Petroleum Science >2016,??Issue 3:??385-401 DOI: https://doi.org/10.1007/s12182-016-0115-4
Sedimentary characteristics and processes of the PaleogeneDainan Formation in the Gaoyou Depression, North JiangsuBasin, eastern China Open?Access
文章信息
State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu, China;State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu, China;School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, Jiangsu, China;State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu, China;State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu, China;Institute of Geological Sciences, Jiangsu Oilfield Branch Company, SINOPEC, Yangzhou 225009, Jiangsu, China
文章摘要
distribution pattern of sedimentary facies of the Paleogene
Dainan Formation in the Gaoyou Depression of the North
Jiangsu Basin are studied in detail. Results show that fan
delta, delta, nearshore subaqueous fan, and lacustrine facies
developed during the Dainan Formation period and their
distribution pattern was mainly controlled by tectonics and
paleogeography. The fan delta and nearshore subaqueous
fan facies predominantly occur in the southern steep slope
region where fault-induced subsidence is thought to have
created substantial accommodation, whereas the delta
facies are distributed on the northern gentle slope which is
thought to have experienced less subsidence. Finally, the
lacustrine facies is shown to have developed in the center
of the depression, as well as on the flanks of the fan delta,
delta, and nearshore subaqueous fan facies. Vertically, the
Dainan Formation represents an integrated transgressive–
regressive cycle, with the E2d1 being the transgressive
sequence and the E2d2 being the regressive sequence. This
distribution model of sedimentary facies plays an important
role in predicting favorable reservoir belts for the Dainan
Formation in the Gaoyou Depression and similar areas. In
the Gaoyou Depression, sandstones of the subaqueous
distributary channels in the fan delta and the subaqueous
branch channels in the delta are characterized by physical
properties favorable for reservoir formation.
关键词
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Sedimentary facies Distribution pattern Sedimentary evolution Dainan Formation GaoyouDepression North Jiangsu Basin