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Chemical characteristics and geological significance of Palaeogene formationwater in central Xihu Depression，East China Sea Basin

Yang Li-jie,Hou Du-jie,Chen Xiao-dong,Diao Hu   

  1. 1.School of Energy Resources，China University of Geoscience (Beijing)，Beijing 100083,China;
    2.Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism，Ministry
    of Education，Beijing 100083,China;3.Beijing Key Laboratory of Unconventional Natural Gas GeologicalEvaluation and Development Engineering,Beijing 100083,China;4.Shanghai Branch of CNOOC，Shanghai 200030，China
  • Received:2017-12-10 Revised:2018-03-12 Online:2018-04-10 Published:2018-04-10

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Abstract:

Formation water is an important fluid coexisting with oil and gas in petroliferous basins，its chemical characteristics are of great significance to the evaluation of oil and gas preservation conditions.Reliable Pinghu-Huagang Formations water data suggest that: The total dissolved solid (TDS) is low，with average of 21657.37mg/L.Na++K+，Cl-，HCO-3are dominant ions and water type is mainly NaHCO3 type，r(Na+)/r(Cl-)，r(SO2-4)×100/r(Cl-)，and r(Mg2+)/r(Ca2+) are high，and r(Cl--Na+)/r(Mg2+) is low.These characteristics reflect weak concentration and deterioration of formation water and it is in half open-half close regional hydrodynamic slow alternation zone.Except the evaporation and concentration of freshwater-brackish water of lake basin，the source of formation water also has salinization that seawater along the open structure infiltrates into synsedimentary water of underlying strata.Halite dissolution is mainly origin of Na+ and Cl-，kaolinization of albite makes important contribution to HCO3- formation.There are close relations between chemical compositions of the formation water and natural gas reservoirs.While the formation water is of low TDS(<25 000mg/L)，NaHCO3 water type，low r(SO2-4)×100/r(Cl-) (<8)，low r(Mg2+)/r(Ca2+) (<1.5) and r(Na+)/r(Cl- ) is at 1-1.6，r(Cl--Na+)/r(Mg2+) is from -80 to -0.5，there may be beneficial to preserve natural gas.

Key words: Formation water, Hydrochemical characteristics, Natural gas reservoirs, Palaeogene, Xihu Depression

CLC Number: 

  • TE122.1+13


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