Pore Structure and Heterogeneity of Marine Shales in the Middle-Upper Yangtze
Received date: 2015-04-30
Revised date: 2015-05-22
Online published: 2015-08-10
The composition and structure of shale gas reservoirs show remarkable heterogeneity from macro-scale to nano-scale.By comprehensively analyzing various experimental data,the pore structure,micro-heterogeneity and the affecting factors,along with pore evolvement rule of both the Qiongzhusi Formation and Longmaxi Formation in the Middle-Upper Yangtze were characterized.Both formations are organic enriched with shale thickness more than 100m and 50m,respectively.However,the porosity,pore volume,specific surface area and other parameters of the shales differ prominently and the Longmaxi Formation represents a better pore structure parameter.The micropore and transitional pore are the dominant pore type in the Longmaxi Formation,which is unlike the Qiongzhusi Formation,whose pore volume of samples is quite centralized in certain interval with poor connectivity.The variation coefficient of pore structure and the NMR relaxation time (T2) indicate that the Qiongzhusi shale is of higher heterogeneity,and the micropore volume,which is the key space for gas occurrence,differs between samples in the Qiongzhusi shale and represents a weak connectivity.These two shales experienced similar external factors,such as multiphase tectonic stress field deformation,and formed tensional and shear fissure network,which increased the reserving volume,connectivity,and permeability.Composition and the diagenesis modification are the main internal factors and the nature of pore evolvement,and the pores and fissures are mainly influenced by the organic matter,quartz,and other compositions.TOC and quartz content represent a positive liner correlation with pore volume and specific surface area,while clay content is negative.High maturity is beneficial in forming effective pore network because the dissolution of organic acid.Compaction leads to the volume decrease of inter-and intrapartical pores,and the draining of interlayer water as well as mechanical deformation of clay impacts on the pore structure,too.
CHEN Shang-bin，QIN Yong，WANG Yang，ZHANG Han，ZUO Zhao-xi . Pore Structure and Heterogeneity of Marine Shales in the Middle-Upper Yangtze[J]. Natural Gas Geoscience, 2015 , 26(8) : 1455 -1463 . DOI: 10.11764/j.issn.1672-1926.2015.08.1455
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