石油学报 ›› 2010, Vol. 31 ›› Issue (1): 55-60.DOI: 10.7623/syxb201001009

• 地质勘探 • 上一篇    下一篇

塔北隆起西部复式油气区原油成因与成藏意义

张 斌 1,2 崔 洁 3 顾乔元 4 朱光有 2 苏 劲 2   

  1. 1 中国地质大学 北京 100083; 2中国石油勘探开发研究院提高石油采收率国家重点实验室 北京 100083; 3大庆石油学院 黑龙江大庆 163318; 4中国石油塔里木油田公司 新疆库尔勒 841000
  • 收稿日期:2009-04-10 修回日期:2009-08-20 出版日期:2010-01-25 发布日期:2010-05-21
  • 通讯作者: 张 斌

Oil origin classification in composite hydrocarbon accumulation play in the western Tabei Uplift and its geological significance

ZHANG Bin 1,2 CUI Jie 3 GU Qiaoyuan 4 ZHU Guangyou 2 SU Jin 2   

  • Received:2009-04-10 Revised:2009-08-20 Online:2010-01-25 Published:2010-05-21
  • Contact: ZHANG Bin

摘要:

塔北隆起西部地质构造复杂,含油气层系多,是一个典型的“复式油气聚集区”。在该区原油物理性质、地球化学特征以及碳同位素综合分析基础上,将该地区原油划分为海相原油和陆相原油,其中陆相原油又包含湖相原油和煤系原油两种类型。与陆相原油相比,海相原油密度大,重排系列含量低,二苯并噻吩含量高,碳同位素轻。海相原油主要来自于中上奥陶统烃源岩,分布于奥陶系内幕岩溶储层中,与哈拉哈塘周缘的原油相近。湖相原油主要分布在白垩系卡普沙良群之下的风化壳中,而煤系原油主要分布于新近系—白垩系巴什基奇克组砂岩中。油源精细对比为油气来源、充注期次、运移方向的判识奠定了基础,是复式油气成藏研究的重要环节,同时还可有效地识别油气输导体系,为油气分布规律和控制因素分析提供直接证据。

关键词: 塔北隆起, 复式油气藏, 油气成因, 油源对比, 油气输导体系

Abstract:

The western Tabei Uplift with the complex geological structure and a series of oil and gas layers,is a typical “composite hydrocarbon accumulation play ”. On basis of the physical properties, geochemical behavior and carbon isotope date,crude oils in this region were classified into marine oil and terrestrial oil,and the terrestrial oil includes lacustrine oil and coal measure oil.Compared to terrestrial oil, the marine oil has high-density and high-content dibenzothiophene, low-content rearranged terpane and sterane series and low-value of carbon isotope. The marine oil was mainly derived from the Middle-Upper Ordovician source rocks and distributed in the Ordovician deep karst reservoir and similar to crude oil of the western Lungu and Tahe areas. The lacustrine oil mainly distributed in the weathering crust underlying K1kp Formation, and coal measure oil was mainly located in the sandstones of N-K1bs.Fine oil-source correlation is significant for hydrocarbon accumulation,and it can provide evidence for identifying oil and gas sources, hydrocarbon charging times and migration direction. This method can also effectively identify the hydrocarbon transmission systems and provide a direct evidence for oil-gas distribution and controlling factor analysis.

Key words: Tabei Uplift, composite oil-gas reservoir, hydrocarbon origin, oil-source correlation, hydrocarbon transmission system