Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (5): 73-83.doi: 10.12108/yxyqc.20200508

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

A new model for sedimentary evolution of fluvial faices based on accommodation space change and its impact on hydrocarbon accumulation: a case study of Kenli-A structure in Laizhouwan Depression

WANG Hang, YANG Haifeng, HUANG Zhen, BAI Bing, GAO Yanfei   

  1. Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Limited, Tianjin 300459, China
  • Received:2019-12-16 Revised:2020-03-05 Online:2020-10-01 Published:2020-08-08

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Abstract: In order to clarify the differential accumulation mechanism of Guantao Formation in Laizhouwan Depression,the sequence stratigraphic framework and the sedimentary evolution pattern were established by using sequence stratigraphic theories,core and well-logging analysis and seismic data,and a new model for fluvial facies reservoir characterization was proposed which emphasized the fluctuation of sedimentary base level and the change of accommodation space. The results show that:(1)The Guantao Formation was a third-order sequence,and it was divided into three system tracts including early-stage high accommodation system tract,low accommodation system tract and late-stage high accommodation system tract.(2)Three fluvial facies were recognized in the study area including anastomosing river,braided river and meandering river. Each fluvial facie indicated a distinctive system tract,and the evolutionary process of fluvial facies was affected by the change of system tracts,which resulted in the vertical and lateral distribution differences of reservoir sand bodies.(3)The sand body distribution features of different fluvial facies controlled the hydrocarbon migration and accumulation:the anastomosing river sand bodies which had well lateral connectivity and poor vertical connectivity formed structurallithologic oil reservoir;the braided river sand bodies indicated predominant superimposition with well lateral and vertical connectivity,which became effective pathway for hydrocarbon migration and accumulation in structural high position and formed structural-formation oil reservoir;the meandering river sand bodies which were surrounded by thick mudstone had poor lateral and vertical connectivity,and formed isolated lithologic oil reservoir,thus the coupling relationship of oil-migrating faults and reservoir sand bodies was crucial to hydrocarbon accumulation.

Key words: fluvial facies, accommodation space change, sedimentary evolution, hydrocarbon accumulation features, Neogene, Guantao Formation, Laizhouwan Depression

CLC Number: 

  • TE121.3
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