上海地区北西向断裂中流体活动和地震的关系
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摘要
由不同流体包裹体迹面 (FIP)特征和它们的穿插关系 ,划分出四次主要流体活动时期 ,计算出相应四次断裂作用的温度、压力、流体性质等热力学参数 ,差异应力、应变速率、流体势等动力学参数 ,以及裂隙间距、闭合度、渗透率等裂隙系数 .测定断裂带中石英砂岩的不同FIP裂隙糙度系数KJRC.应用分维方法 ,了解到断裂四次活动的应力性质 ,表明断裂构造应力性质从早期的压性 -压扭性到晚期的张性 -张扭性的变化 .测定不同FIP走向 ,绘出FIP走向玫瑰花图 ,了解到区域应力方向从早期NE向到晚期近EW向变化 ,显示出明显的右旋性质 .最后分析流体活动和地震的关系 ,提出北西向断裂易于地震的原故
Four times of distinct fluid activities along the Jiangyin-Changshu fault are recognized and thermodynamic parameters of temperature,pressure,fluid properties,and dynamic parameters of differential stress,strain velocity,fluid potential,as well as fissure coefficients of spacing,closing degree,permeability and so on during the four activities along the fault are calculated by means of feature of distinct fluid inclusion plane (FIP) and their intercalated relationship.We deduced the mechanical properties of the fault during the four movements,which expresses stress properties can be changed from early compressive and compressive-shearing into late tensile and tensile-shearing by taking the measure of the joint roughness coefficient K JRC of distinct FIP for quartzose sandstone in the fault zone using the fractal dimension method.By taking the measure of the strike of distinct FIP in the faulted zone,the FIP strike rose diagrams are plotted against,deducing the regional stress directions can be changed from early NE direction into late near EW direction to show clear dextral properties.Finally,the relationship between fluid activities and earthquake is analyzed and the possibility of earthquake taking along the northwest-striking fault is put forward.
Four times of distinct fluid activities along the Jiangyin-Changshu fault are recognized and thermodynamic parameters of temperature,pressure,fluid properties,and dynamic parameters of differential stress,strain velocity,fluid potential,as well as fissure coefficients of spacing,closing degree,permeability and so on during the four activities along the fault are calculated by means of feature of distinct fluid inclusion plane (FIP) and their intercalated relationship.We deduced the mechanical properties of the fault during the four movements,which expresses stress properties can be changed from early compressive and compressive-shearing into late tensile and tensile-shearing by taking the measure of the joint roughness coefficient K JRC of distinct FIP for quartzose sandstone in the fault zone using the fractal dimension method.By taking the measure of the strike of distinct FIP in the faulted zone,the FIP strike rose diagrams are plotted against,deducing the regional stress directions can be changed from early NE direction into late near EW direction to show clear dextral properties.Finally,the relationship between fluid activities and earthquake is analyzed and the possibility of earthquake taking along the northwest-striking fault is put forward.
引文
[1] 方大卫 ,沈永盛 .试论上海地震活动与北西地震带的关系 [J] .上海地质 ,1992 ,( 3 ) :1-9.
[2 ] LespinasseM ,PecherA .Microfracturingandregionalstressfield :Astudyofthepreferredorientationsoffluidinclusionplanesingranitefromthemassifcentral[J] .JStructGeol,1986,( 8) :169-180 .
[3 ] AdamsMA ,SinesG .Crackextensinfromflowsinabrittlematerialsubjectedtocompression[J] .Tectonophysics,1976,49:97-118.
[4] 刘 斌 ,沈 昆 .流体包裹体热力学 [M ] .北京 :地质出版社 ,1999.14 7-2 16.
[5 ] 何永年 ,林传勇 ,史共斌 .构造岩石学基础 [M ] .北京 :地质出版社 ,1986.110 -12 6.
[6] 陶一川 .石油地质流体力学分析基础 [M ] .武汉 :中国地质大学出版社 ,1993 .70 -93 .
[7] 谭廷栋 .裂缝性油气气藏测井解释模型与评价方法 [M ] .北京 :石油工业出版社 ,1987.1-3 5 .
[8] 庞任久 .裂隙岩体分数维结构的研究 ,地学探索 [M ] .北京 :中国地质大学出版社 ,1992 .62 -68.
[2 ] LespinasseM ,PecherA .Microfracturingandregionalstressfield :Astudyofthepreferredorientationsoffluidinclusionplanesingranitefromthemassifcentral[J] .JStructGeol,1986,( 8) :169-180 .
[3 ] AdamsMA ,SinesG .Crackextensinfromflowsinabrittlematerialsubjectedtocompression[J] .Tectonophysics,1976,49:97-118.
[4] 刘 斌 ,沈 昆 .流体包裹体热力学 [M ] .北京 :地质出版社 ,1999.14 7-2 16.
[5 ] 何永年 ,林传勇 ,史共斌 .构造岩石学基础 [M ] .北京 :地质出版社 ,1986.110 -12 6.
[6] 陶一川 .石油地质流体力学分析基础 [M ] .武汉 :中国地质大学出版社 ,1993 .70 -93 .
[7] 谭廷栋 .裂缝性油气气藏测井解释模型与评价方法 [M ] .北京 :石油工业出版社 ,1987.1-3 5 .
[8] 庞任久 .裂隙岩体分数维结构的研究 ,地学探索 [M ] .北京 :中国地质大学出版社 ,1992 .62 -68.
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