Characteristics of sedimentary facies of the Member 1 of Paleogene Shahejie Formation in Shenxian Sag，Jizhong Depression
Li Xianping1, Yu Xinghe2, Li Shengli2, Zhang Ruifeng1, Tian Jianzhang1, Zou Min2, Li Ruijun1, Liu Wei2
1 Institute of Geophysical Prospecting, PetroChina Huabei Oilfield Company，Renqiu 062552，Hebei 2 School of Energy, China University of Geosciences(Beijing)，Beijing 100083
Abstract：During the depositonal period of the Member 1 of Shahejie Formation，Shenxian Sag was in the end stage of rifting and beginning of sag development，where there is a obvious difference of the formation thickness, from 200 m to 1200 m.The distribution of depositional system and sedimentary facies primarily controls the exploration prospect.For this reason，based on a lot of cores observation and specific description，according to logging data and grain size analysis data，hydrodynamic environments and depositional types have been discussed，three types of sedimentary facies have been defined as following braided fluvial delta， fan delta， and lacustrine facies.By the integrated application of petrology，logging and seismic data，distribution of sedimentary facies have been reconstructed: braided fluvial deltas mainly occured in Shenze-Liucun low uplift，Shennan anticline and northeastern Ningjin uplift, and their framework was characterized by “large deltaic front and smaller plain” ，while “larger plain and smaller front” in the late period； fan deltas developed in the downthrown side of Hengshui fault，while beaches and bars mainly appeared in Baisongzhuang trough and Yuke anticline.
Li Xianping,Yu Xinghe,Li Shengli et al. Characteristics of sedimentary facies of the Member 1 of Paleogene Shahejie Formation in Shenxian Sag，Jizhong Depression[J]. JOPC, 2011, 13(3): 262-270.
