Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (6): 76-81.doi: 10.3969/j.issn.1673-8926.2012.06.014

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Reservoir characteristics of lower Kepingtage Formation in Tabei area

ZHANG Shaohua1， PU Renhai1， YUN Lu2， SUN Naiquan1   

  1. 1. State Key Laboratory of Continental Dynamics， Northwest University， Xi’an 710069， China； 2. Research Institute of Exploration and Development， Northwest Oilfield Company， Sinopec， Urumqi 830011， China
  • Online:2012-12-20 Published:2012-12-20

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Abstract:

Tight sandstone industrial reservoir of lower Kepingtage Formation was firstly found in shun 9 well in Shuntuogu ole area, the pore types and reasons of dense become an important aspect to study the new reservoir type. Based on drilling sections, cores, cast thin sections and scanning electronic microscope, the reservoir characteristics of lower Kepingtage Formation were studied. The result shows that the reservoir of lower Kepingtage Formation was formed in tidal flat and tidal delta. The reservoir rock is composed of fine-grained lithic sandstone, and the texture maturity is medium-high. The reservoir properties are poor, with lowporosity and ultra-lowpermeability. The pore types are mainly residual intergranular pores, followed by grain boundary and intragranular dissolved pores, which are mainly formed by
the two times dissolution of siliceous minerals. The poor porosity is mainly due to the influences of cementation and strong compaction. The properties in Tuoputai area is better than that in Shuntuoguole area on the plane, which is possibly caused by the absence of crude bituminization and kaolinite transformation by hydrothermal fluid in Permian.

Key words: igneous rocks, Stoneley wave, qualitative indicator of fluid mobility, permeability

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