河流相层序地层构成模式探讨

Architecture Model of Sequence Stratigraphy in Fluvial Facies

冲积—河流相是我国中、新生代陆相盆地重要油气储集层系类型之一。由于河流相层序地层成因和相构成的复杂性 ,以被动大陆边缘地震地层学研究为基础、以三分体系域构成为地层预测模式的经典层序地层学分析方法并不一定适合河流相储层。本文以河流相沉积学研究为基础 ,运用以基准面旋回为参照面的高分辨率层序地层理论和研究方法分析了河流相层序地层单元的构成 ,建立了主要储层的地质—地震解释模型 ,并以胜利油田垦东地区上第三系馆陶组为例说明河流相层序构成特征和地质—地震解释方法。

Fluvial facies stratum is one of important reservoirs in Meso-Cenozoic continental basin in China. Sequence stratigraphy conventional sequence stratigraphy interpretation techniques based on seismic stratigraphy in passive continental margin is generally considered difficult to be applied to fluvial facies due to the sequence complexity and multiple mixed facies. The paper studies sequence architecture of fluvial strata by using high-resolution sequence stratigraphy based on base-level cycle recognition. Geological-seismic response models of fluvial reservoirs have been established, which are also illustrated by an example in Guantao Formation, Upper Tertiary, Offshore area in Shengli Oilfield.