摘要:
本文根据露头、岩心、测井、薄片鉴定等资料,对孙吴-嘉荫盆地白垩系淘淇河组水下重力流沉积特征进行了详细的研究,认为淘淇河组水下重力流沉积规模大,为湖底扇沉积,其可进一步划分为内扇、中扇、外扇3种亚相以及主沟道、主沟道外、辫状沟道、辫状沟道间、远源浊积岩5种微相类型。内扇以水下泥石流沉积为主,中扇以液化沉积物流和浊流沉积为主,外扇发育浊积岩。根据地震剖面推断,白垩系淘淇河组时期发生的断层活动是湖底扇沉积发育的主要原因。
Abstract:
The present paper gives a detailed description of the depositional characteristics of the subaqueous gravity flow deposits from the Cretaceous Taoqihe Formation in the Sunwu-Jiayin Basin, Heilongjiang on the basis of outcrops, cores, well logs and thin section examination. The subaqueous gravity flow deposits from the Cretaceous Taoqihe Formation are interpreted as the sublacustrine fan deposits widespread in the study area, and may be subdivided into three sedimentary subfacies including the inner fan, middle fan and outer fan subfacies, and five sedimentary microfacies including the main channel, outer main channel, braided channel, braided interchannel and distal turbidite microfacies. The inner fan is blanketed by the subaqueous debris flow deposits; the middle fan is composed of the liquefied flow deposits and turbidity deposits, and the outer fan is dominated by turbidites. It is inferred from the seismic profiles that the faulting operating during the deposition of the Taoqihe Formation during the Cretaceous should be responsible for the formation and development of the sublacustrine fan deposits.
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