沙垒田凸起围区古近系源￣汇体系

Paleogene source-to-sink system of surrounding slope area of Shaleitian Uplift

沙垒田凸起区已经发现数亿吨原油,位于油气运移路径上的围斜坡区具有良好的勘探潜力,但储层预测成功率较低,寻找有利储层发育区带是突破的关键。文中以源-汇沉积体系理论为指导,明确了古近系研究区物源体系的岩性组成与分布,通过古地貌恢复技术还原不同时期物源输砂通道的特征、汇聚体系发育的类型与分布区域,明确了古沟谷与断槽物源通道的分布与尺度。在此基础上,总结出物源体系与汇聚体系之间不同耦合类型对沉积体系类型及展布特征的控制作用,建立了沙河街组与东营组源-汇体系耦合模式,明确了不同时期优质储层有利发育区域,为该区下一步寻找有利勘探目标提供了有力的技术支持。

Several hundred million tons of crude oil has been found the Shaleitian Uplift,so there is good exploration potential in the surrounding slope area on the oil and gas migration path.Furthermore,the success rate of reservoir prediction is low,and it is the key to find a favorable reservoir development zone.Based on the theory of source-to-sink sedimentary system,this paper made clear the lithology and distribution of the source system in the Paleogene study zone.The distribution and scale of incised valleys and fault-trough sediment-transport pathways were clarified.On this basis,the effects of different coupling types between source system and convergence system on depositional system types and distribution characteristics were summarized,and the coupling model of source-to-sink system between Shahejie Formation and Dongying Formation was established.The favorable development regions for high-quality reservoirs in different periods were also identified,which provides a strong technical support for the next step to find favorable exploration targets.