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

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.