CAJ | 학술논문

地震过程中相当可观的一部分能量消耗于裂隙的活化与形成，来自汶川地震断裂带科学钻探一号孔（WFSD-1）的随钻流体表明，地震新形成的裂隙对应有较强的流体异常，它们为流体的入侵提供了良好的通道。随钻流体呈非对称性分布于主滑移面的两侧，主要的流体异常带集中在主滑移带下方须家河组顶部120 m范围内，该带中气体的含量以及变动的频率明显高于上部相同的宽度范围以及下部沉积岩层，来自地球物理测井的资料同样显示这一带破碎严重并伴随有大量水的侵入，暗示汶川地震形成的裂隙具有非对称性分布的特征。这一特征可能同时受控于断裂上盘彭灌杂岩与下盘须家河组岩层的力学性质差异以及地震破裂过程中形成的非对称性应力分布。
지진과정중상당가관적일부분능량소모우렬극적활화여형성，래자문천지진단렬대과학찬탐일호공（WFSD-1）적수찬류체표명，지진신형성적렬극대응유교강적류체이상，타문위류체적입침제공료량호적통도。수찬류체정비대칭성분포우주활이면적량측，주요적류체이상대집중재주활이대하방수가하조정부120 m범위내，해대중기체적함량이급변동적빈솔명현고우상부상동적관도범위이급하부침적암층，래자지구물리측정적자료동양현시저일대파쇄엄중병반수유대량수적침입，암시문천지진형성적렬극구유비대칭성분포적특정。저일특정가능동시수공우단렬상반팽관잡암여하반수가하조암층적역학성질차이이급지진파렬과정중형성적비대칭성응력분포。
A considerable part of energy released during an earthquake is used to create fractures within the surrounding rocks. The real-time drilling mud gas from WFSD-1 shows that the fractures generated during the Wenchuan Earthquake coincide with large fluid peaks, and hence they are favorable passages for underground fluid migrations. The drilling mud gas distributes asymmetrically around the principal slip zone (PSZ), with the major anomaly zone emerging 120 m below the PSZ. Gas concentrations are much higher and vary more intensively than the upper 120 m. Additionally, the geophysical logs also prove that this zone is highly fractured and associated with serious water inrush, suggesting that the 2008 Wenchuan earthquake caused more damage to the footwall than to the hanging wall. The difference in rock strength between the volcanic hanging wall of Pengguan complex and the sedimentary footwall of Xujiahe Formation and the asymmetric stress during the rupture propagation might have contributed to the damage process.