Geologic-seismic models, prediction of shaol-water lacustrine delta sandbody and hydrocarbon accumulation significance in the Late Miocene, Huanghekou Sag, Bohai Bay Basin, northern China
Hao Liua,*, Qing-Long Xiab, Xin-Huai Zhouc
a School of Ocean Sciences, China University of Geosciences, Beijing 100083;
b Exploration & Exploitation Research Institute, Tianjin Branch of China National Offshore Oil Corporation, P. R. China, Tianjin;
c Exploration & Exploitation Research Institute, Shanghai Branch of China National Offshore Oil Corporation, P. R. China, Shanghai;
The Huanghekou Sag is located in the southeast part of the Bohai Bay Basin, northern China. Large-scale shallow lake delta developed in the Neogene provided suitable geological conditions for the formation of subtle oil-gas reservoirs in this area. The key for analyzing sandstone reservoir and sedimentary facies is by using seismic attributes (amplitude) to establish the relationship between lithology combination and seismic attributes. The lower unit of Late Miocene Minghuazhen Formationat of BZ34 block in the Huanghekou Sag was subdivided into 10 parasequence sets (PSS). Thicker sandstones mainly occurred in PSS1 and PSS10, whereas thin sandstones were mostly observed within other parasequence sets. Based on statistics and analyses of lithology, i.e., statistics of root-mean-square (RMS) amplitude and lithology of well locations in different parasequence sets of the study area, as well as 1-D forward seismic models of 7 types of lithology combinations, the establishment of a spatial distribution of 2-D sandbody, forward seismic models etc., we found that high amplitude peaks correspond to thicker sandbodies, while low amplitude indicates non-development of sandbodies (generally less than 2 m), and medium amplitude agrees well with large sets of mudstones interbedded with medium and thinner sandstones. Different sand-mudstone combinations genetically reflect a combination of multiple micro-facies, therefore, amplitude features can predict sandbodies as well as facies characteristics.
. Geologic-seismic models, prediction of shaol-water lacustrine delta sandbody and hydrocarbon accumulation significance in the Late Miocene, Huanghekou Sag, Bohai Bay Basin, northern China[J]. Journal of Palaeogeography, 2018, 7(1): 66-87.
. Geologic-seismic models, prediction of shaol-water lacustrine delta sandbody and hydrocarbon accumulation significance in the Late Miocene, Huanghekou Sag, Bohai Bay Basin, northern China[J]. Journal of Palaeogeography, 2018, 7(1): 66-87.
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2018, Vol. 7 
