滨县凸起南坡沙四段扇三角洲与滩坝边界识别方法研究

Study on Boundary Recognition Method of Fan Delta and Beach Bar in the South Slope of Binxian Uplift

基于地震相及测井相的分析,结合岩矿特征提出了扇三角洲与滩坝边界的识别方法。研究表明,扇三角洲主体以杂乱或透镜状反射为主,而扇三角洲前缘被改造的席状砂与滩坝均为仅空白反射。扇三角洲与滩坝的测井相差异明显,滩坝砂体受到湖浪改造作用强烈,泥质含量少,电性曲线较为光滑对称,指状特征明显,而扇三角洲前缘分流河道砂主要表现为箱型或齿化箱型特征。

Based on the analysis of seismic facies and logging facies,and combined with the characteristics of rock and ore,a method to identify the boundary between fan delta and beach dam was proposed.The study shows that the main body of the fan delta is disordered or lenticular reflection,while the sheet sand and beach bar in the front of the fan delta are blank reflection.There are obvious differences between the logging facies of the fan delta and the beach bar.The beach bar sand body is strongly transformed by the lacustrine wave,with less argillaceous content,smooth and symmetrical electric curves and obvious finger shape characteristics,while the distributary channel sand at the leading edge of the fan delta is mainly characterized by box-type or toothed box-type.