“亮点”问题研究及其在东营凹陷周边浅层气勘探中的应用

A REVIEW OF "BRIGHT SPOT" AND ITS APPLICATION TO SHALLOW GAS PROSPECTING AROUND DONGYING DEPRESSION

胜利油田地调处

Geological Survey Dept., Shengli Oilfield

本文从分析普通声波测井存在的假象入手,研究了东营凹陷中浅层泥砂岩地层在压实作用控制下其速度和反射系数的变化待点,纠正了过去曾认为本区含气砂岩在反射地震剖面上属“暗点”型的认识。在此基础上,总结出一套在普通地震剖面和特殊处理剖面上识别气层“亮点”反射特征的方法。在陈家庄、单家寺、广饶等地区发现了大量的浅层含气砂体,并经多口井证实,取得了良好的效果。

Starting with analyzing the false appearence existing in conventional acoustic logging, a study is made with respect to the variation characteristics of velocity and reflection coefficient of shallow mudstone-sandsfone formation in Dongy-ing depression under compaction process. And the misconception, the gas bearing sandstone of this area is categorized to "Dim spot" has been put right. Based on which a series of tricks enabling to recognize the "Bright Spot" reflection characteristics of gas bearing formation from the normal seismic section and special processing section are given thru, summing up. A large amount of shallow gas bearing sandbodies have been discovered at Chenjiazhuang, Shanjiashi and Guangrao regions, which are verified by a number of wells. An appreciable result is achieved.