塔中台盆区原油正构烷烃摩尔浓度分布特征及意义.pdf

矿物岩石地球化学通报
?研究成果
Bulletin of MineralogyPetrology and (geochemistry
Vol. 30 No. 1, Jan. 2011
塔中台盆区原油正构烷烃摩尔浓度
分布特征及意义
李碧,黄光辉',徐阳东2,唐小强',韩金平
教育部油气资源与勘探技术重点实验室,长江大学地球化学系,湖北荆州434023;
2.长江大学地球科学学院,湖北荆州434023
摘要:塔里木盆地塔中地区原油佐质的多样性和复杂性十分罕见;分析表明,成熟作用和源岩相很可能是源油多样性的次
要因素,主要影喃因素可能与多親成藏或成藏后储层内的次生蚀变作用有关。本文对照正构烷烃摩尔浓度分布图版,辨别了
塔中地区不同构造单元原油正构淀烃摩尔浓度的分布类型、分析了原油遭受次生蚀变作用的程度,以及蒸发分作用、气洗
作用发生的原因及其对原油物性的影响。结杲表明,由于运移通道以及与油气源的距离鎣因素,从塔中工号断裂坡折带至中
夹新垒带,蒸发分馏作用和气洗作用发生的频率逐渐啐低,但苤恋原油分冇频率有增高的趋势。并且1号斷裂放浙带部分凝
析油、高蜡油的形成主要与上述落发分馏、气洗、晶析等储层内次生变作用有关。
关键词:塔中地区;正构炕烃摩尔浓度;蒸发分馏作用;气洗作用;高蜡原油
中图分类号:P618.13文献标识码:A文章编号:1007-2802(2011)01-0097-0
The Distribution Characteristics of n-alkanes Mole Concentration in the Crude
oils of the Central Tarim Basin Platform and its Geochemistry Applications
LI Bil, HUANG Guang-hui,XU Yang-dong,
TANG Xiao- qiang, HAN Jin-ping
Ministryo/ Education Key Laboratory of Exploration Technology for il and Gas Resources,Jinghou 434023, China
(eoscience School of Yangtze University, Jingzhou 434023, China
Abstract: The diversity and the complexity of the oils from the Tazhong area, Tarim Basin, are very rare. The ana
lytical result shows that the maturation and the source rock phase are likely the secondary factors, while the main
actor may be multi-stage deposit or secondary alteration in the reservoir. According to the board of the n-alkanes
mole concentrations of the crude oil, this paper studied the distributions of n-alkanes'mole concentrations in crude
oils from the diffe ent tectonic units in thc Tazhong area, analyzed the degree of secondary alteration of the crude
oil, and investigated the causes of evaporation fractionation and gas washing and their impacts to the chemical prop
erties of the crude oils. The results indicated that, because of the factors of different migration channels and migra-
tion distance from the oil and gas sources, the frequencies of undergoing evaporative fractionation and gas washing
decreasc gradually but the frequency of finding crude oils increases from the No. I fault zone to the central uplift
zone of the Tazhong area. The results also suggested that the forming of condensed oils and high wax oils in the
No I fault zone can be mainly associated with evaporative fractionation, gas washing and crystal fractionation
Key words: Central Tarim Basin; n-alkanes: mole concentration; evaporation fractionation and gas washing; high
wax content o!
收稿日期:2010-01-09收到,2010-07-02改
基金项目:国家白然科学基金资助项目(40973041
第一作者简介:李碧(1982),女,在读硕士研究生,油气地球化学专业