Forming Conditions of Effective Reservoir of Nantun Formation in Wunan Sub-Sag of Hailaer Basin

Abstract

Abstract: The results from laboratory study and comprehensive analysis show that the effective reservoir of Nantun formation in Wunan sub-sag of Hailaer basin is dominated by normal terrigenous clastic reservoir with some tuff sedimentary rocks. The developed sections and secondary porosity developed sections in this reservoir are of good corresponding relations. The development of secondary porosity is affected by many factors, for example, the weathering leaching on unconformity and organic acid dissolution are main control factors for the secondary porosity; the particle propping effect of high structural maturity is major control factors for the primary porosity; weak compaction and authigenic clay mineral shell are also favorable effects on the formation of effective reservoir, and the sedimentary facies of delta front controls the distribution of the Nantun effective reservoir.

Key words: Hailaer basin, Wunan sub-sag, Nantun formation, effective reservoir, controlling factor, deep secondary porosity

CLC Number:

TE112.221

BAO Yuan, LUO Qun, WEI Chong-tao, WANG Chao-yong, ZOU Ming-jun. Forming Conditions of Effective Reservoir of Nantun Formation in Wunan Sub-Sag of Hailaer Basin[J]. Xinjiang Petroleum Geology, 2011, 32(5): 461-463.

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