松辽盆地火山岩相地震特征及其与控陷断裂的关系

在松辽盆地营城组火山岩中识别出5相15亚相。控陷断裂控制火山岩相分布，火山喷发中心沿大断裂呈串珠状分布。靠近深断裂一侧从下到上相序为喷溢相-侵出相/火山通道相，远离深断裂一侧相序为喷溢相-爆发相-喷溢相或火山沉积相；横向上相序为火山通道/侵出相-喷溢相-爆发相-火山沉积相。喷溢相呈席状披盖或丘状,中弱振幅,中频,连续性中-差,见断续波状反射，横向宽约6～10 km，纵向厚约200～400 m。爆发相呈楔状或透镜状、中强振幅、中低频、连续性差-中，横向宽约6～8 km，纵向厚约100～200 m。而火山通道相和侵出相呈(陡)丘状、中强振幅、低频、杂乱反射，仅分布在火山口附近，横向宽多小于2 km，纵向厚约100～200 m。火山沉积相呈上超充填，中强振幅，中频，连续性好，分布在低洼地区，横向宽约4～7 km，纵向厚约50～150 m。

Seismic Characters of Volcanic Facies and Their Distribution Relation to Deep Faults in Songliao Basin

Five volcanic facies and fifteen subfacies are identified in Yingcheng Formation by using the data of cores and cuts of 36 wells in the Songliao Basin. The distribution of volcanic rocks is controlled by deep-seated faults. The volcanic rocks near the deep faults are thicker than that far from deep faults. The crater is controlled by the bypass faults. The facies’ cycle of volcanic in the Songliao Basin has the following characters. The vertical facies’ cycle of volcanic near deep faults is effusive facies-effusive facies-volcanic vent facies or invading facies from lower to upper, while far from deep faults’ is effusive facies-extrusive facies-effusive facies or volcanic sedimentary facies. The horizontal facies’ rhyme is volcanic vent facies/invading facies-effusive facies-extrusive facies-volcanic sedimentary facies. The cha-racters of effusive facies are matting like overlap or mound shape, middle-lower amplitude, middling frequency, middle-bad continuum reflection, and intermittently continuum wave like reflection, which are 6～10 km wide and 200～400 m thick. The characters of extrusive facies is wedge or lentoid figure with middle-high amplitude, middle-low frequency, bad-middle continuum reflection, which are 6～8 km wide and 100～200m thick. The characters of volcanic vent facies and invading facies are steep mound shape with middle-high amplitude, low frequency, disorder reflection, only occurred near the crater, which are 2 km wide and 100～200 m thick. The character of volcanic-sedimentary facies is filling structure, middle-high amplitude, middle frequency and good continuum reflection, distributed in bottomland, which are 4～7 km wide and 50～150 m thick.