曲靖盆地茨营组三段Ⅳ砂组含气性的地震预测
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摘要
云南曲靖盆地目前钻有8口探井,其中两口井在新近系茨营组三段Ⅳ砂组钻到了气层,揭示出其浅层蕴藏有较丰富的天然气资源。为了提高探井成功率,利用8口探井的测井资料作为约束条件,对主要储层茨三段Ⅳ砂组进行了地震波阻抗反演;在此基础上,分析了储层岩性、速度与含气性的关系,认识到砂岩储层高波阻抗背景下的低波阻抗是储层含气的地震响应特征。该研究成果可为该盆地的浅层气勘探和提高探井成功率提供一种指向。
Among the currently drilled exploratory wells in the Qujing Basin,Yunnan Province,two wells targeted gas pay zones in Sand Group Ⅳ of the third member of the Neogene Ciying Formation,which discloses abundant natural gas resources in the shallow beds there.For increasing the success rate of exploratory wells,logging data of 8 exploratory wells were used as constraints and seismic wave impedance inversion was performed for Sand Group Ⅳ of the third member of the Ciying Formation.On this basis,through the analysis of the relationship between reservoir's lithological characters,velocity and gas bearing characteristic,it is shown that the presentation of low wave impedance under the background of high wave impedance is just the reflection of gas bearing property in the reservoir from seismic response.This provides a powerful means for prospecting shallow gas in this basin and improving success rate of exploratory wells.
Among the currently drilled exploratory wells in the Qujing Basin,Yunnan Province,two wells targeted gas pay zones in Sand Group Ⅳ of the third member of the Neogene Ciying Formation,which discloses abundant natural gas resources in the shallow beds there.For increasing the success rate of exploratory wells,logging data of 8 exploratory wells were used as constraints and seismic wave impedance inversion was performed for Sand Group Ⅳ of the third member of the Ciying Formation.On this basis,through the analysis of the relationship between reservoir's lithological characters,velocity and gas bearing characteristic,it is shown that the presentation of low wave impedance under the background of high wave impedance is just the reflection of gas bearing property in the reservoir from seismic response.This provides a powerful means for prospecting shallow gas in this basin and improving success rate of exploratory wells.
引文
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[4]张江华,王建海,林承焰.测井约束反演在牛庄洼陷浊积砂体预测中的应用[J].天然气工业,2009,29(2):49-51.
[5]张渝昌.中国含油气盆地原型分析[M].南京:南京大学出版社,1997:115-127.
[6]安鸿伟,李正文.稀疏脉冲波阻抗反演在YX油田开发中的应用[J].石油物探,2002,41(1):56-60.
[7]刘成斋,冉建斌.稀疏脉冲和基于模型反演在王家岗沙四段砂岩油藏精细勘探中的应用[J].石油地球物理勘探,2002,37(4):401-407.
[8]谢月芳,李言经,王坚勇.波阻抗反演在残雪油气田气藏描述中的应用[J].海洋石油,2003,23(3):23-28.
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