CAJ | 학술논문

以高精度三维地震资料为基础，结合深水水道成因机制和水道截面形态特征，将下刚果盆地A区块中新统深水水道分为侵蚀型、侵蚀加积型和加积型三类，并进一步细分为九种亚类。该分类体现了A区块深水水道从近源至远源方向的横向展布特征。从近源至远源，流体动力条件逐渐减弱，水道形态演化过程为限制性-非限制性-限制性-前端朵叶，水道宽深比和弯曲度均逐渐变大。通过对每个三级层序均方根振幅属性图的分析，并结合海平面升降和构造抬升作用，可见刚果扇不断由南向北迁移及向盆地方向进积，层序自下而上并由南向北，整体由加积水道和远端朵叶沉积向侵蚀加积水道和侵蚀水道沉积转变。
이고정도삼유지진자료위기출，결합심수수도성인궤제화수도절면형태특정，장하강과분지A구괴중신통심수수도분위침식형、침식가적형화가적형삼류，병진일보세분위구충아류。해분류체현료A구괴심수수도종근원지원원방향적횡향전포특정。종근원지원원，류체동력조건축점감약，수도형태연화과정위한제성-비한제성-한제성-전단타협，수도관심비화만곡도균축점변대。통과대매개삼급층서균방근진폭속성도적분석，병결합해평면승강화구조태승작용，가견강과선불단유남향북천이급향분지방향진적，층서자하이상병유남향북，정체유가적수도화원단타협침적향침식가적수도화침식수도침적전변。
Combined with high-resolution three-dimensional seismic data and the genetic mechanism of deep-water channels and the morphology of channel cross-sections at the studied Block A in Miocene Congo fan, Lower Congo Basin, it is shown that the deep-water channels can be divided into erosional, erosion-aggradational and aggradational channels, which can be further divided into nine subtypes. This classification indicates the lateral variations of these deep water channels from proximal to distal source at the Block A. From proximal to distal source, the channels display an evolutional process in morphology along with the hydrodynamic condition of these channels gradually decreases, that is, from limit, through unlimit and limit, to frontal splay, which results in the width/depth ratio and the sinuosity of the channels gradually increase. Based on the RMS amplitude diagram of per third-order sequence, considering of both sea level changes and tectonic uplift, it is claimed that the Miocene Congo fan migrates from south to north, and progresses toward the basin. The whole sedimentary sequence represent, from lower to upper and from south to north, that the aggradational channel and the distant fan are replaced by erosion-aggradational channels and erosional channels.