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根据陆相地层层序在地震剖面和电测曲线上的识别标志、合成记录标志以及岩石类型组合特点等方面的特征,将车排子地区新近系沙湾组划分出1个二级层序和2个三级层序。其中,层序Ⅰ为辫状河三角洲层序,层序Ⅱ为湖泊层序。又可以根据各层序的特点,将其分为3个体系域:低水位体系域、湖侵体系域和高水位体系域。针对研究区目的层段层序发育的特点,在层序地层单元划分和对比的基础上,结合构造背景和地层厚度的变化,展示了该区层序东南部厚度较大,发育完整,厚度稳定;西北部由于遭受剥蚀,厚度较小,层序发育不完整的格架特征。初步分析了层序与含油气性的关系,预测了不同层序的勘探重点和目标,认为层序Ⅰ的低水位体系域和层序Ⅱ的湖侵体系域为寻找岩性油气藏的有利部位。
According to the characteristics of terrestrial stratigraphic sequence in the seismic profile and electrical measuring curve, the composite record sign and the characteristics of rock type assemblage, we divide the Neogene Shawan Formation in Chepaizi into 1 second- Two third-level sequence. Among them, the sequence Ⅰ is braided river delta sequence, and the sequence Ⅱ is the lake sequence. According to the characteristics of each sequence, it can be divided into three system domains: low-level system tract, lacustrine system tract and high-level system tract. Based on the characteristics of sequence stratigraphic development in study area, based on the division and comparison of sequence stratigraphic unit, combining with the change of tectonic setting and formation thickness, it shows that the southeastern part of the sequence is thick, fully developed and stable in thickness ; Northwestern erosion due to erosion, the smaller the sequence of incomplete development of the grid features. The relationship between sequence and oil and gas is preliminarily analyzed, and the exploration priorities and targets of different sequences are forecasted. It is concluded that the lowstand system tract of Sequence Ⅰ and the lake invasion system tract of Sequence Ⅱ are favorable sites for searching for lithologic reservoirs .