东营凹陷坨123断块沙四段地震相分析

地震相是沉积相在地震剖面上表现的总和。勘探实践表明,胜坨地区沙四段是岩性隐蔽油气藏发育的有利地区,因此,在胜坨地区沙四段开展地震相分析对落实有利储层具有实际的指导意义。针对东营凹陷坨123断块沙四段的具体地质背景,在对地震剖面层序划分和追踪对比的基础上,总结出5种典型的地震相:亚平行席状地震相、丘形上超充填地震相、透镜状地震相、楔形杂乱地震相和空白地震相,并分析了其主要特征及展布范围。最后利用地震波形分类软件Stratimagic建立了Es42砂层组岩性与井旁地震道波形的对应关系,划分出Es42砂层组的波形地震相平面分布图,为东营凹陷坨123断块沙四段的有利储层预测奠定了基础。

Analysis on Es4 Seismic Facies of Fault Block Tuo 123 in Dongying Dpression

Seismic facies was the total showing of sedimentary facies in the seismic section. It was proved by exploration that the fourth member of the Shahejie Formation in Shengtuo Area was the beneficial area for subtle reservoir growth of lithology. So it was of great directory effect for analyzing seismic facies in the fourth member of the Shahejie Formation in Shengtuo Area. Based on the special geological traits of the fourth member of the Shahejie Formation of Block Tuo-123 in Dongying Depression, in combination with the sequence identification and comparison of the seismic section, five typical seismic facieses were summarized, including sub-parallel sheeted seismic facies, hummocky onlap fill seismic facies, lens seismic facies, wedge seismic facies and blank seismic facies, and their traits and distribution range were analysed. The correspondent relationship of lithology and seismic waveform of Es24 sands are built with Stratimagic, which is the software for classification of seismic waveform, and the map of plane distribution of seismic facies is divided.It provides a basis for predicting the distribution of profitable reservoir of Block Tuo 123.