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火山岩断裂识别方法及其在滴西地区的应用 被引量:4
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作者 侯业伟 欧阳永林 +2 位作者 曾庆才 郭晓龙 代春萌 《科学技术与工程》 北大核心 2017年第35期222-227,共6页
火山岩储层具有"小而肥"的储集特点。与火山岩的储集特点相对应的是火山岩预测的不准确性。大量的研究表明断裂对火山岩油气藏具有较强的指示意义。通常,地球物理工作人员采用剖面预测方法对断裂进行预测。但该项技术不适于... 火山岩储层具有"小而肥"的储集特点。与火山岩的储集特点相对应的是火山岩预测的不准确性。大量的研究表明断裂对火山岩油气藏具有较强的指示意义。通常,地球物理工作人员采用剖面预测方法对断裂进行预测。但该项技术不适于火山岩的杂乱反射剖面。相干体和曲率体是目前可靠度较高的两类地震属性体。这两类数据体具有受人为干扰少的特点。基于此,采用了相干数据体和曲率数据体作为原材料,利用滴西10井区的火山岩顶作为母层,结合滴西地区的地质条件和构造史,采用层平移的方法,构建了时空格架下的断裂观测系统。在此系统下,对检测出来的不连续体属性进行判定。最后,对断裂进行分类和划分。研究结果显示,该方法的预测结果和滴西地区的所形成的地质认识基本吻合。 展开更多
关键词 火山岩断裂 观测系统 相干体 曲率体
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S-wave Q structure of the crust and upper mantle beneath Yunnan from surface waves 被引量:4
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作者 CHEN Jia HU JiaFu +3 位作者 YANG HaiYan ZHANG XiaoMan WEN LiMin PENG HengChu 《Science China Earth Sciences》 SCIE EI CAS 2012年第5期858-868,共11页
A phase-matched filtering technique is applied to extract fundamental mode signals from Rayleigh waves recorded at 62 digital seismic stations in the Yunnan and Sichuan regions.We use the fundamental mode of vibration... A phase-matched filtering technique is applied to extract fundamental mode signals from Rayleigh waves recorded at 62 digital seismic stations in the Yunnan and Sichuan regions.We use the fundamental mode of vibrations at two stations that are located on the same great circle as the focus to calculate an inter-station attenuation coefficient of the Rayleigh wave with periods between 0.40 and 80.64 s,and invert for the inter-station S-wave Q-factor (Qβ) at depths of 0-200 km.The results indicate that Qβ in Yunnan is 20-140,presenting a low Qβ background with apparent lateral variation.Taking the Honghe Fault as the boundary,Qβ of the crust is only 20 on the west side,extending to a depth of 120 km.The distribution of Qβ is consistent with large-scale Cenozoic volcanic and intrusive rocks in western Yunnan,implying that the crust and mantle are in the thermally active state.In the eastern Yunnan Block,east of the Xiaojiang Fault,Qβ in the upper 120 km is 140 in the south but only 20 in the north.Additionally,around the Dukou-Chuxiong in the mid-Yunnan Block,Qβ in the lithosphere is relatively high at 60-100,corresponding to a stiff crust.This is because the suture between the Indian and Eurasian plates reversed the tension in the rifting stage into the compression of orogenesis,leading to the closure of a gap in the crust.After some time,interstitial fluids gradually disappeared,resulting in a high velocity layer in the crust and low heat flow on the surface.The Yunnan region consists of an obvious block of elevated Qβ,distributed within the low background,consistent with the distribution of heat-flow values on the surface.The Honghe and Xiaojiang faults are tectonic boundaries in addition to being boundaries between regions of high and low crustal Qβ.The low Qβ is probably the result of crustal rupture and disturbance caused by strong earthquakes and the upwelling of hot substances along the deep fault zones. 展开更多
关键词 Yunnan region attenuation of surface wave phase-matched filtering S-wave Q-factor
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