Genesis of Low-resistivity Reservoirs in Qintong Sag, Subei Basin
Received date: 2009-10-14
Revised date: 2009-11-02
Online published: 2009-12-10
The resistivity of low-resistivity reservoirs is usually close to or sometimes lower than that of adjacent water\|bearing zones. It is verified by testing that low\|resistivity pay zones exist in the third member of the Funing Formation of the Qintong sag, but their mechanism and genesis are not clear. Based on such modern laboratory techniques as scanning electronic microscope and X-ray diffraction, the lithologic characteristics, the types, content and distribution of clay minerals, pore texture, the salinity of formation water of the reservoir are fully researched. The study shows that high bound water, the additional conductivity, and high salinity of formation water result in low-resistivity pay zones of the third member of the Funing Formation. Based on the geologic condition and conductive mechanism of the low-resistivity reservoir, logging interpretation and evaluation should be aimed at the type caused by high irreducible water saturation, and the “dual water model” should be used to evaluate it. For prediction of low\|resistivity reservoirs distribution, the weakly hydrodynamic sediment area is favorable for the main enrichment.
LIU Yu-Chun, LIU Wei-Xin, TAN Zhen-Hua, FU Jiang, LI Gao . Genesis of Low-resistivity Reservoirs in Qintong Sag, Subei Basin[J]. Natural Gas Geoscience, 2009 , 20(6) : 941 -944,1008 . DOI: 10.11764/j.issn.1672-1926.2009.06.941
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