world, and the distance is used the distance of fault project, which commonly used by many people, then re-gional differences of prediction equation will become much less, even vanish, and it can be constructed the uni-versal prediction equation proper to all over the world. The error in the earthquake-resistant design in China will be small if we directly use the results of response spectrum of USA (e.g. BJF94 or SEA99).

Donghe Sandstone Subtle Reservoir Exploration and Development Technology in Hade 4 Oilfield

Hade 4 oilfield is located on the Hadexun tectonic belt north of the Manjiaer depression in the Tarim basin, whose main target layer is the Donghe sandstone reservoir, with a burial depth over 5,000m and an amplitude below 34m, at the bottom of the Carboniferous. The Donghe sandstone reservoir consists of littoral facies deposited quartz sandstones of the transgressive system tract, overlapping northward and pinching out. Exploration and development confirms that water-oil contact tilts from the southeast to the northwest with a drop height of nearly 80m. The reservoir, under the control of both the stratigraphic overlap pinch-out and tectonism, is a typical subtle reservoir. The Donghe sandstone reservoir in Hade 4 oilfield also has the feature of a large oil-bearing area (over 130 km2 proved), a small thickness (average efficient thickness below 6m) and a low abundance (below 50 × 104t/km2). Moreover, above the target layer developed a set of igneous rocks with an uneven thickness in the Permian formation, thus causing a great difficulty in research of the velocity field. Considering these features, an combination mode of exploration and development is adopted, namely by way of whole deployment, step-by-step enforcement and rolling development with key problems to be tackled, in order to further deepen the understanding and enlarge the fruits of exploration and development. The paper technically focuses its study on the following four aspects concerning problem tackling. First, to strengthen the collecting, processing and explanation of seismic data, improve the resolution, accurately recognize the pinch-out line of the Donghe sandstone reservoir by combining the drilling materials in order to make sure its distribution law; second, to strengthen the research on velocity field, improve the accuracy of variable speed mapping, make corrections by the data from newly- drilled key wells and, as a result, the precision of tectonic description is greatly improved; third, to strengthen the research on sequence stratigraphy and make sure the distribution law of the Donghe sandstone; and fourth, with a step- by-step extrapolation method, to deepen the cognition of the leaning water-oil contact, and by combining the tectonic description and drilling results, to make sure little by little the law of change of the water-oil contact. The exploration and development of the Donghe sandstone subtle reservoir in Hade 4 oilfield is a gradually perfected process. From 1998 when it was discovered till now, the reservoir has managed to make a benign circle of exploration and development, in which its reserve has gradually been enlarged, its production scale increased, and, in a word, it has used techniques necessary for this subtle reservoir in the Tarim basin.

碳酸盐岩储层高精度构造应力场模拟与裂缝多参数分布预测方法及其应用

构造裂缝是碳酸盐岩的主要储集空间之一,局部应力导致的构造破裂是影响裂缝发育的重要因素。基于有限元方法的构造应力场模拟已成为构造裂缝预测的重要方法,但尚未能解决模型设置与实际地质情况相差较大、最优边界条件获取效率低以及构造裂缝发育的主控因素不清晰等问题。①引入非均质岩石力学模型构建方法和自适应边界条件约束算法以提升应力场模拟的精度,根据储层破裂率和断裂活动性等参数定量表征储层裂缝发育特征;②定量探讨走滑断裂变形特征的差异和应力扰动对构造裂缝发育的影响,优选控制构造裂缝发育的最强因素构建碳酸盐岩裂缝型储集体发育指数并定量研究其主控因素;③以储集体发育规模预测为基础,结合单井裂缝测井和岩心解释成果,建立不同级别碳酸盐岩裂缝型储集体的地质模式。将该方法在中国塔里木盆地顺北地区18号断裂带及邻区奥陶系碳酸盐岩储层中应用。结果表明,张扭段、平移段与压扭段的裂缝发育程度依次降低。地层变形幅度越大,裂缝发育程度越高。储层岩石力学参数、距断裂的距离、水平两向应力差、应力非均质性系数和综合破裂率被用于构建裂缝型储集体发育指数,其分级结果与实际地质情况匹配度较高。

页岩气储层多期构造应力场反演与裂缝演化

川南泸州区块五峰组—龙马溪组的页岩气蕴藏量大,构造运动使地应力局部集中,从而引起裂缝和断层的产生,对页岩气的勘探开发有较大影响。为了优选页岩气勘探区,采用地震综合资料、古构造图和岩石力学参数测试等方法,运用神经网络算法和地质力学建模方法,对研究区多期古构造应力场进行反演,并对应力影响下的储层裂缝发育规律进行预测。研究结果表明:采用数值模拟和神经网络算法,可以进行多期构造作用下的地应力场反演。多期构造运动使地应力发生调整变化,地层背斜部位应力较为集中,背斜核部受到强烈构造作用而发生破裂,应力逐步释放;多期构造运动使储层岩石承受的应力逐步变化,易出现破裂带而形成断层,应力逐步减小;原有断层周边裂缝发育较为强烈,易出现应力衰减区域,从而出现多而短的小型裂缝。现今应力场受多期构造运动综合影响,分布较复杂,裂缝发育规律性不强,对页岩气钻井、开发等影响较大。研究成果对深层页岩气的勘探开发具有一定的指导意义。

江汉-洞庭盆地地震精定位及活动性特征

利用江汉-洞庭盆地及其周缘有历史记载以来至2021年的地震资料,分析地震时空特征,通过双差定位法对788个地震进行精定位,获得深部地质构造与地震的关系,并采用P波初动法计算ML≥2.8地震的震源机制解,分析区域构造应力场特征。结果表明,地震在空间上分布较为不均,盆地边界地震活动性强于盆地内部,在时间上地震活动存在明显的平静与活跃交替的周期性规律;精定位后的地震在宁乡、石门、远安-当阳、南漳-荆门和鄂州-黄石等5个地区呈NW和NE向丛集条带状分布,且这些地区的地震成因与断裂构造活动密切相关;盆地震源机制解以逆断型为主,P轴优势方位为近EW向,倾伏角近水平,T轴方位以近SN和NE向为主,倾伏角较高。印度洋板块与欧亚板块碰撞导致青藏高原内部形成近EW向拉张应力场,对江汉-洞庭盆地产生东向推挤,加之菲律宾海板块NWW向和太平洋板块西向俯冲运动,导致江汉-洞庭盆地形成近EW向挤压的应力场格局,使得区域断裂构造易发生垂直差异运动,进而导致江汉-洞庭盆地及其周缘地震的孕育和发生。

顺北地区走滑断裂带奥陶系碳酸盐岩裂缝分布预测与主控因素研究

构造裂缝是碳酸盐岩的主要储集空间之一,能为致密灰岩提供油气运移的良好通道和储集空间。构造裂缝的发育受构造位置、岩性、地层厚度、温度、围压和构造破裂等多种因素的影响,其中区域构造应力场的局部构造应力导致的构造破裂是控制构造裂缝发育的主导因素。针对碳酸盐岩储层的特点与裂缝发育特征,采用在单井动态岩石力学参数标定下,基于三维地震数据体的岩石力学参数反演功能获取非均质岩石力学模型,以提升应力场模拟中模型力学参数的真实性和准确性;引入自适应边界条件约束方法,以自动获取模拟结果与实测结果误差最小时的最优边界条件,从而显著提升应力场模拟的精度与可靠性。并在此基础上,通过储层张破裂率、剪破裂率、综合破裂率、水平两向应力差、应力非均质系数和断裂面滑动趋势系数等参数,定量表征了SHB16号断裂带及邻区的储层裂缝发育特征与活动性。储层裂缝的发育特征与断裂的活动关系密切,故定性或定量研究了水平两向应力差、距断裂的距离和断裂的垂向活动强度等参数对储层裂缝发育特征的控制作用,用斯皮尔曼等级相关系数定量研究变量之间的相关性。在明确储层裂缝发育的控制因素的基础上,构建奥陶系碳酸盐岩储层规模储集体发育指标,将奥陶系碳酸盐岩储层划分为从最优至最差的Ⅰ~Ⅳ类储集体,并明确了走滑断裂的变形方式和规模储集体发育程度的相关性,进一步建立了不同类型储集体中钻井奥陶系碳酸盐岩储集体发育的地质模式。该地质模式不仅提升了基于应力场模拟的裂缝发育特征及多参数分布定量预测的准确性和可靠性,而且对碳酸盐岩储层裂缝发育的控制因素的定性或定量研究、规模储集体发育指标的构建以及单井储集体发育的地质模式的建立、对碳酸盐岩储集体的勘探与开发进程的加快,具有重要的参考价值。

M油田碳酸盐岩裂缝研究与含水动态分析

M油田为陆上推覆构造背景下的白垩系厚碳酸盐岩储层。复杂的生产历史及微裂缝的发育导致水淹规律比较复杂,因而在后续开发方案动态调整中,需要准确判别开发过程中水淹规律以及水进趋势。利用三维地震多方位角数据分析预测储层裂缝,结合目标地层构造形态与受力变形特征,分析地层裂缝参数以及应力场空间分布,研究储层裂缝发育特征,综合解释碳酸盐岩油藏内部流体运移方向与水驱强弱关系,判别开发过程中油田的水淹规律以及水进趋势。生产动态分析表明,目标储层内注入水流动趋势和水驱速度主要受井点周边的裂缝发育程度和裂缝方向控制。基于对地震各向异性和构造应力场的综合裂缝分析研究,明确了目标层段的裂缝发育强弱、裂缝方向和裂缝联通特征,对各个注水井的不同效率做了进一步解释。如果注水井位于裂缝不发育的区域或水进与裂缝方向垂直,水驱速度则比较稳定,周边受效井效果比较好;反之,受效井含水上升就比较快。裂缝发育特征与含水动态关联分析为后续井位的调整与开发方案的优化提供了具体指导。

2018年台湾海峡6.2级地震前地震活动及应力状态研究

通过对2018年台湾海峡6.2级地震震中及邻区地震活动、小震震源机制解、地震视应力等资料进行综合分析,研究了6.2级地震前区域地震活动及应力状态特征,结合大陆和台湾岛GPS测量资料的分析,探讨岛陆两地相对运动对区域应力场等的影响.结果表明:(1)地震前5年起上述区域地震活动明显由弱转强,中小地震及震群活动由海域逐步向粤闽赣湘交界广泛扩散,表明地震活动增强可能是较大范围应力场增强所致;(2)震源机制和应力场的分析表明,区域应力场呈现拉张(震前15年)-挤压(震前5年)-拉张(震前半年)的演化特征;地震视应力计算结果同样显示震前5年开始区域应力水平快速大幅上升并持续至临震前半年转为下降;(3)GPS基线长期观测表明台湾岛相对大陆存在年度"分离-相聚"交替运动,6.2级地震前两岸经历了"分离-相聚-分离"2次明显的倒转运动,运动方式倒转时间与应力场及地震活动变化存在准同步性.分析认为台湾海峡及粤闽赣湘交界等区域应力状态及地震活动可能主要受制于两岸相对运动方式,台湾岛震前持续近5年朝大陆挤压造成区域应力持续增强可能是导致6.2级地震以剪切破裂方式发生的直接因素.菲律宾海板块位于台湾岛东部的动力触角作用可能是造成台湾岛相对大陆往返运动最主要的驱动力.

白鹤滩水库蓄水前后邻区地震活动与应力场变化特征

水库诱发地震是水利水电工程和区域构造稳定性研究的重要内容.白鹤滩水库位于金沙江下游河段,地处小江断裂、则木河断裂和大凉山断裂等多条大型断裂交汇区域,属于地震高烈度区.2021年4月6日白鹤滩水库开始蓄水,本文利用小江断裂带中北段巧家台阵2020年1月—2021年12月地震记录,确定了水库邻区11477个地震事件,采用广义极性振幅技术反演获得了1.5级以上地震震源机制解654个.对水库蓄水前后地震活动和震源机制解分布特征的分析表明:整体而言研究区地震活动时序与水库水位密切相关,水位抬升时地震活动增强,水位维持不变或回落时,地震活动减弱,白鹤滩水库蓄水约6个月后,地震数量基本恢复至蓄水前平均水平.沿水域线附近主断裂带区域,蓄水后地震活动显著增强,数量和震级增大,深度减小,蓄水前地震类型以走滑为主,蓄水后以正断层为主;主断裂带以外以及距离水域线较远的某些区域,蓄水后地震活动受到抑制.基于震源机制解,采用区域应力场阻尼反演方法计算获取了研究区应力场时空分布,结果显示主拉应力轴方向稳定,随时间波动很小,主压应力轴方向随时间波动较大,尤其位于大坝附近的主断裂带交汇区域,蓄水前应力场为走滑型,蓄水后应力场变为正断型.这些结果揭示了水库诱发地震活动和应力场改变的更多细节特征,可进一步为水库诱发地震危险性评估提供重要参考.

渝东南彭水地区页岩储层构造应力场模拟解析

渝东南彭水地区自中新生代以来,构造变形作用复杂,精细解析古构造应力场的方向与构造演化时序,对彭水地区地应力进行定量表征,对整个彭水地区甚至整个渝东南地区页岩气的勘探和开发都具有重要的指导意义。通过对彭水地区以及周缘野外节理和断层擦痕进行统计分析处理,结合流体包裹体均一温度和磷灰石定年方法,重建研究区古构造应力场演化过程。同时,应用Abaqus对五峰组-龙马溪组页岩储层两期古构造应力场的应力值进行了定量计算。结果表明,渝东南彭水地区主要经历了两期构造作用,中燕山期,受到江南隆起SE-NW的递进扩展作用;晚燕山期-喜马拉雅期,青藏高原的隆升在研究区引起NE向的挤压。构造应力场数值模拟显示,最大主应力的高值区主要分布在向斜核部、断裂带末端和断层交汇处。应力数值模拟是研究裂缝发育程度以及深层压裂效应的基础,能够有效提高钻探的成功率。

锦屏一级水库蓄水前后地震活动、震源机制及应力场研究

本文研究了锦屏一级水库蓄水前后发生在库区及其周围M_(L)0.5以上的地震活动并进行了精定位,反演了M_(L)3.0以上71个地震事件的震源机制解,并通过计算比较了蓄水前后的应力场。结果表明:锦屏一级水库地震开始响应时间较长,应与第一阶段水位抬升有限,库水淹没范围尚未覆盖震群附近有关。淹没范围扩大至震群所在区域后地震活动大幅增加,之后几个阶段的蓄水过程和地震活动变化有较好的对应关系。蓄水后大量地震集中发生在木里藏族自治县葫芦沟附近,震源深度集中在6~14 km,与蓄水前相比震源深度变浅。除葫芦沟以外的区域震源机制解结果,P、T轴分布及区域应力场反演结果都与之前的研究结果相一致。葫芦沟附近震群的震源机制多为走滑型,P轴以NS向及NNW—SSE向为主,T轴以EW向及NEE—SWW向为主,区域应力场最大和最小主应力轴近水平,中间应力轴近直立,R值为0.5,与其他区域存在差异,其发震机制应受孔隙压扩散和水浸润弱化作用影响。

山西沁水盆地中、南部现代构造应力场与煤储层物性关系之探讨

山西沁水盆地中、南部下二叠统山西组主煤储层现代构造应力场主应力差增大,煤储层渗透率梯度呈指数形式增长,煤储层压力梯度呈对数增长,这种规律主要受控于现代构造应力场主应力方向与煤储层天然裂隙优势发育方向之间的相互关系。这两组方向对于煤储层来说近于平行,对煤储层顶板则表现为近于正交,由此导致主煤储层中天然裂隙处于相对拉张状态,而其顶板天然裂隙处于挤压状态,主应力差越大,相对拉张(挤压)效应就越显著。基于这种规律和控制机理,预测渗透率大于1md的山西组主煤储层可能分布于盆地内的阳城、潞城与沁源之间地带、武乡与左权之间地带以及左权西北方向的局部地区。

煤层气成藏的构造应力场研究

构造应力场是控制煤层气成藏极为重要的因素,深入探讨不同性质构造应力场对煤储层的改造及控制机理,将会为煤层气勘探前景评价提供重要的理论基础.本文在区域构造应力场研究的基础上,分别探讨了不同性质构造应力场的作用特征及其对构造发育、构造展布、构造组合及构造变形的控制作用;分析了不同性质构造及其组合、应力-应变环境对煤储层的改造作用,探讨了不同变形机制和不同结构构造煤在不同构造应力场中的发育及展布规律.研究表明,挤压应力场作用下,在强变形带的中心及其附近,可以形成糜棱煤类构造煤,但糜棱煤分布较为局限;在较大范围内形成脆性变形系列的构造煤,是煤层气勘采的有利区带;拉张构造应力场中,大部分区域内有利于煤层裂隙的形成和渗透率的提高,但易造成煤层气的散失,含气量降低,应重视有利的储气构造的研究.剪切构造应力场中,以平移断层为界,煤层的赋存状态、煤体结构和煤储层物性都会存在一定的差异,应对不同的构造单元分别研究其煤储层特征.

南北地震带震源机制解与构造应力场特征

南北地震带作为中国大陆地应力场一级分区的边界,其构造应力场的研究对理解大陆强震机理、构造变形和地震应力的相互作用具有重要意义.本文收集南北地震带1970—2014年的震源机制解819条,按照全球应力图的分类标准对震源机制解进行分类,发现其空间分布特征与地质构造活动性质比较吻合.P轴水平投影指示了活动块体的运动方向,T轴水平投影在川滇块体及邻近地区空间差异特征最为突出,存在顺时针旋转的趋势.南北地震带的最大水平主应力方向具有明显的分区特征,北段为NE向走滑类型的应力状态,中段为NEE—EW—NWW向的逆冲类型,南段为SE—SSE—NS—NNE向走滑和正断类型,在川滇块体的北部和西边界应力状态为EW—SE—SSE的正断层类型,表明来自印度板块的NNE或NE向的水平挤压应力和青藏高原物质东向滑移沿大型走滑断裂带向SE向平移的复合作用控制了南北地震带的岩石圈应力场.川滇块体西边界正断层类型应力状态范围与高分辨率地震学观测得到的中下地壳低速带范围基本吻合,青藏高原向东扩张的塑性物质流与横向边界(丽江—小金河断裂带)的弱化易于应变能的释放,在局部地区使NS向拉张的正断层向EW向拉张正断层转变.反演得到的应力状态基本上与各种类型地震的破裂方式比较吻合,也进一步验证反演结果的可靠性,可为地球动力学过程的模拟和活动断层滑动性质的厘定提供参考.