乌石1-4构造新近系层序地层与沉积相研究
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摘要
为了研究乌石1-4构造新近系的层序地层与沉积相,我们从几口井的单井相着手分析。以小波变换、地震时频分析、测井曲线特征和垂向上岩性变化等技术方法为手段,把角尾和下洋组划分为2个三级旋回和体系域叠加样式。结果表明:凹陷主要以海侵为主要背景,角尾组和下洋组沉积末期存在两期较大的海泛面。从平面沉积相分析,下洋组到角尾组是由滨海到浅海相,主要发育滨海海滩砂和沿岸砂坝,形成了良好的储盖组合。所以落实岩性圈闭,是本区找储量的关键所在。
In order to research the sequence stratigraphy and sedimentary facies of Wushi1-4structure in neogene,we analyse from several wells phase proceed.By means of wavelet transform,time-frequency analysis of seismic,logging curves and vertical variation of lithology and other technical methods,the Jiaowei and Xiayang formation are divided into 2 levels three tracts and the different system track stacking patterns.The results show that : the sag mainly system domain is transgression,and as the main background,Jiaowei and Xiayang formation exist two larger marine-flooding surface in the terminal deposition stage.Analyzing from plan sedimentary facies,Xiayang formation to the Jiaowei formation was from shore to neritic facies,mainly grow marine beach sand and barrier bar,forming a good reservoir and cover rock combination.therefore,find lithologic trap,is the key to find reserves.
In order to research the sequence stratigraphy and sedimentary facies of Wushi1-4structure in neogene,we analyse from several wells phase proceed.By means of wavelet transform,time-frequency analysis of seismic,logging curves and vertical variation of lithology and other technical methods,the Jiaowei and Xiayang formation are divided into 2 levels three tracts and the different system track stacking patterns.The results show that : the sag mainly system domain is transgression,and as the main background,Jiaowei and Xiayang formation exist two larger marine-flooding surface in the terminal deposition stage.Analyzing from plan sedimentary facies,Xiayang formation to the Jiaowei formation was from shore to neritic facies,mainly grow marine beach sand and barrier bar,forming a good reservoir and cover rock combination.therefore,find lithologic trap,is the key to find reserves.
引文
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[5]李思田,潘元林,陆永潮,等.断陷湖盆隐蔽油藏预测及勘探的关键技术——高精度地震探测基础上的层序地层学研究[J].地球科学,2002,5(27):592～598.
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