Characteristics and Genesis of Low Resistivity Gas Reservoir of Cretaceous-Tertiary in Southern Tianshan Area
Received date: 2010-01-27
Revised date: 2010-04-06
Online published: 2011-02-10
The Cretaceous-Tertiary clastic gas reservoir with rich gas condensate in southern Tianshan area of the Tarim basin displays low\|resistivity property. The value of gas resistance of Suweiyi Formation，Kumugeliemu Group of the lower Tertiary and Bashijike Formation of the lower Cretaceous, ranges from 1 to 3 Ω·m, and that of Yageliemu Formation of the lower Cretaceous varies from 4 to 9 Ω·m. The electrical property of gas reservior has the following features: ①Similar to or a little higher than that of water layer; ②Lower than that of surrounding rock ;③Generally higher than that of fomation zone, with the characteristic of RFOC＞RILM＞RILD in the three-resistivity\|curve. According to the analysis of drilling, logging and well test data, it is found that the lithofacies, lithology and fluid characteristics of reservoir provides favorable geology condition, while high irreducible water saturation and high formation water salinity is the main reason for the formation of the low resistivity gas reservoir, but high formation temperature may reduces the resistivity.
Key words： Low-resistivity; Genesis analysis; Cretaceous; Tertiary; Southern Tianshan area; Tarimbasin.
YU Qi-Xiang, LU Qing-Hua, ZHU Yong-Hui . Characteristics and Genesis of Low Resistivity Gas Reservoir of Cretaceous-Tertiary in Southern Tianshan Area[J]. Natural Gas Geoscience, 2011 , 22(1) : 108 -114 . DOI: 10.11764/j.issn.1672-1926.2011.01.108
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