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中南大学学报(自然科学版)

Journal of Central South University

第45卷    第9期    总第241期    2014年9月

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文章编号:1672-7207(2014)09-3127-10
鄂尔多斯盆地安塞地区长9致密油成藏机理与主控因素
白玉彬1,赵子龙1,赵靖舟1,刘鹏2,李树垚1

(1. 西安石油大学 地球科学与工程学院,陕西 西安,710065;
2. 中国石油集团 测井有限公司技术中心,陕西 西安,710018
)

摘 要: 基于鄂尔多斯盆地安塞地区三叠系延长组长9致密油为近年来新发现的含油层位,认为其不具备形成大面积分布的准连续型致密砂岩油藏的形成条件,为此,以陕北斜坡中东部安塞地区长9油藏为例,探讨这种非准连续型致密砂岩油藏的形成机理与主控因素。研究结果表明:安塞地区长9油藏烃源岩质量较好、大面积分布但厚度较小,储层广泛分布,与烃源岩互层接触但非常致密,综合认为其成藏条件为较好—中等;早白垩世(120~100 Ma)时,长9暗色泥岩达到成熟阶段,油气生成并充注到长9致密砂岩储层中,近源运移并形成非常规油气聚集;长9油藏分布主要受控于烃源岩、储层和鼻状隆起背景控制,其中有效烃源岩分布范围控制油藏分布范围,储层展布及非均质性控制油气富集地区及含油层段,鼻状隆起背景对油气的富集高产具有重要的控制作用。

 

关键词: 鄂尔多斯盆地;安塞地区;长9油层组;致密油;成藏机理;主控因素

Oil reservoir forming mechanisms and main controlling factors of tight oil of Chang-9 member in Ansai area, Ordos Basin
BAI Yubin1, ZHAO Zilong1, ZHAO Jingzhou1, LIU Peng2, LI Shuyao1

1. School of Earth Sciences and Engineering, Xi’an Petroleum University, Xi’an 710065, China;
2. Technology Center of CNPC Logging, Xi’an 710018, China

Abstract:The Chang-9 member tight oil of Yanchang Formation of Triassic in Ordos Basin in Ansai area was discovered in recent years, and initial studies suggested that it does not possess the forming conditions to form a large area of distribution of the quasi-continuous tight sandstone reservoir. Taking the Chang-9 reservoir as an example of Ansai area in mid-eastern Shanbei slope, the non quasi-continuous tight sandstone reservoir forming mechanism and main controlling factors were discussed. The results show that Chang-9 reservoir source rock quality is good, and it has big area distribution but thinner thickness, widespread distribution reservoir and hydrocarbon source rocks interbedded touch but very compact, the integrated accumulation conditions are good—medium. In the early Cretaceous (120-100 Ma), the Chang-9 dark mudstone reaches the stage of maturity, and then a large scale of oil and gas generated and injected into the Chang-9 tight sandstone reservoir, finally migrates to nearby reservoir at a short distance and forms an unconventional oil & gas accumulation. The distribution of the Chang-9 oil reservoir is mainly controlled by its source rock, reservoir and the background of nose-shaped uplift. A distribution range of the effective hydrocarbon source rock controls the reservoir distribution, reservoir spreading and the heterogeneity control the enrichment area of oil and gas and the oil bearing intervals, and the background of nose-shaped uplift plays an important role in the control of the oil & gas accumulation and production.

 

Key words: Ordos Basin; Ansai area; Chang-9 member; tight oil; accumulation mechanism; main controlling factors

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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