塔中地区速度场建立及变速成图  

The construction of the velocity field and the varying veloc- ity mapping in Tazhong area.

作　　者：张保银[1] 孙建国[1] 黄伟传[1] 马玉春[1] 罗宇[1] 

机构地区：[1]中国石化石油勘探开发研究院西部分院,新疆乌鲁木齐830011

出　　处：《石油物探》2004年第6期608-611,共4页Geophysical Prospecting For Petroleum

摘　　要：对塔里木盆地塔中地区构造成图采用了有别于常规方法的时深转换。其主要流程是:①首先利用叠加、偏移速度精确建立三维速度场,将偏移时间域t0图转换到零偏移距时间域内;②利用叠加速度由浅至深逐层进行反演,分别反演出沿该反射层的层速度,计算并绘制出层速度平面图;③最终得到三维速度模型和零偏移距时间模型,并利用2种数据模型作时深转换。将该方法应用于塔中地区低幅度构造、岩性圈闭精细描述和研究,提高了构造成图的精度。This paper present the unconventional method to time-depth transform with the software explorer (PG2) while the structural mapping in the Ka-1 zone of the central part of Tarim Basia The main process is: 1) using the stack and migration velocity to construct the 3-D velocity field accurately, Transforming the figure of shifting time domain to into the nil shifting distance time domains; 2)Inversing the interval velocity of each layer u-sing of the stacking velocity, and draw the interval velocity plot; 3) Thus getting the 3-D velocity model and the model of the zero shifting distance time domains,finally, using the two data model to time-depth transforming. This paper gives an effective method for the accurate description and studying of the low-amplitude structure and the lithology trapp, it improved the accuracy of the structural mapping.

关 键 词：塔中地区 变速成图 零偏移距 时深转换 层速度 低幅度构造 偏移速度 岩性圈闭 塔里木盆地 平面图 

分 类 号：TE122[石油与天然气工程—油气勘探] P631[天文地球—地质矿产勘探]