西南石油大学学报(自然科学版)

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Characteristics of Fault Accommodation Structure Slope Break#br# Zone and the Sand Control Pattern in A Oilfield

Wang Wei1*, Fan Tingen2, Hu Guangyi2, Niu Tao2, Wang Guodong3   

  1. 1. Department of Development & Production,CNOOC,Dongcheng,Beijing 100010,China
    2. Research Institute of CNOOC,Dongcheng,Chaoyang,Beijing 100028,China
    3. Tianjin Branch of China Offshore Oil Company Ltd.,Tanggu,Tianjin 300452,China
  • Online:2015-12-01 Published:2015-12-01

Abstract:

The study finds that the faults activities are severe and complicated during Dongying Formation in A Oilfield. The
sedimentary face is expressed in delta lobes migration in the plane and superimposed sand body in the longitudinal stage,and
the thickness of formation and the degree of sand body are of strong heterogeneity. The dextral movement of main strikeslip
generated a large amount of associated faults with characteristics of transtension. The faults of different size and attitude
distributed in space form a various types of fault accommodation structure-type slope break belts,and they obviously control
the import of source and multistage dispersion to the centre of sag. Especially the formation of gap and faulted trough play an
important role in the convergence and guidance of the drainage system. Under the effects of fault accommodation structure-slope
break zone,there are two sources within the study area,and the sedimentary face of interval is deltaic environment and the delta
could be further separated into three subfacies including delta plain,delta front,former delta and many kinds of microfacies
such as distributary channel,mouth bar,sheet sand,turbidite sand and so on.

Key words: Liaozhong Sag, accommodation zones, slope-break zone, sedimentary model, Dongying Formation

CLC Number: