Development characteristics and controlling factor analysis of the Neogene Minghuazhen Formation shallow water delta in Huanghekou area, Bohai offshore basin
1 Shenzhen Branch of China National Offshore Oil Corporation, Shenzhen, P. R. China; 2 School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China; 3 Exploration & Exploitation Research Institute, Tianjin Branch of China National Oil Corporation, Tianjin, P. R. China
Abstract 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 control factors of shallow water delta sandbody. An obvious meandering fluvial delta system developed in the 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 and sandbodies contacted with each other in a lateral stacking pattern and characterized by a fan shape in plain view. Distributary channels gradually narrow and tend to shift and change during the mid- late-period of base level rising, while the sandbodies are characterized by a mesh shape in plain view. During the period of base level slow falling, the multistory/multilateral channel sandbodies dominated the inner delta front of shallow-water delta and the delta sand dispersal in the plain distributes as a lobe shape.
. Development characteristics and controlling factor analysis of the Neogene Minghuazhen Formation shallow water delta in Huanghekou area, Bohai offshore basin[J]. , 2019, 8(3): 251-269.
. Development characteristics and controlling factor analysis of the Neogene Minghuazhen Formation shallow water delta in Huanghekou area, Bohai offshore basin[J]. Journal of Palaeogeography, 2019, 8(3): 251-269.
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2019, Vol. 8 
