陆东断陷构造演化与局部构造成因探讨
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摘要
陆东断陷是松辽盆地西南隆起区的一个中生代断陷盆地，由于白垩系盖层较薄，因此是解剖断陷层构造的有利地区。通过地震反射剖面、构造平面展布与组合分析，结合区域地质与探井地质资料分析，断陷基底岩石为古生代褶皱变质岩系，盖层由侏罗系义县组、九佛堂组、沙海组与阜新组地层组成。盆地经历了沉积发展与后期改造两大发展期。同沉积断层及同沉积构造决定了断陷构造格局与沉积相带的展布。后期构造改造作用在时间上与空间上完成了构造反转过程。盆地演化的不同时期，构造特征及构造运动的方式、强度的变化对盆地周围古构造应力场的演变和基底先存构造薄弱带给予了积极的响应。构造及构造运动的差异致使断陷不同部位油气圈闭对油气富集有着显著的不同
Ludong sag is a mesozoic continential faulted depression developing the folding basement in south west Songliao basin. Structure feature shows interchange action both torsional and tensional force during its formation. Synsedimentary fault and synsedimentry tectonic movement determine the tectonic framework, type of local structure, sedimentation and sedimentary feature. The positive inverse structure is a result of later modified tectonic movement. The structure feature, the mode and strength of tectonic movement affected the factors such as framework of the basement, regional stress field in which the basin is located. So oil bearing capability of structural traps is remarkably different in different structural belts. Tilted fault block is the main type of structural trap. Later tectonic movement lifted and strengthened west local structure, but it is a destructive tectonic movement to east local structure.
Ludong sag is a mesozoic continential faulted depression developing the folding basement in south west Songliao basin. Structure feature shows interchange action both torsional and tensional force during its formation. Synsedimentary fault and synsedimentry tectonic movement determine the tectonic framework, type of local structure, sedimentation and sedimentary feature. The positive inverse structure is a result of later modified tectonic movement. The structure feature, the mode and strength of tectonic movement affected the factors such as framework of the basement, regional stress field in which the basin is located. So oil bearing capability of structural traps is remarkably different in different structural belts. Tilted fault block is the main type of structural trap. Later tectonic movement lifted and strengthened west local structure, but it is a destructive tectonic movement to east local structure.
引文
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