【摘要】 通过对研究区下白垩统南屯组沉积时期重矿物组合、砂岩组合和地震反射特征资料的综合研究,确定了沉积物的物源方向和砂体展布特征。研究发现同生断裂组合对砂体起到了分散及阻挡的作用,根据同生断裂的组合以及与砂体的制约关系,划分出掀斜型阶梯状、未掀斜型阶梯状和极性3种类型的控砂断裂组合。并根据物源特征和砂体展布特征,将控砂断裂组合分为"横向砂体"和"纵向砂体"2种砂体展布类型;综合各类断裂组合对砂体的控制作用,总结出"诱导型"和"遏制型"两种控砂机制模式。本次研究对在断陷湖盆开展构造对沉积控制作用及分散机制研究提供一个实例。更多还原

【Abstract】 The source direction and sand distribution characteristics of Nantun Formation are concluded by heavy mineral analysis,isopach maps of sandstone and seismic reflection in Tanan depression.The study result shows that the fault system played a role in scattering and blocking of the sediments.According to the relationship between the fault assemble and sandstone distribution characteristics,the fault assemble can be divided into three types,"tilting ladder type","non-tilting ladder type",and "polar type".Based on the source and sand distribution characteristics,the fault assemble can be divided into "horizontal sand type"and "vertical sand type".To integrate the faultassemble control effect on sand distribution,the two models of sand control mechanism can be concluded,"induced model"and "contained model".This study provides a typical example for the research on the structurally controlled deposition and sand disperse machanism in a rift basin.更多还原