西南石油大学学报(自然科学版)

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Fracture Characteristics and Petroleum Geological Significance of
Lianglitage Formation in Shunxi Area

Ma Zhongyuan1, Huang Wei1, Ren Lidan1, Shang Kai1, Zhang Jie2   

  1. 1. Research Institute of Petroleum Exploration & Production,Northwest Company,SINOPEC,Urumqi,Xinjiang 830011,China
    2. No.1 Oil Recovery Plant,Northwest Company,SINOPEC,Luntai,Xinjiang 841600,China
  • Online:2014-04-01 Published:2014-04-01

Abstract:

Shunxi Area of middle Tarim Basin is located in the northwest pitching end of Katake uplift. Lianglitage Formation
reservoir of Ordovician is mainly fracture-cavity reservoirs. The studies show that cracks can be divided into the structural
ceacks and non structural cracks. The structural cracks can be divided into vertical fractures,oblique fractures(high angle
fractures,low angle fractures)and horizontal fractures;the non structural cracks contain pressure dissolved stitch seam fractures
and diagenetic fractures;the oblique fractures is relatively more than vertical fractures and horizontal fractures,and trend
of oblique fractures is mainly NW,NWW,followed by NE. Structural fractures have three stages of activities:late Caledonian—
early Hercynian,late Hercynian and Indosinian—Yanshan periods. Further studies show that tectonic stress field,
fracture,lithology,physical property and layer thickness is closely related to the crack. The crack growth is conteolled by local
structural high,key parts,turning point,the junction of the brittle fracture,lithology,physical property and thickness of strata.
Cracks in the area have very important significance in petroleum geology,which can not only be used as good reservoirs,and
also favorable channel and in some extent it can expand karst effect;in the oil and gas migration and accumulation process,
cracks are good oil and gas migration channel for karst effect,plays a vital role in oil and gas accumulation.

Key words: middle of Tarim Basin;Shunxi Area;Lianglitage Formation;fracture;karst effect;oil &, gas migration and
accumulation