天然气地球科学 ›› 2020, Vol. 31 ›› Issue (7): 962–969.doi: 10.11764/j.issn.1672-1926.2020.03.012

• 天然气地质学 • 上一篇    下一篇

准噶尔盆地阜康凹陷东斜坡侏罗系头屯河组油气成藏期次

刘超威(),郭旭光,王泽胜,朱伶俐,张蓉,陈洪   

  1. 中国石油新疆油田公司勘探开发研究院,新疆 克拉玛依 834000
  • 收稿日期:2019-12-09 修回日期:2020-03-21 出版日期:2020-07-10 发布日期:2020-07-02
  • 作者简介:刘超威(1990-),男,河南泌阳人,工程师,硕士,主要从事油气地质综合研究.E-mail:fclcw@petrochina.com.cn.
  • 基金资助:
    国家科技重大专项“准噶尔盆地岩性地层油气藏富集规律与目标评价”(2017ZX05001-004);中国石油天然气股份有限公司重大科技专项“准噶尔盆地油藏富集规律及勘探技术研究与应用”(2017E-04-01)

Study on hydrocarbon accumulation stage of Jurassic Toutunhe Formation in Fudong Slope, Junggar Basin

Chao-wei LIU(),Xu-guang GUO,Ze-sheng WANG,Ling-li ZHU,Rong ZHANG,Hong CHEN   

  1. Research Institute of Petroleum Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000,China
  • Received:2019-12-09 Revised:2020-03-21 Online:2020-07-10 Published:2020-07-02
  • Supported by:
    China National Science and Technology Major Project(2017ZX05001-004);Science and Technology Major Project of PetroChina(2017E-04-01)

摘要:

准噶尔盆地阜东斜坡侏罗系头屯河组油气同产。在前人研究的基础上,利用原油碳同位素、姥植比以及生物标志物资料,对阜东斜坡侏罗系头屯河组原油成因进行分析;并结合储层流体包裹体特征,探讨了其油气成藏期次。研究表明:阜东斜坡侏罗系头屯河组原油碳同位素值介于 -27.59‰~-29.97‰之间,姥植比较大,呈现出混源的特征;原油饱和烃色谱完整但质谱图上可见完整的25?降藿烷系列,说明阜东斜坡侏罗系头屯河组原油至少存在2期油气充注。储层中存在2期油气包裹体:一期赋存于石英颗粒微裂隙中,发黄绿色和黄色荧光;另一期赋存于切穿石英颗粒的微裂隙中,发蓝色荧光;结合埋藏—地热史分析认为,阜东斜坡侏罗系头屯河组存在2期油气充注,第一期油气来自二叠系腐泥型源岩,并在晚白垩世遭到破坏,第二期油气为侏罗系腐殖型源岩和二叠系腐泥型源岩产物的混合。研究区侏罗系头屯河组为充注—局部破坏—二次充注的成藏过程。

关键词: 阜东斜坡, 侏罗系头屯河组, 原油碳同位素, 25?降藿烷, 油气包裹体, 成藏期次

Abstract:

Based on previous studies, the carbon isotope, Pr/Ph ratio and biomarker characteristics are used to investigate the genesis of the Jurassic Toutunhe Formation in the Fudong Slope of Junggar Basin, and in combination with the characteristics of reservoir fluid inclusions, the hydrocarbon accumulation period is discussed. The results show that the carbon isotope of crude oil ranges from -27.59‰ to -29.97‰ with high Pr/Ph ratio, showing the character of mixed. The saturated hydrocarbon chromatography of the crude oil is complete but 25-norhopane can be detected which indicates that there are at least two periods of hydrocarbon charging. The hydrocarbon inclusions are located in micro-fractures within quartz grains with yellow fluorescence and micro-fractures through quartz grains with blue fluorescence. There are two uncontinuous major hydrocarbon accumulation stages. Oil and gas of the first stage is from Permian sapropelic source rocks and was destroyed in the Late Cretaceous. The second stage of oil and gas is a mixture of products from Jurassic humic source rocks and Permian sapropelic source rocks. The oil and gas accumulation process in the study area is characterized by “charging-damage-recharging”.

Key words: Fudong Slop, Jurassic Toutunhe Formation, Carbon isotope of crude oil, 25-norbornane, Hydrocarbon inclusion, Accumulation stage

中图分类号: 

  • TE132.2

图1

研究区位置及阜东斜坡侏罗系综合柱状图"

表1

阜东斜坡侏罗系头屯河组油井试油及原油物性数据"

井号日产量原油物性

气油比

/(m3/t)

油/t气/(104 m3密度/(g/cm3)黏度/(mPa·s)含蜡量/%凝固点/℃
Fd85.540.911 5

147.68

2.71-4

F296.150.884 922.335.9810
Fd90.80.860 29.798.8417
B274.820.0220.856 16.832.9645
Fd73.60.852 06.46.9210
Fd0529.540.050.887 323.828.131852
Fd510.250.0660.837 86.63.31064
Fd528.560.4330.835 26.839.480152
F00920.640.2310.847 56.444.59-12112
F32101.40.9670.841 85.828.42095
Fd26.670.0240.818 23.852.87836
F2831.230.8690.801 72.148.610278

图2

原油碳同位素与姥植比交会图"

图3

原油族组成碳同位素曲线"

图4

Fd5井侏罗系头屯河组原油饱和烃色谱及萜烷化合物特征"

图5

阜东斜坡侏罗系头屯河组流体包裹体偏光—荧光照片"

图6

阜东斜坡侏罗系烃类包裹体均一温度分布"

图7

Fd5井埋藏史和地温史"

图8

阜东斜坡侏罗系头屯河组成藏模式"

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