發(fā)布時(shí)間：2019-06-20 04:07

【摘要】：吐哈盆地是具有雙重基底與前陸結(jié)構(gòu)的多旋回復(fù)合盆地。晚侏羅世的燕山運(yùn)動(dòng)控制和影響著喀拉扎組的沉積作用。通過20余口鉆井的巖心觀察,首次在勝北-紅連地區(qū)上侏羅統(tǒng)喀拉扎組一段中識(shí)別出多種地震成因的軟沉積物變形構(gòu)造,包括液化作用成因的砂巖脈(墻)、液化角礫巖、液化卷曲變形、球-枕構(gòu)造、液化均一層和負(fù)載構(gòu)造;水塑性變形成因的紋層卷曲變形、丘-槽構(gòu)造、環(huán)形層和振動(dòng)滑塌;脆性變形成因的震積角礫巖、階梯狀微斷層和"V"字型地裂縫。依據(jù)僅在喀拉扎組一段中識(shí)別的震積巖變形特征,建立了震積巖垂向序列,表明研究區(qū)在喀拉扎組一段沉積期,受頻繁而強(qiáng)烈地震事件的影響。詳細(xì)對(duì)比了震積巖在各口鉆井中的時(shí)空分布規(guī)律,地震強(qiáng)度從北部山前帶的勝北地區(qū)到南緣的紅連地區(qū)有減弱的趨勢(shì),表明古地震的震源來自博格達(dá)造山帶。Dickinson三角投點(diǎn)圖也顯示喀拉扎組一段砂巖的物源主要來自北部的博格達(dá)山造山帶。震積巖的大量發(fā)育表明,燕山運(yùn)動(dòng)Ⅱ幕導(dǎo)致博格達(dá)山于晚侏羅世喀拉扎組一段沉積期發(fā)生了劇烈的構(gòu)造隆升,該地區(qū)的發(fā)現(xiàn)的大量震積巖是盆-山關(guān)系的特殊沉積響應(yīng)。
[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.
【作者單位】： 北京大學(xué)地球與空間科學(xué)學(xué)院石油與天然氣研究中心;成都理工大學(xué)沉積地質(zhì)研究院;中國(guó)石油吐哈油田公司勘探開發(fā)研究院;
【基金】：國(guó)家自然科學(xué)基金青年科學(xué)基金項(xiàng)目(41602107) 成都理工大學(xué)中青年骨干教師培養(yǎng)計(jì)劃項(xiàng)目(JXGG201537,JXGG201538)
【分類號(hào)】：P588.2

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