吐哈盆地台北凹陷中部地区喀拉扎组一段震积岩的发现及其地质意义
发布时间：2019-06-20 04:07
【摘要】：吐哈盆地是具有双重基底与前陆结构的多旋回复合盆地。晚侏罗世的燕山运动控制和影响着喀拉扎组的沉积作用。通过20余口钻井的岩心观察,首次在胜北-红连地区上侏罗统喀拉扎组一段中识别出多种地震成因的软沉积物变形构造,包括液化作用成因的砂岩脉(墙)、液化角砾岩、液化卷曲变形、球-枕构造、液化均一层和负载构造;水塑性变形成因的纹层卷曲变形、丘-槽构造、环形层和振动滑塌;脆性变形成因的震积角砾岩、阶梯状微断层和"V"字型地裂缝。依据仅在喀拉扎组一段中识别的震积岩变形特征,建立了震积岩垂向序列,表明研究区在喀拉扎组一段沉积期,受频繁而强烈地震事件的影响。详细对比了震积岩在各口钻井中的时空分布规律,地震强度从北部山前带的胜北地区到南缘的红连地区有减弱的趋势,表明古地震的震源来自博格达造山带。Dickinson三角投点图也显示喀拉扎组一段砂岩的物源主要来自北部的博格达山造山带。震积岩的大量发育表明,燕山运动Ⅱ幕导致博格达山于晚侏罗世喀拉扎组一段沉积期发生了剧烈的构造隆升,该地区的发现的大量震积岩是盆-山关系的特殊沉积响应。
[Abstract]:Turpan-Hami basin is a multi-cycle composite basin with double basement and Foreland structure. The late Jurassic Yanshan movement controlled and affected the sedimentation of Karaza formation. Through core observation of more than 20 drilling wells, for the first time, a variety of seismic soft sediment deformation structures have been identified in the first member of the Upper Jurassic Karazar formation in Shengbei-Honglian area, including liquefaction sand veins (walls), liquefied breccia, liquefaction crimping deformation, ball-pillow structure, liquefaction homogeneous layer and load structure, and hydroplastic deformation caused by grain curl deformation, hill-trough structure, annular layer and vibration collapse. Seismic breccia, stepped microfaults and V-shaped ground fissures caused by brittle deformation. According to the deformation characteristics of seismic rocks identified only in one member of Karaza formation, the vertical sequence of seismic rocks is established, which indicates that the study area is affected by frequent and strong seismic events in the sedimentary period of Karaza formation. The temporal and spatial distribution of seismic rocks in each drilling is compared in detail. The seismic intensity tends to weaken from Shengbei area in the northern Piedmont zone to Honglian area in the southern margin, indicating that the source of the paleo-earthquake comes from the Bogda orogenic belt. The Dickinson trigonometric projection map also shows that the provenance of the sandstone in the first member of the Karazar formation mainly comes from the northern Bogda orogenic belt. The large development of seismic rocks shows that the Bogda Mountains underwent a severe tectonic uplift during the sedimentary period of the Karaza formation in the late Jurassic due to the second act of Yanshan movement, and a large number of seismic rocks found in this area are special sedimentary responses to the basin-mountain relationship.
【作者单位】： 北京大学地球与空间科学学院石油与天然气研究中心;成都理工大学沉积地质研究院;中国石油吐哈油田公司勘探开发研究院;
【基金】：国家自然科学基金青年科学基金项目(41602107) 成都理工大学中青年骨干教师培养计划项目(JXGG201537,JXGG201538)
【分类号】：P588.2
本文编号：2502910
[Abstract]:Turpan-Hami basin is a multi-cycle composite basin with double basement and Foreland structure. The late Jurassic Yanshan movement controlled and affected the sedimentation of Karaza formation. Through core observation of more than 20 drilling wells, for the first time, a variety of seismic soft sediment deformation structures have been identified in the first member of the Upper Jurassic Karazar formation in Shengbei-Honglian area, including liquefaction sand veins (walls), liquefied breccia, liquefaction crimping deformation, ball-pillow structure, liquefaction homogeneous layer and load structure, and hydroplastic deformation caused by grain curl deformation, hill-trough structure, annular layer and vibration collapse. Seismic breccia, stepped microfaults and V-shaped ground fissures caused by brittle deformation. According to the deformation characteristics of seismic rocks identified only in one member of Karaza formation, the vertical sequence of seismic rocks is established, which indicates that the study area is affected by frequent and strong seismic events in the sedimentary period of Karaza formation. The temporal and spatial distribution of seismic rocks in each drilling is compared in detail. The seismic intensity tends to weaken from Shengbei area in the northern Piedmont zone to Honglian area in the southern margin, indicating that the source of the paleo-earthquake comes from the Bogda orogenic belt. The Dickinson trigonometric projection map also shows that the provenance of the sandstone in the first member of the Karazar formation mainly comes from the northern Bogda orogenic belt. The large development of seismic rocks shows that the Bogda Mountains underwent a severe tectonic uplift during the sedimentary period of the Karaza formation in the late Jurassic due to the second act of Yanshan movement, and a large number of seismic rocks found in this area are special sedimentary responses to the basin-mountain relationship.
【作者单位】： 北京大学地球与空间科学学院石油与天然气研究中心;成都理工大学沉积地质研究院;中国石油吐哈油田公司勘探开发研究院;
【基金】：国家自然科学基金青年科学基金项目(41602107) 成都理工大学中青年骨干教师培养计划项目(JXGG201537,JXGG201538)
【分类号】：P588.2
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