塔河地区石炭系盐体对地震参数及成象精度的影响

The Effect of Salt Structure of Carboniferous in Tahe Area on Seismic Data and Imaging Accuracy

塔里木盆地塔河地区石炭系盐体覆盖面较大,约1500km2,最大厚度约270m,是塔河主力油区实行东扩的目标区。塔河油田的主力产油层为下奥陶统顶面的缝洞型储集层,而盐体位于该产油层之上,因而研究盐体对下伏地层地震参数及t0成象精度的影响就显得非常重要。为此,选择了一块最具有代表性的150km2有盐区域作为研究区,对此区块进行重新精细处理,并进行炮域、克希霍夫叠前深度偏移,研究盐岩对下伏地层构造的影响;同时对研究区内下伏地层地震反射波进行振幅、频率的提取,研究盐体对地震波运动学、动力学参数的影响。

The salt body of Carboniferous in Tahe area of Tarim basin,covering an area about 1500km 2 ,with maximum thick-ness of about 270m,is a target zone of this area toward east extending.The salt body is located on the main oil zone that be-longs to fissure-cave reservoir of Lower Ordovician in Tahe oilfield.Since it is significant for investigation of effect of this salt body on underlying strata's seismic data and imaging accuracy,the most representative area of150km 2 within salt body is select-ed as a studied area.Through detailed re-processing and shot and prestack migration,the effect of the salt on underlying forma -tion structures is studied.In addition,based on picking-up frequency and amplitude from seismic reflection event in the underly-ing formations within studied area,the effect of the salt on kinematic and kinetic parameters of the seismic wave is analyzed.