辽河盆地西部凹陷深层沉积特征及有利相带预测

Depositional Characteristics and Favorable Facies Belts Prediction of Deep Reservoir from West Depression,Liaohe Basin,China

本文以沉积学研究为基础,结合测井相及地震相井利用了多种储层预测新技术,对辽河盆地西部凹陷3500m以下深层的沉积演化史、沉积体系及沉积相进行了系统研究,揭示了深层储层的沉积特征及砂体展布规律,着重阐述了沙三段湖底扇砂体的沉积特征及分布规律。对深层储层即沙三段湖底扇砂体及沙二段扇三角洲砂体储集性能进行分析,预测有利相带,认为湖底扇中扇储层中辫状沟道和扇中前缘砂体储集性能最好。对于同样的深度,沙二扇三角前缘相砂体比沙三浊积岩砂体物性要好。

The paper has studied the sedimentary evolution history,depositional system and sedimentary facies of deep reservoir in Liaohe Basin by using sedimentology combining with log facies and seismic facies as well as various reservoir forecasting methods to reveal the depositional feature and sandbody spatial distribution of deep reservoir bed,analysed the reservoir characteristics of section Sha 3 turbidite sandbody and Sha 2 - Sha 4 fan-delta sandbody,and predicted favorable facies belts.The conclusion of the research is that sublacustrine fan reservoir is of a little high porosity and general low permeability,and the petrophysical properties of section Sha 2 fan-delta frontal reservoir is batter than that of section Sha 3 turbidity reservoir at the same depth.Finally,the sedimentry model and depositional feature of deep reservoir in west depression,Liaohe Basin has been summarized.