惠民凹陷临南洼陷滑塌浊积岩的分布规律及其控制因素

DISTRIBUTION RULES OF FLUXOTURBIDITE IN THE LINNAN SAG OF THE HUIMIN DEPRESSION AND THEIR CONTROL FACTORS

赵密福 信荃麟 刘泽容

ZHAO Mifu XIN Quanlin LIU Zerong

石油大学资源系, 山东东营 257062

Department of Resources, Petroleum University, Dongying, Shandong 257062, China

该文从临南洼陷的构造背景出发,据浊积岩的分布特征,首次系统地提出滑塌型浊积岩的形成和发育主要受洼陷带的开阔程度、沉积古地形特征、水动力条件、三角洲的规模、三角洲的高建设性(即继承性的发育程度)、三角洲体系的空间变化以及盆地演化阶段所限制。在此基础上作者认为,临商断裂下降盘的营子乡及夏103井附近可分能有浊积扇存在,在夏口断裂至营子街断裂系的宽缓斜坡上及江家店鼻状构造至玉皇庙断层附近应有小型滑塌浊积扇分布。文中还进一步指出,由于双丰三角洲的摆动性强,因此当构造等高线与三角洲的进积方向产生一定的交角时,很容易产生岩性上倾尖灭。

According to the tectonic background of the Linnan Sag and the distribution characteristics of fluxoturbidite, it was systematically advanced for the first time that the formation and development of fluxoturbidite are mainly restricted by the open degree of sag zones, the features of sedimentary paleotopography, the conditions of hydrodynamics, the scale and high constructive property (i.e. the developing degree of inheritability) of deltas, the space variation of delta systems and the evolutionary stages of basins. On this basis, the authors suggested that there maybe exist turbidite fans nearby Yingzixiang and well Xia 103 on the downthrown side of the Linshang Fracture, and there should distribute small scale of fluxoturbidite fans on the wide and gentle slope from the Xiakou Fracture to the Yingzijie fracture system and along the Jiangjiadian Nose to the Yuhuangmiao Fault. It was also pointed out that lithologic upclined pinchout will easily take place when there is a certain intersection angle between the tectonic contour and the prograding direction of the delta because of the strong oscillation of the Shuangfeng Delta.

https://doi.org/10.11781/sysydz200103267