Characteristics and Evaluation of Reservoir of Upper Es2 of Paleogene in Zhanhua Sag

Abstract

Abstract: Through systematical analysis of data of drilling, well-logging, thin-section and cast-section in 84 wells, the distribution and characteristics of the sandstone reservoir of upper Es₂ of Paleogene in Zhanhua sag are studied in detail. The reservoir is characterized by the micro-facies sands of both fan delta frontal sub-aqueous distributary channel and beach bar of littoral and shallow lake, with lithology of lithoclasitic quartz sandstone and lithic sandstone, and dominated by primary pores of 8%～24% and permeability of (1～100)×10^-3μm². According to the characteristics of porosity, permeability, pore configuration, pore combination and petrological structure, the reservoir is classified into three types of I, II and III. Type I is high-quality reservoir distributing in the southeastern Zhanhua sag; type II is medianquality one which lies in the eastern and northern Zhanhua sag, while type III is poor one in the northwestern Zhanhua sag, the west of Kendong swell and the south of Gudao swell.

Key words: Zhanhua sag, Paleogene, Shahejie formation, reservoir, characteristic, evaluation

CLC Number:

TE112.221

ZHANG Peng-fei, CHEN Shi-yue, ZHANG Ming-jun, YAN Ji-hua. Characteristics and Evaluation of Reservoir of Upper Es2 of Paleogene in Zhanhua Sag[J]. Xinjiang Petroleum Geology, 2007, 28(4): 468-470.

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