Sedimentation simulation experiment of braided fluvial delta of the second submember of Member 3 of Paleogene Shahejie Formation in Qikou Sag of Huanghua Depression
Wen Zhan1, Liu Zhongbao1, He Youbin1, Yuan Bochao1, Luo Jinxiong1, Pu Xiugang2, Chen Changwei2, Lin Changmei2
1 School of Geosciences，Yangtze University，Jingzhou 434023，Hubei 2 Research Institute of Exploration and Development，PetroChina Dagang Oilfield Company，Tianjin 300280
Abstract：The Shahejie Formation of Paleogene in Qikou Sag of Huanghua Depression is the main target strata of Dagang Oilfield，which is dominated by braided fluvial delta and fan delta sandbodies. The braided fluvial delta is the favorable reservoir. Based on the study of regional tectonic，palaeogeomorphology feature，sedimentary system of the study area，the formation process of the braided fluvial delta is reconstructed and the sedimentary microfacies feature are observed through using the technology of simulation experiment.The experiment shows that the braided fluvial delta from the Kongdian provenance can be divided into 3 subfacies and 7 microfacies.The systematic study on the main controlling factors of the formation and evolution of the braided fluvial delta is completed.It is proved that basement subsidence，relative lake level changes，flow and flow fluctuation，amount of adding sand and mud（sediment supply）and so on are the main controlling factors.By comparing the actual and the experimental thickness of sand body，the distribution of the favorable reservoir in the study area has been predicted. Based on the initial geological pattern and combining with the phenomena and results of the simulation experiment，the sedimentary model of the braided fluvial delta of the second submember of member 3 of Paleogene Shahejie Formation (Es32) in Qikou Sag of Huanghua Depression is set up under the experimental condition.
Wen Zhan,Liu Zhongbao,He Youbin et al. Sedimentation simulation experiment of braided fluvial delta of the second submember of Member 3 of Paleogene Shahejie Formation in Qikou Sag of Huanghua Depression[J]. JOPC, 2012, 14(4): 487-498.
