LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (1): 58-65.doi: 10.3969/j.issn.1673-8926.2015.01.009

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Reservoir characteristics and controlling factors in H block of Triassic Basin, North Africa

KUANG Kexin 1,2, ZHANG Shangfeng1,2, YU Shui3, WANG Ruoli4, HUANG Chun5   

  1.  1.Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University ,Wuhan 430100 , China ; 2. School of Geosciences , Yangtze University , Wuhan 430100 , China ; 3. CNOOC Research Institute , Beijing 100027 , China ; 4. PetroChina Changqing Oilfield Company , Qingyang 745000 , Gansu , China ;5. PetroChina Xinxiang Oilfield Company , Karamay 834000 , Xinjiang , China
  • Online:2015-02-03 Published:2015-02-03

Abstract:

 Triassic Basin is a large composite oil and gas-bearing basin in Algeria of north Africa,with excellent geologic conditions for hydrocarbon accumulation and multiple sets of source-reservoir-cap assemblages. There are two main reservoirs: Ordovician Hamra Formation and Triassic Tagi Formation sandstones in the study area, to study the reservoir characteristics and controlling factors is significant for both hydrocarbon exploration and well site deployment. Based on regional geological data, cores and thin section observation, this paper studied the sedimentary, petrological and physical properties and microscopic pore types of sandstone reservoir of Tagi Formation and Hamra Formation in H block of Triassic Basin. The result shows that Tagi Formation sandstone is mainly composed of quartz sandstone and lithic quartz sandstone of fluvial facies, with medium compositional and textural maturity, and the reservoir spaces are mainly intergranular pores and intergranular dissolved pores; while Hamra Formation mainly developed quartz sandstone and feldspar quartz sandstone of shore facies, with high textural and compositional maturity, and the reservoir spaces are mainly fractures with small amount of dissolved pores resulting from dissolution. These two Formations are considered to be extremely low porosity and extremely low permeability reservoir and low porosity, low permeability reservoir according to property data. Sedimentation is the main controlling factor for reservoir quality of Tagi Formation, while diagenesis has some rebuilding effect. The Hamra reservoir is mainly controlled by dissolution. The Tagi-2 member in the study area is predicted to be the favorable area for high quality reservoir with great exploration potential.

Key words:  gas reservoir, horizontal well, acidizing, coupling model, pressure drop in the wellbore, skin factor, production-increasing ratio


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