新疆石油地质 ›› 2011, Vol. 32 ›› Issue (5): 476-479.

• 油气勘探 • 上一篇    下一篇

钻井高分辨率层序地层划分及其古生态响应——以柴达木盆地乌南地区下油砂山组为例

杨平a, 张道伟a, 袁秀军a, 张英a, 吴明生a, 颜学刚b, 张海阳b   

  1. 中国石油青海油田分公司a.勘探开发研究院,甘肃敦煌 736202; b.冷湖油田管理处,青海冷湖 816000
  • 收稿日期:2010-12-24 出版日期:2011-10-01 发布日期:2020-08-19
  • 作者简介:杨平(1968-),男,青海平安人,高级工程师,古生物与层序地层,(Tel)0937-8923337(E-mail)yp861@163.com.
  • 基金资助:
    中石油“柴达木盆地勘探开发关键技术研究”项目(07–01Z–01–02)

High-Resolution Sequence Stratigraphy Division and Its Paleoecology Response from Drilling Records—An example from Xiayoushashan formation in Wunan area of Qaidam basin

YANG Pinga, ZHANG Dao-weia, YUAN Xiu-juna, ZHANG Yinga, WU Ming-shenga, YAN Xue-gangb, ZHANG Hai-yangb   

  1. Qinghai Oilfield Company, PetroChina, a. Research Institute of Exploration and Development, b. Lenghu Oilfield Management Department, Lenghu, Qinghai 816000, China
  • Received:2010-12-24 Online:2011-10-01 Published:2020-08-19

摘要: 在年代地层框架内,以高分辨率层序基准面旋回识别层序界面,将柴达木盆地乌南地区南参2 井下油砂山组划分为两个中期基准面旋回(三级层序)。由于沉积环境演化与层序基准面旋回是相互影响的,所以沉积相和反映沉积环境的古生态特征是基准面旋回的重要划分依据。钻井沉积相划分以西岔沟露头下油砂山组河流–湖泊相砂、泥岩沉积序列为参照,划分古生态有浅水、较深水、淡水、较咸水等类型。以上述方法划分单井层序后,建立了乌南地区下油砂山组等时层序地层格架,并分析了层序格架内基准面旋回与古生态特征的响应关系。

关键词: 柴达木盆地, 下油砂山组, 基准面旋回, 沉积环境, 古生态, 层序地层格架

Abstract: In the chronostratigraphy framework, utilizing the high resolution sequences base-level cycle to identify sequences boundaries, the Xiayoushashan formation of Nancan-2 well in Wunan area of Qaidam basin can be divided into two medium base-level cycles (Class-3 sequence). The changes in sedimentary environment and base-level cycles is interactional, so the sedimentary facies and paleoecology characters are significant evidences on the cycle division. The well sedimentary facies can be divided by references to sedimentary characters of fluvial and lacustrine sands and mudstone at Xiayoushashan formation of Xichagou outcrop, the paleoecology types include shallow water, deep water, fresh water and brackish water. Therefore, the isochronous stratigraphic framework of Wunan area is established, the relations between base-level cycles and paleontology responses are then analyzed.

Key words: Qaidam basin, Xiayoushashan formation, base-level cycle, sedimentary environment, paleoecology, sequence stratigraphic framework

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