LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (5): 45-52.doi: 10.3969/j.issn.1673-8926.2015.05.008

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Characteristics and genetic mechanism of “ sweet spots ” of Shahejie Formation in BZ-A-1 well field, Huanghekou Sag

Wang Wei1, Zhang Yingbo1, Yang Xianghua1, Wang Qingbin2, Zhu Hongtao1   

  1.  1. China University of Geosciences , Wuhan 430074 , China ; 2. Tianjin Branch of CNOOC Ltd. , Tianjin 300457 , China )
  • Online:2015-09-26 Published:2015-09-26

Abstract:

 The tight reservoir of Shahejie Formation in BZ-A-1 well field in Huanghekou Sag is mainly due to carbonate cementation. However, there are relatively high quality reservoirs developed in low porosity and low permeability sandstones. The characteristics, genetic mechanism and controlling factors of the high quality reservoirs in the first and second members of Shahejie Formation were studied by the means of backscatter, energy spectrum,cathodeluminescence, X-ray diffraction and SEM. The results show that high quality reservoirs of the second member of Shahejie Formation are the sandstones with dolomite membrane. The membrane can effectively inhibit the pressure solution of the quartz and the growth of secondary quartz edge. The burial dolomitization and the dissolution by acid fluid in the late stage played an positive role in reservoir development. The evaporitic environment of semi-closed water in the early stage of the first member of Shahejie Formation led to the development of biodetritus beach in the high part. Together with the impacts of both the alkaline water and terrigenous fresh water, three kinds of high quality reservoirs deposited, including bioclastic dolostones, hunji rocks with bioclast and micrite dolomitic fine sandstones.Dolomization and dissolution are the main causes of pore development.

Key words: accumulation regularity, favorable migration and accumulation, detachment faults, eastern Baiyun Sag

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