准东-帐北构造与油气预测

Zhundong-Zhangbei Structure and Its Oil-Gas Prediction

对准东隆起西缘带的现今基底及构造地貌变化、古盆山层序构造样式等分析表明,准噶尔盆地东部宽阔的盆缘山系为由南北和东西向断裂和背、向斜构成的棋盘格式构造,帐北断褶带南段是一个较典型的断弯背斜,为自西向东逆冲推覆的结果。分析帐北构造带二叠纪以来不同时期构造层的三维构造特征,认为基底南北向断裂控制了帐北斜坡带的南北向分布以及近南北向盖层次级断裂的形成;并探讨了准东-帐北断裂系统与油气运聚关系,认为近南北向断裂开启好,是一组良好的油气运移通道,提出帐北断褶带西侧斜坡区、吉木萨尔坳陷中东部、火北断裂下盘和石钱滩坳陷南部为几个有利油气区带。

It is shown that Zhundong area is a wide marginal mountain area in eastern Junggar basin, in which the chessboard-like structures formed by SN and EW faults, anticline anti syncline occur, by the analysis of the changes of present basement and tectonic topography, paleo-structures of east Junggar marginal region. The south segment of Zhangbei uplift is a typical faulted-fold belt, formed by the thrusting from west to east. The 3D structures in different stages since Permian show that the SN faults of basement control the SN distribution of Zhangbei slope and uplift as well as the sub-fauh formations in cap rocks. Based on analysis of fault systems of Zhundong- Zhangbei uplift, this paper discusses the relationship between fault systems and oil-gas accumulations in it. It is recognized that the SN fault is a good channel for oil-gas migration. Amt the several potential oil and gas traps and belts could be in the slope area of west Zhangbei faulted-fold belt, middle-east part of Jimusaer depression, footwall of Huobei fault and southern Shiqiantan depression.