红岗北地区扶余油层河流三角洲体系高分辨率层序地层划分与单砂体等时对比

针对河流三角洲体系高分辨率层序地层划分与单砂体等时对比难点,提出区域标准等时面和局部参照等时面两个级次的层序划分与对比界面,并探讨了河流三角洲体系地层的划分与精细对比方法。依据岩心、钻井及测井等资料,将红岗北地区扶余油层划分为2个长期旋回的半旋回、4个中期旋回和20个短期旋回,建立了红岗北地区扶余油层单砂体级高分辨率层序地层格架,并在等时地层格架内完成单砂体等时追踪。层序地层分析表明,基准面的变化控制着红岗北地区扶余油层垂向沉积演化、单砂体展布规律、砂体的几何形态和储层的分布特征;扶余油层下部为基准面下降期的水退进积地层模式,中部为基准面下降期到上升期的转换时期,上部为基准面上升期的水进退积地层模式。

High-resolution Sequence Stratigraphic Division and Monosandbody Isochronic Correlation of Meandering River Delta of Fuyu Reservoir in the North of Hong gang Area

In allusion to the difficulty of high-resolution sequence stratigraphic division and monosandbody isochronic correlation of meandering river delta, regional marker chronohorizon and local reference chronohorizon were put forward, a method of stratigraphic division and finecorrelation was discussed at the same time. By using the core, drilling and logging data, Fuyuoil layer in the northern Honggang Area was divided into 2 long-term base level cycles, 4medium-term base level cycles, 22 short-term base level cycles, and monosandbody high-resolution sequence stratigraphic framework was established, monosandbody isochronic correlation wasachieved in isochronic stratigraphic framework at the same time. Through high resolution sequencestratigraphic analysis, sedimentary evolution, monosandbody distribution, sand geometry anddistribution characteristics of reservoir were controlled by base-level changes of Fuyu oil layer in northern Honggang Area. The lower Fuyu oil layer is dereliction prograding sequence stratigraphic modes in fall range of base-level. The middle Fuyu oil layer is the transition of base-level. The upper Fuyu oil layer is transgressing retrogradation sequence stratigraphic modes in the rise of base-level.