Sedimentary] Facies of Y oushashan Oilfield in Qaidam Basin

Abstract

Abstract: The west part of Qaidam basin underwent the lacustrine transgression during E₁₊₂-N¹₁, followed by entering the regression in N²₁, with large-scale uplfting of Kunlun mountains situated in the southwestern margin of Qaidam basin. Hence the depocenter of lacustrine basin commenced moving from southwest to northeast. Under such a background, Youshashan area was subjected to the deposits of braided stream delta-saucer lake in N₁-N¹₂. The XII-I oil measures in Y oushashan oilfield normally assume anticycle deposits shoaling upward. Below VII oil measure (N₁) is dominated by braided stream delta front-shore saucer lake deposits; over this oil measure (N¹₂) by braided stream delta plain-front deposits. Laterally, II-V blocks are contolled by the structures in reservoir distribution, with stable sedimentation, while I and VI blocks are mostly influenced by lithogical factors.

Key words: Qaidam basin, Youshashan oilfield, sedimentary facies

CLC Number:

TE111.3

WANG Lin, JIA Ying-lan, JIANG Yi-quan, HUANG Zhen-lian, JIA NG Ming-zhong. Sedimentary] Facies of Y oushashan Oilfield in Qaidam Basin[J]. Xinjiang Petroleum Geology, 2005, 26(4): 373-376.

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Sedimentary] Facies of Y oushashan Oilfield in Qaidam Basin

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