Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (4): 20-29.doi: 10.3969/j.issn.1673-8926.2017.04.003

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Hydrocarbon accumulation rules of Neogene in Xinchun area,Junggar Basin

YANG Yuanliang1, ZHU Xiaomin2, MA Ruiguo1, DONG Yanlei2, HOU Shuaijun1, JIANG Qiang2, LIU Chengquan3   

  1. 1. Xinchun Oil Development Co., Ltd., Sinopec, Dongying 257000, Shandong, China;
    2. College of Geosciences, China University of Petroleum, Beijing 102249, China;
    3. Geophysical Exploration Research Institute, PetroChina Jilin Oilfield Company, Songyuan 138000, Jilin, China
  • Received:2016-05-12 Revised:2016-07-10 Online:2017-07-21 Published:2017-07-21

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Abstract: The hydrocarbon accumulation conditions and rules of Neogene Shawan Formation(N1s)in Xinchun area are unclear,resulting in the failure of several exploratory wells. The regional structure,oil-source correlation,migration system and reservoir accumulation characteristics were analyzed. The results show that the favorable reservoir accumulation conditions include structural evolution, source rock, reservoir, seal and trap. Hydrocarbon generated from Jurassic in Sikeshu Sag,migrated northward and enriched in the first member(N1s1)and second member(N1 s1)of Shawan Formation. The sand group I of N1 s1 developed thick sands with large single layer thickness,which plays an important role in hydrocarbon migration and accumulation. N1 s2 and sand group Ⅱ of N1 s1 mainly developed sand-shale interbed. Under the vertical communication of small Himalayan faults,the thin sandstone of N1 s2 is finally accumulated. It is believed that two sets of thick layers of sandstone supply the lateral pathway for the hydrocarbon migration and enrichment,the coupling relationship of unconformity with pinchout sandstones controls the hydrocarbon enrichment of the sand group I of N1s1,and the coupling relationship of sandstones with small Himalayan faults developed controls the hydrocarbon accumulation of N1 s2 and sand group Ⅱ of N1s1.

Key words: low permeability reservoirs, reasonable production pressure difference, threshold pressure gradient, pressure-sensitive effect

CLC Number: 

  • TE122.3
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