LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (5): 176-182.doi: 10.3969/j.issn.1673-8926.2015.05.029

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Clastic reservoir characteristics and oil-bearing properties within middle and small-sized basins in the central and western regions of China

Huang Junping12, Yang Zhanlong12, Liu Hongjun3, Di Jun1, Huang Yunfeng12, Han Xiaofeng4   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest , Lanzhou 730020 , China ; 2. Key Laboratory of Reservoir Description , CNPC , Lanzhou 730020 , China ; 3. School of Earth Science and Engineering , Xi ’ an Shiyou University ,Xi ’ an 710065 , China ; 4. Xi ’ an Center of Geological Survey , China Geological Survey , Xi ’ an 710054 , China
  • Online:2015-09-26 Published:2015-09-26

Abstract:

The oil and gas shows are enriched in middle and small-sized basins in the central and western regions of China, but only few proven reserves were found with low exploration degree. Based on core observation, field outcrop data and experimental analysis, the clastic reservoir characteristics and the controlling factors of oil-bearing properties were analyzed. The results show that: (1) there are developed five sets of clastic reservoirs in the middle and smallsized basins, which are respectively in the Carboniferous-Permian and Triassic strata in transitional facies depositional environment, in the Jurassic coal-bearing strata and Cretaceous non-coal-bearing strata in continental depositional environment, and in the Tertiary strata in alluvial fan depositional environment; (2) the sandstone reservoirs are well developed, but they have poor properties with low porosity, low permeability and low hydrocarbon saturation; (3) the mineral compositions of sandstone reservoir are mainly quartz, feldspar, clay minerals, calcite and dolomite, and different tectonic setting and depositional environment affected mineral compositions of the reservoir; (4) the reservoir space types are rich, including intraparticle pores, interparticle pores, microcracks and organic-matter pores; (5) the oil-bearing properties of sandstone reservoirs are mainly affected by sedimentary facies, rock and mineral compositions, reservoir properties and reservoir space types and other factors.

Key words:  sandstone ( conglomerate ), rare earth elements, provenance , Creaceous , Yaerxia area , Jiuxi Basin

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