西南石油大学学报(自然科学版)

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Control Sedimentation Characteristics of Upper Permian Changxing
Formation in Yuanba Area and Its Control Action for Reservoir

Fan Xiaojun   

  1. Branch of Exploration Company,SINOPEC,Chengdu,Sichuan 610041,China
  • Online:2015-04-01 Published:2015-04-01

Abstract:

Changxing Formation in Yuanba is the deepest & largest marine lithologic gas field,which is characteristic of reefshoal
facies reservoir in platform margin,and the sedimentary characteristics obviously controls over the reservoir development.
Previous studies are mainly about static researches of sedimentary macro-control. Therefore the author carried out a detailed
study on the sedimentary facies division,distribution,migration,patterns and evolution through the joint research of geology,
logging and seismic,and found out that in the Yuanba Changxing Formation there have developed six kinds of sedimentary
facies,eleven sorts of sedimentary subfacies and ten sorts of microfacies,among which the platform margin reef facies and
shoal facies control the growth & development of the reef reservoir and shoal reservoir separately. The two sets of reservoirs
are mainly distributed in the reef & shoal facies of grade III sequence highstand system tract. Besides,the reservoir bears the
features of early beach and late reef in the longitudinal direction,front reef and back beach and the migration to northeast on the
lateral distribution. Under the control of sedimentary facies pattern & evolution,the reservoir growth and development patterns
can be divided into two kinds & three patterns of reef reservoirs and two kinds of shoal reservoirs. Generally,the reef reservoir
quality is better than that of the shoal reservoir and the reef zones is more favorable for enrichment and high production of oil
& gas than the shoal zones.

Key words: Changxing Formation;sedimentary characteristics;reef reservoir;shoal reservoir;oil &, gas enrichment area