Spatial distribution and characterization of pore and throat of oolitic dolostone of the Lower Triassic Feixianguan Formation in northeastern Sichuan Province
Zhang Tianfu1,2, Shou Jianfeng1,2, Zheng Xingping1,2, She Min1,2, Pan Liyin1,2
1 PetroChina Hangzhou Research Institute of Geology，Hangzhou 310023，Zhejiang 2 Key Laboratory of Carbonate Reservoir，CNPC，Hangzhou 310023，Zhejiang
Abstract：The research of pore and throat texture is a key issue for oil exploration and development.With micro-CT and numerical rock technology，the authors characterized the texture of pore and throat of residual oolitic dolostone of the Lower Triassic Feixianguan Formation in northeastern Sichuan Province，and established the 3D models in micro scale.Based on these models，its radius，shape factor and spatial connectivity were calculated.A further discussion on the modelshas been processed under the help of SEM and mercury injection.The result indicates that pore system of the residual oolitic dolostone include interparticle pore，interparticle dissolved pore（moldic pore），intercrystalline（dissolved）pore，intercrystalline aperture，microfracture etc.The intercrystalline pore and microfracture are the connectivity pathway as throat.Its minimal size could be reduce to 20～30 nm.Recrystallization of the experimental sample is heavy，so the throat would be blocked due to the growth of the crystal and tectonic compaction after later diagenesis.
Zhang Tianfu,Shou Jianfeng,Zheng Xingping et al. Spatial distribution and characterization of pore and throat of oolitic dolostone of the Lower Triassic Feixianguan Formation in northeastern Sichuan Province[J]. JOPC, 2012, 14(2): 187-196.
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