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综合地震、测井、钻井等资料分析 ,东营凹陷沙三段至沙一段可划分为 4个三级层序。层序 1(沙三下亚段 )和层序 2(沙三中亚段 )为T R型层序 ,由湖进域 (LTST)和湖退域 (LRST)组成 ;层序 3 (沙三上亚段—沙二下亚段 )和层序 4(沙二上亚段—沙一段 )为四分层序 ,由低位域、湖侵域、高位域和下降域组成。T R层序的湖退域砂体发育 ,也易形成油气藏 ;湖进域砂体发育很少 ,但砂体具有良好的成藏条件 ,极易形成岩性油气藏。四分层序的层序界面附近砂体发育 ,但砂体往往缺乏好的圈闭条件 ,成藏概率较低。图 3参 10
According to the comprehensive analysis of seismic data, logging data and drilling data, it can be divided into four third-order sequences from the third member to the first member of Shahejie Formation in Dongying Depression. Sequence 1 (sub-Sa 3) and sequence 2 (middle Es 3) are TR-type sequences and are composed of LTST and LRST. Sequence 3 Sub-paragraph Sha2) and sequence 4 (Sha2 Upper Member-Sha1 Member) are in four-fold sequence and consist of low-level domain, lake intrusion domain, high-level domain and descending domain. T retreat lacustrine sand body developed, but also easy to form reservoirs; lake into the field of sand body development is very small, but the sand body has good accumulation conditions, easily formed lithologic reservoirs. The sand bodies are developed in the quaternary sequence boundaries, but the sand bodies often lack good trapping conditions and the probability of hydrocarbon accumulation is low. Figure 3 Reference 10