STUDY OF SEDIMENTARY MICROFACIESIN FINE RESERVOIR DESCRIPTION—ANEXAMPLEFROMTHEFIRST AND SECOND MEMBERS OF THE SHAHEJIE FORMATION IN THE HE－31 BLOCK OF THE XIANHEZHUANG OIL FIELD IN THE DONGYING DEPRESSION
Liu Jiaduo Tian Jingchun Li Qi Dong Wei Xu Xuebing Wang Xinzheng Wang Fujin
Institute of Sedimentary Geology of Chengdu University of Technology, Chengdu 610059
Institute of Geology of Xianhe Oil Recovery Factory, Dongying 257015
Through detailed study of the first and second members of the Shahejie Formation of the He－31 Block in the Xianhezhuang Oilfield，16 sedimentary microfacies types are recognized and their characteristics are described.Their distribution and evolution are also discussed. In the study area,delta and lacustrine sediments are developed, and with the change of lake level and sediment supplies, the delta was pushed forward or backward incessantly from northeast to southwest. Two sedimentary cycles are identified. One represents evolution from shallow lake to delta plain in the second member of the Shahejie Formation, and another from shallow lake to delta front in the first member of the Shahejie Formation. The control of the sedimentary microfacies on sandbodies devolopment，reservoir quality and intrabed heterogeneity of reservoir beds are illustrated quantitatively. The study shows that distributary channels, point bars and river mouth bars are the most favorable sedimentary facies. The characteristics of sedimentary microfacies control the macroscopic and microscopic distribution of residual oil and these research results are very useful for constructing the model of the fine reservoir description.
. STUDY OF SEDIMENTARY MICROFACIESIN FINE RESERVOIR DESCRIPTION—ANEXAMPLEFROMTHEFIRST AND SECOND MEMBERS OF THE SHAHEJIE FORMATION IN THE HE－31 BLOCK OF THE XIANHEZHUANG OIL FIELD IN THE DONGYING DEPRESSION[J]. JOPC, 1999, 1(2): 36-45.
