Characteristics of tight sandstone reservoir of Chang 4+5 oil reservoir setin Yan’an area, Ordos Basin
Online published: 2013-11-26
According to the data of rock thin section, cast thin section, scanning electron microscope, X diffraction of clay minerals, high pressure mercury and properties analysis, this paper studied the characteristics of tight sandstone reservoir of Chang 4+5 oil reservoir set in Yan’an area. The results show that the rock type of Chang 4+5 sandstone reservoir is mainly fine-grained feldspar sandstone; porosity and permeability range from 6.0% to 10.0% and 0.2 mD to 2.0 mD respectively, and the reservoir belongs to typical tight sandstone reservoir; reservoir space is mainly residual intergranular pores, followed by dissolved pores in feldspar and laumontite; pore structure is dominated by small pore and fine throat type, followed by fine throat and pore tiny throat type; compaction and cementation in chlorite, calcite and laumontite are the main factor for causing poor reservoir properties, and dissolution improves reservoir properties. The results of this study provide a geological basis for rolling exploration and development for Chang 4+5 oil reservoir set in Yan’an area.
Key words: tight sandstone; reservoir characteristics; natural gas; Permian; Ordos Basin
WANG Weili , GAO Hairen . Characteristics of tight sandstone reservoir of Chang 4+5 oil reservoir setin Yan’an area, Ordos Basin[J]. Lithologic Reservoirs, 2013 , 25(6) : 25 -29 . DOI: 10.3969/j.issn.1673-8926.2013.06.005
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