东天山达坂城大规模层间水压碎屑岩的发现及意义
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摘要
东天山达坂城地区大规模层间水压碎屑岩发育于晚古生代裂谷沉积盆地中,受不透水层与富水层岩石组成的流体压力仓控制。通过对层间水力断裂带中水压碎屑岩与区域地质背景研究后认为,层间水压碎屑岩形成的地质条件主要包括差异压实作用、异常地温、深部热流体加入及褶皱构造诱发等因素;建立了形成水压碎屑岩的构造-流体动力作用成岩模式;层间水压碎屑岩是上地壳流体相带的地质遗迹,对认识上地壳层圈拆离、推覆构造、流体输导、多位成矿、油气运移、慢震活动及常规地震发生等问题有极重要的地质意义。
A large-size interlayer hydrofracturing clastic rocks,which were found in late-Paleozoic rift-sedimentary basin in Dabancheng region of East Tianshan Mountain,are controlled by the fluid compartments consisting of impermeable stratum and water-rich stratum.Through the studies on the hydrofracturing clastic rock formed in the interlayer hydrofracturing fault zones and the regional geological settings,this paper realizes that the geological condition forming the interlayer hydrofracturing clastic rocks include mainly differential compaction,abnormal geotherm,deep heat fluid adding and folding,etc.,builds up the diagenetic model of structural-fluidal dynamics forming hydrofracturing clastic rocks,and points out that it is the geological trace of fluid face zone in upper crust.It has vital important geological meaning in studies on crustal bed seperation,nappe structure,fluid conductivity,polytype mineralization,oil and gas movenment,slow earthquake and conventional earthquake,etc.
引文
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