ZHAO Shijie, FU Qiang, LUO Weifeng, et al. Sedimentary characteristics of sandy beach-bar in faulted-lacustrine-basin,Ef3 in west slope of Qintong Sag[J]. Petroleum Reservoir Evaluation and Development, 2021, (2): 114-121.
ZHAO Shijie, FU Qiang, LUO Weifeng, et al. Sedimentary characteristics of sandy beach-bar in faulted-lacustrine-basin,Ef3 in west slope of Qintong Sag[J]. Petroleum Reservoir Evaluation and Development, 2021, (2): 114-121. DOI: 10.13809/j.cnki.cn32-1825/te.2021.02.016.
Sedimentary characteristics of sandy beach-bar in faulted-lacustrine-basin,Ef3 in west slope of Qintong Sag
Taking the sandy beach-bar deposit in the 3rd member of Funing formation(Ef
3
) in the "west slope zone of Qintong sag as the research object
based on core
logging and various analysis test data
the sedimentary characteristics and sedimentary dynamic conditions of the sandy beach-bar are analyzed comprehensively
the genetic types of sandy beach-bar have been divided and the main controlling factors under spatiotemporal conditions have been summarized.The research suggests that the sandy beach-bar deposits can be further divided into beach sand
and bar sand
and they have great differences in lithology
color
thickness
particle size and sedimentary structure.According to the analysis of the sedimentary dynamic conditions for the formation of sandy beach-bar
the sedimentary genetic types of sandy beach-bar in the western slope belt can be divided into two types:①the redeposited sandy beach-bar in front or side margin of far source delta
②near-shore sandy beach-bar controlled by near-source alluvial fan.The former is found in each sand group of Ef
3
and most widely distributed in Ef
3
4
sand group.The latter is only found in Ef
3
4
sand group
which is restricted to the southeast coast of the " west slope and developed in belts.The study of sedimentary characteristics of sandy beach-bar in continental faulted lacustrine basin is of theoretical significance for the exploration and development of lithologic oil and gas reservoirs in thin interbedded lacustrine facies.
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Related Institution
College of Marine Science and Technology, China University of Geosciences(Wuhan)
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School of Earth Resources, China University of Geosciences(Wuhan)
Sinopec East China Oil & Gas Company
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