基准面旋回对河流相储层物性差异及声波测井影响

为揭示基准面旋回对不同旋回阶段河流相储层物性差异及声波时差测井响应的影响，运用基准面旋回沉积动力学原理，对岩心分析化验数据等实测资料进行分析，对孤岛油田中一区馆陶组上段3砂层组河流相储层物性差异主控因素进行分析，明确了基准面旋回对河道微相在不同旋回阶段储层物性差异和声波测井响应的控制机理，并确定了不同级次基准面旋回内河道储层物性分布特征和声波测井响应差异.结果表明:不同级次基准面升降引起可容纳空间与物源供给条件的改变，导致不同旋回阶段河道储层沉积环境出现差异，使短期基准面旋回内部单河道内部储层物性正韵律分布、声波测井响应差异不大；中期基准面旋回中组成复合河道的多期单河道间储层物性自下向上呈总体变好趋势、声波测井响应有异；长期基准面旋回中多期复合河道间储层物性呈无规则分布、声波测井响应差异明显. 

Base Level Cyclic Controls on the Fluvial Reservoir Physical Properties and Sonic Logging Response

To identify the influence of base level cycle on the differences of the fluvial reservoir physical properties and logging response among the same type of microfacies in different stages of base level cycle, the main controlling factors on the fluvial reservoir physical properties of the channel in the upper member of Guantao Formation of Gudao oilfield are analyzed based on the sediment dynamic analysis of the high resolution stratigraphic sequence and the quantitative analysis of the core testing, statistical data. The control mechanism of base level cycle on the differences of the reservoir differences and logging response among the channel in different stages of base level cycle is identified. The pattern of the reservoir differences and logging response among the channel in different stages of base level cycle is confirmed. The results show that the diversity of sedimentary environment of channel in different stages of base level cycle causes the variation of accommodate space and sediment supply due to the changes of the base level in different scales, the reservoir quality of the upper part of the single channel in short-term base level cycle is lower than that of the basal part, and the logging response of single channel is similar. The reservoir quality of the upper part of the compound channel(formed by different single channels)in middle-term base level cycle is lower than that of the basal part, and the logging response of different single channel is distinct. The reservoir property and logging response among compound channel in the different stages of long-term base level cycle is distributed irregularly.