Development characteristics and controlling factor analysis of the Neogene Minghuazhen Formation shallow water delta in Huanghekou area, Bohai offshore basin  

作　　者：Li-Xin Tian Hao Liu Cheng-Min Niu Xiao-Feng Du Bo Yang Xiao-Dong Lan Dan-Lei Chen 

机构地区：[1]Shenzhen Branch of China National Offshore Oil Corporation, Shenzhen, People's Republic of China [2]School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, People's Republic of China [3]Exploration & Exploitation Research Institute, Tianjin Branch of China National Offshore Oil Corporation, Tianjin, People's Republic of China

出　　处：《Journal of Palaeogeography》2019年第3期251-269,共19页古地理学报（英文版）

基　　金：supported by the National Science and Technology Major Project(Exploration Technologies for Offshore Subtle Oil/Gas)(project no.:2016ZX05024–003-003);the Fundamental Research Funds for the Central Universities for support

摘　　要：Based on a combination of high resolution 3-D seismic, drilling and well logging and core data, this study focuses on describing the depositional features of the Neogene Minghuazhen Formation shallow water delta in Huanghekou area(HHKA), Bohai offshore basin and discussing the evolution and controlling factors of shallow water delta sandbody. An obvious meandering fluvial delta system developed in sequence 1(SQ1) of the Neogene in HHKA with thinner sandbody of distributary channels and poor development of mouth bar. The sequence texture obviously influences the vertical development and stacking pattern of sandbodies and controls the distribution of sandbodies in plain view as well. In shallow water lacustrine basins, relative topographic height difference leads to change of distribution of accommodation space, and sandbodies of distributary channels usually develop well in local low-lying areas where accommodation space increases. The delta is dominated by distributary channel sandbodies during the early period of base level rising. Sandbodies contact with each other in a lateral stacking pattern and are characterized by a fan shape in plain view. Distributary channels gradually narrow and tend to shift during the mid-late-period of base level rising, while the sandbodies are characterized by a net shape in plain view. During the period of base level slow falling, the multistory/multilateral channel sandbodies dominated the inner front of shallow-water delta and the delta sand dispersal distributes as a lobe shape.Based on a combination of high resolution 3-D seismic, drilling and well logging and core data, this study focuses on describing the depositional features of the Neogene Minghuazhen Formation shallow water delta in Huanghekou area(HHKA), Bohai offshore basin and discussing the evolution and controlling factors of shallow water delta sandbody. An obvious meandering fluvial delta system developed in sequence 1(SQ1) of the Neogene in HHKA with thinner sandbody of distributary channels and poor development of mouth bar. The sequence texture obviously influences the vertical development and stacking pattern of sandbodies and controls the distribution of sandbodies in plain view as well. In shallow water lacustrine basins, relative topographic height difference leads to change of distribution of accommodation space, and sandbodies of distributary channels usually develop well in local low-lying areas where accommodation space increases. The delta is dominated by distributary channel sandbodies during the early period of base level rising. Sandbodies contact with each other in a lateral stacking pattern and are characterized by a fan shape in plain view. Distributary channels gradually narrow and tend to shift during the mid-late-period of base level rising, while the sandbodies are characterized by a net shape in plain view. During the period of base level slow falling, the multistory/multilateral channel sandbodies dominated the inner front of shallow-water delta and the delta sand dispersal distributes as a lobe shape.

关 键 词：The NEOGENE Minghuazhen Formation Huanghekou area Bohai OFFSHORE BASIN SHALLOW water delta Micro-palaeogeomorphology Base level Sandbody STACKING pattern 

分 类 号：P[天文地球]