Research on the main factors of high quality tight sandstone reservoir in Linxing block，Ordos Basin
Received date: 2017-08-30
Revised date: 2018-02-06
Online published: 2018-04-10
It is the key point to find the sweet point in the process of exploration.Based on the experimental analyses on particle size，X-ray diffraction，casting thin sections and mercury injection，combined with imaging logging，we performed a series of research on tight sand petro-physical characteristics，and concluded the main controlling factors of high quality reservoirs in Linxing area，Ordos Basin.The reservoir pore throat size consists of fine-small pore throat，intergranular dissolved pore and dissolution particles are the main reservoir space，and porosity and permeability mainly concentrates in 4%-10% and (0.1-1)×10-3μm2，respectively，belonging to low porosity，low permeability reservoir.High quality reservoir surface is controlled by sedimentary micro-facies and micro-cracks，and is also influenced by diagenesis in the longitudinal direction.Dissolution is also one key factor to improve the reservoir property.As facies variation，corresponding physical property also changes.The sand flat of tidal flat，distributary channel of delta facies and edge beach of meandering river facies are of best quality.Good reservoir can be formed by the development of pore of the coarse-grained sandstone.The site micro-fractures derived from tectonic movement and Zijinshan magma intrusion and cooling may be the site where high quality reservoir develops.The secondary pores and dissolution development which are formed by the dissolution of feldspar in the diagenetic process are the basis for the development of the quality reservoir of tight sandstone.Part of mineral and rock composition have dual influence on reservoir property: diagenesis exacerbated the densification of the reservoir at the same time，and the amount of brittle mineral，authigenic clay minerals and carbonate rocks，pyroclastic construction play an important role in the formation of high quality reservoirs.
Liu Xi-jie，Ma Zun-jing，Han Dong，Wang Hai-yan，Ma Li-tao，Ge Dong-sheng . Research on the main factors of high quality tight sandstone reservoir in Linxing block，Ordos Basin[J]. Natural Gas Geoscience, 2018 , 29(4) : 481 -490 . DOI: 10.11764/j.issn.1672-1926.2018.02.002
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