Dongping Gas Field is a newly discovered rare massive,buried-hill and bedrock gas reservoir in the Qaidam Basin.As one of the three fault blocks of Dongping Gas Field,Pingxi area is one of the main potential areas of Dongping bedrock gas reservoir.Based on core,thin-section identification,X-ray diffraction analysis,laser confocal scanning,and CT scanning as well as test data,we identified the lithology characteristics and reservoir space types of Pingxi bedrock gas reservoir.Combined with gas production test,structure interpretation and fracture prediction,the gas accumulation characteristic and major controlling factors of Pingxi basement gas reservoir are revealed.The study indicates that the lithology is mainly composed of metamorphic limestone,slate and melange,reservoir space is mainly structural fracture,dissolution fracture and corrosion pore in basement gas reservoir in Pingxi area.Metamorphic limestone and slate are the most favorable reservoir because of their high angle fractures and bedding fractures.Pingxi bedrock gas reservoir is a structure-fracture gas reservoir with fracture and matrix pore of complex metamorphic rock.Structure and fracture are the main controlling factors of reservoir formation.The structure controls gas distribution and the fracture associated with gas source faults controls hydrocarbon enrichment.The research results provide geological theory basis and technical support for the exploration and development of Pingxi bedrock gas reservoir and practical guiding significance.
Li Yan-li, Gou Ying-chun, Ma Xin-ming, Li Cheng-cheng, Wang Pu, Chen Fang-fang
. Reservoir characteristics of bedrock gas reservoir in Pingxi area,Qaidam Basin[J]. Natural Gas Geoscience, 2019
, 30(2)
: 219
-227
.
DOI: 10.11764/j.issn.1672-1926.2018.12.006
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