江汉油田储层地震反演结果解释中的几个关键问题

SOME KEY QUESTIONS IN THE INTERPRETATION OF RESER-VIOR SEISMIC INVERSION RESULTS IN JIANGHAN BASIN

以江汉盆地蚌湖地区隐蔽油气藏的预测为例,说明了在反演结果的解释过程中应该注意的问题:如何判别反演结果的正确性,如何将反演得到的波阻抗等数据体转换成储层厚度平面图和储层物理性质变化平面图,如何通过反演结果识别岩性圈闭,如何通过反演结果区别波阻抗相同的不同地质体;提出可以通过波阻抗剖面和地震剖面叠合等方法来检验反演结果的正确性;在过滤砂岩过程中,对过滤门槛值进行压实校正等一系列的处理可以得到合理的砂岩等厚度平面图;通过砂岩等厚度平面图与构造图的叠合来圈定隐蔽油气藏的范围,在解释过程中通过对几个主要问题的解决,取得了比较好的效果,并获得了高产油流。

Seismic inversion technique has been applied to every stage of petroleum exploration,in particular,for lithological deposits. This work is a systemic project which connects effectively researches of geology,log and seismic,but the interpretation of inversion results is simplified in actual application.However,inversion results can not be applied effectively. For there are some questions,such as,How to judge the effect of inverse results?How to get the isopachous map from impedance data?How to indentify lithologic traps?How to separate different geologic beds with same impedance value? On such account,this paper focuses on some of key questions which must be paid attention to in the interpretation of inversion results. That is exampled by prediction of subtle reservoir in Jianghan Basin.