西南石油大学学报(自然科学版) ›› 2012, Vol. 34 ›› Issue (6): 66-72.

• 地质勘探 • Previous Articles     Next Articles

Strata Structure and Sealing Analysis for Donghe Sandstone Reservoir inTuofutai Area

Yang Shiming1，2, Sheng Haibo3   

  1. 1. MOE Key Laboratory of Exploration Technologies for Oil and Gas Resources，Yangtze University，Jingzhou，Hubei 434000，China2. Geophysics and Oil Resource Institute Yangtze University，Jingzhou，Hubei 434000，China3. Northwest Oilfield Branch Company，China Petroleum and Chemical Corporation，Urumqi，Xinjiang 834000，China
  • Received:1900-01-01 Revised:1900-01-01 Online:2012-12-01 Published:2012-12-01

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Abstract: The top structure of Donghetang Formation to the west of Tuofutaiat is Monocline structure，and there are many
low-amplitude anticlines in the local area. In this region，Donghe sandstone reservoir is primarily a dam deposits reservoir，
which is under the environment of regression by palaeo geomorphology control. Denudation pinchout happens in Devonian
Donghetang Formation strata，silurian Kepingtage Formation strata under Donghetang Formation and carboniferous Bachu
formation strata overlying Donghetang Formation. Lithology of Donghetang Formation strata and its contacting strata has a
local distribution features，structure，stratigraphic lithology and stratigraphic contact relation. These three factors caused the
characteristics of sealing for Donghetang Formation reservoir trap of roof，floor and lateral. Through the construction and the
roof and floor lithologic analysis and sealing analysis，the effective trap distribution area was found out，which has realistic
meanings to further exploitation at further exploration in the present and peripheral zones.

Key words: low-amplitude anticline, trap, unconformity surface, sealing, Donghe sandstone