伏龙泉地区浅层强屏蔽作用下的激发井深选取

Choice of the Hole Depth in the Conditions of Powerful Shielding Effect of the Shallow Layer in Fulongquan Block

伏龙泉工区位于中央凹陷区与东南隆起区的过渡带上,是吉林探区的重点勘探区块之一。从表层调查结果揭示,伏龙泉工区近地表结构十分复杂,存在高速夹层,岩性为硬质泥岩;该套地层对地震波的传播起到屏蔽作用,同时又是产生次生线性干扰波的主要因素,严重影响了地震采集资料品质的提高。通过精细的表层调查,建立精确的表层及深层地质模型,利用波动方程数值模拟正演技术,准确地选择了浅层屏蔽区的最佳井深,取得了较好的采集效果。

Fulongquan block,one of the most important geophysical exploration blocks of Jilin,lies between the center sag and southeast arched area.According to the results of surface survey,the seismic geological conditions of the near surface are complicated.And in it is high velocity interbed.Lithological composition is hard mudstone.Shielding effect of this layer affects seismic waves,and makes the secondary linearity interference wave,affects the upgrade of the seismic data.The paper is by accurate studying surface survey,establishing exactly surface and deep zone geological model and wave equation numerical forward modeling technology,to choose the right hole depth,and get a good seismic acquisition data.