黄骅盆地港西开发区新近系明化镇组沉积微相特征

综合利用油田开发区岩心和测井等资料，对黄骅盆地港西开发区一区l断块新近系明化镇组进行沉积微相研究。结果表明，明化镇组为中一高弯度曲流河沉积，沉积微相单元可以细分为主河道、支河道、河间溢岸沉积、废弃河道和泛滥平原等，不同的微相单元在测井曲线上具有较好的电性响应特征。在总结沉积微相发育模式的基础上，认为在高可容纳空间体系阶段，孤立的条带状河道砂体镶嵌在大面积分布的河间及泛滥平原细粒沉积背景当中，河道砂体被泥岩所分隔；而在低可容纳空间体系阶段，多层不同期次的河道砂体发生切割叠置，造成砂体厚度较大，连通性较好。垂向上，河道砂体的不同配置方式体现了A／S比值随时间的旋回性变化的控制作用。

Sedimentary Microfacies Characteristics of Neogene Minghuazhen Formation in Gangxi Development Area of Huanghua Basin,East China

Data of cores and well logs are integrated to study sedimentary microfacies characteristics of Neogene Minghuazhen Formation in the I -1 Fault-Block of Gangxi development area in Huanghua basin. The results show that Minghuazhen Formation is the deposits of a medium to high-sinuosity meandering river sedimentary system, in which main channel, distributary channel, interfluvial overbank, abandoned channel and flood plains could further be distinguished and mapped. The different microfacies units could be corresponded to obvious well log features. Based on the planar distribution characteristics of sedimentary microfacies, two depositional models of high and low accommodation systems stages could be constructed for Minghuazhen Formation. For the high accom- modation systems stage, isolated ribbon channel sandstones are sparsely distributed in a large area of flood plains mainly composed of fine sediments, which leads to separation of channel sandstones by interfluvial mudstones. In contrast, for the low accommodation systems stage, multi-storey channel sandstones are truncated and overlaid, which results in the large thickness and good continuity. In the vertical direction, the different stacking patterns of channel sandstones reflect controlling of cyclic changes of A/S ratio over time.