摘要:
单砂体内部薄夹层因规模小、薄、不稳定、参数与分布难于确定等,致使覆盖盆地单砂体内部薄夹层及其建筑结构研究较少且难度很大,为此,本文以曲流河道沉积、建筑结构模式为指导，充分利用岩芯、测井、密井网等油田现有资料，提出了‘一整套地下曲流河道单砂体内部薄夹层建筑结构研究方法’，特别是以‘侧积泥、侧积面、废弃河道的识别、恢复、测算；河道几何学、河流工程参数计算；建筑结构理论模式为基础的‘单一侧积泥岩薄夹层建筑结构参数（倾角、倾向、规模）三类13种提取方法’及薄夹层分布密度与河道侧积轨迹研究技术,为这一难题的解决提供了可行的思路与方法。并以杏南油田PⅠ31b单元为靶区，应用该方法确定了曲流河道单砂体内部薄夹层及其建筑结构理论模式和研究区实际模式。
Abstract:
Because the interbeds in monosandbody usually are very narrow, thin, unstable, and hard to predict its attitude, scale, distribution, the researches on the underground thin interbed in monosandbody and its architecture are a few and very difficulty. This paper, taking the depositional model and architecture model of meandering channel as a guideline, fully using the core, log, closely well spacing and so on, puts forward the researching methods of thin interbed architecture of meandering channel sandbody in overburden basin, especially the three types and thirteen methods of extract architecture parameters (dip angle, dip, scale) about thin interbeds of lateral accretion mudstone, the researching methods of interbed density and lateral accretion orbit, basing on the distinguishing, restoring, measuring and calculating of lateral accretion mudstone, lateral accretion surface and abandoned channel, the calculation of the channel geometry and river engineering parameter and the theoretical model of channelsandbody architecture. To overcome this difficult problem provides feasible idea and method. Using these technique, establishes the theoretic and practical model of thin interbed architecture of meandering channel sandbody in PⅠ31b unit of Xingnan oilfield in Songliao Basin.
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