Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (6): 1580-1588.doi: 10.13278/j.cnki.jjuese.201506102

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Characteristics of Low Permeability Reservoirs and Main Controlling Factors of High Quality Reservoirs of Chang 63 Member in Huaqing Area

Li Fulai1, Wang Shitou2, Miao Shunde3, Yang Junxia2, Xu Zhiyao4, Li Wenshuai1   

  1. 1. School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong, China;
    2. Changqing Oilfield Company, PetroChina, Xi'an 710021, China;
    3. CNOOC Research Institute, Beijing 100027, China;
    4. Niumag Electronics & Technology Co., Ltd, Suzhou 215163, Jiangsu, China
  • Received:2015-02-13 Published:2015-11-26

Abstract:

The comprehensive methods, including core observation, thin-section examination, physical property analysis, mercury porosimetry, and oil test, have been used to systematically study the characteristics of the low permeability reservoirs of Chang 63 Member in Huaqing area, analyze its origin, and discuss the main controlling factors of high quality reservoirs. The results show that the thick massive sandstones of the reservoirs of Chang 63 Member in Huaqing area are mainly composed of vertically stacked sandstones that are formed by liquefied sandy clastic flow. The rocks mainly consist of arkose with minor lithic arkose. The reservoirs are characterized by the low to particularly low porosity and permeability. The pores of the reservoir are primarily intergranular pores, secondary erosion pores, and intercrystalline micropores, the so called micro-fine throat structures. The formation of low permeability reservoirs of Chang 63 Member in Huaqing area is mainly controlled by the high matrix content, low textural, and low compositional maturation; and it is further strengthened by compaction. Under a suitable water dynamics with low mud content, a thick sandstones could develop into a high quality reservoir.

Key words: low permeability origin, high quality reservoirs, main controlling factors, Huaqing area

CLC Number: 

  • TE122.113

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