摘要
基于高分辨率层序地层格架的沉积微相特征与演化分析是油气储层沉积学研究中的一个重要问题.利用22口取心井岩心资料和830口井的录井、测井资料,通过对各级次基准面旋回精细划分与对比,建立了高分辨率层序地层格架,并在等时地层格架内分析沉积微相特征及演化.研究表明,扶余油层Ⅰ砂组可划分为1个中期基准面旋回、5个短期基准面旋回.中期起基准面的升降变化控制沉积微相的空间演化.早期的基准面缓慢上升阶段发育高可容纳空间条件下形成的分流河道复合体,中期的基准面快速上升阶段发育中高可容纳空间条件下的沉积特征,沉积微相类型增多,A/S变化的不均一性造成沉积特征发育差异性,晚期的略有下降阶段发育中低可容纳空间条件下的沉积特征,水下分流河道和河口坝(或叠置的席状砂)较发育,但规模较小.
Analysis of sedimentary microfacies characteristics and its evolution based on high-resolution sequence stratigraphic framework are an important issue in the oil and gas reservoir sedimentology. Based on 22 wells cores and 830 wells logging data, through the fine classification and correlation on all levels of base-level cycles, highresolution sequence stratigraphic framework is built and sedimentary microfacies characteristics and its evolution are analyzed in the isochronous stratigraphic framework. The results show that one middle-term and about five shortterm base-level cycle sequences from I sand beds of Fuyu oil layer are classified. The sedimentary microfacies evolution is influenced by the rising and falling of the medium-term base-level. In the early raise slowly stage, the distributary channels under the condition of high accommodation space are a lot. In the middle raises quickly stage,sedimentary features under the condition of medium-high accommodation space begin to appear. The types of sedimentary microfacies are increased. The heterogeneity of A/S changes result in the development of sedimentary characteristics. In the end fall slightly stage, sedimentary features under the condition of medium-low accommodation space begin to appear. The underwater distributary channel and the river mouth bar are increased, but the scale is small.
出处
《河南科学》
2016年第12期2038-2043,共6页
Henan Science
基金
国家科技重大专项(2016ZX05006-005)
黑龙江省高等学校青年学术骨干支持计划项目(1254G003)
油气资源与探测国家重点实验室开放基金(PRP/open-1405)
关键词
高分辨率层序地层
河控三角洲
沉积微相
扶余油层
松辽盆地
high-resolution sequence stratigraphy
fluvial-dominated delta
sedimentary microfacies
Fuyu oil layer
Songliao basin
