准噶尔盆地南缘中部超深层凝析油成因与油源

宋永; 庞志超; 李静; 陈建平; 王绪龙; 孙永革; 倪云燕

doi:10.7623/syxb202503003

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准噶尔盆地南缘中部超深层凝析油成因与油源

地质勘探 | 更新时间：2025-12-03

- 准噶尔盆地南缘中部超深层凝析油成因与油源
- Genesis and source of ultra-deep condensate oil in the central part of southern margin of Junggar Basin
- 石油学报 2025年46卷第3期页码：510-531
- 作者机构：
  
  1. 中国石油勘探开发研究院,北京,100083
  2. 中国石油新疆油田公司,新疆,克拉玛依,834000
  3. 浙江大学地球科学学院,浙江,杭州,310027
  4. 中国石油大学(北京)地球科学学院,北京,102249
- 作者简介：
  
  [ "宋永,男,1978年9月生,2020年获西南石油大学博士学位,现为中国石油勘探开发研究院教授级高级工程师,主要从事盆地油气勘探开发研究与管理工作。Email:syong@petrochina.com.cn" ]
- 基金信息：
- DOI：10.7623/syxb202503003
  中图分类号： TE122.1
- 网络出版：2025-04-03，
  
  纸质出版：2025
- 稿件说明：
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宋永, 庞志超, 李静, 陈建平, 王绪龙, 孙永革, 倪云燕. 准噶尔盆地南缘中部超深层凝析油成因与油源[J]. 石油学报, 2025, 46(3): 510-531.

Song Yong, Pang Zhichao, Li Jing, et al. Genesis and source of ultra-deep condensate oil in the central part of southern margin of Junggar Basin[J]. ACTA PETROLEI SINICA, 2025, 46(3): 510-531.
宋永, 庞志超, 李静, 陈建平, 王绪龙, 孙永革, 倪云燕. 准噶尔盆地南缘中部超深层凝析油成因与油源[J]. 石油学报, 2025, 46(3): 510-531. DOI： 10.7623/syxb202503003.

Song Yong, Pang Zhichao, Li Jing, et al. Genesis and source of ultra-deep condensate oil in the central part of southern margin of Junggar Basin[J]. ACTA PETROLEI SINICA, 2025, 46(3): 510-531. DOI： 10.7623/syxb202503003.

摘要

准噶尔盆地南缘中部地区呼西背斜呼探1井和东湾背斜天湾1井在7 300~8 100 m深度段下白垩统—上侏罗统获得了高产油气流

超深层油气勘探获得重大突破

展现了准噶尔盆地南缘冲断带超深层下组合良好的油气勘探前景。这些油气藏的油气来源及成因成为认识超深层下组合油气成藏规律、控制因素和油气资源潜力的关键。基于呼西背斜和东湾背斜超深层凝析油物理化学和地球化学特征的精细分析

探讨了凝析油的来源与成因。研究结果表明

呼探1井和天湾1井的凝析油密度低、黏度小、含蜡量和凝固点低

低碳数烷烃、环烷烃和芳香烃含量较高

中—高碳数正构烷烃含量也较丰富

属于低密度、低蜡、低凝轻质油。这些凝析油具有轻的碳同位素组成

全油的δ

C为-30.7 ‰~-28.6 ‰

—nC

正构烷烃分子的碳同位素组成轻

尤其是nC

—nC

分子的碳同位素组成特别轻

相应的δ

C为-29 ‰~-33 ‰。类异戊二烯烷烃丰度较高

显示姥鲛烷(Pr)和植烷(Ph)含量均势或Ph含量占优势

Pr/Ph为0.69~1.27。生物标志物组成中

、C

规则甾烷和重排甾烷含量丰富

甲基甾烷含量较丰富

ααα-20R构型的C

、C

甾烷呈“V”型分布

甾烷的异构化成熟度参数20S/(20S＋20R)和ββ/(αα＋ββ)分别大于0.45和0.60

三环萜烷含量丰富且呈以C

三环萜烷最高的近正态分布

18α(H)-三降藿烷(Ts)、C

Ts、C

重排藿烷和C

重排藿烷含量非常丰富

伽马蜡烷含量高且明显含有异构体

指示凝析油由半咸水—咸水湖相富黏土矿物沉积环境下的有机质所生成。总体上

准噶尔盆地南缘中部地区超深层呼探1井和天湾1井凝析油的地球化学特征与该地区霍尔果斯背斜等中—浅层油气藏的原油/凝析油非常相似

油源为下白垩统清水河组湖相烃源岩

凝析油为前期油藏遭受后期天然气气侵/气洗改造作用而形成。

Abstract

In the central part of southern margin of Junggar Basin

Well Hutan1 at the Huxi anticline and Well Tianwan1 at the Dongwan anticline have obtained high-yield oil-gas flows from the Lower Cretaceous to Upper Jurassic reservoirs at a burial depth from 7 300 m to 8 100 m

which has made a major breakthrough in ultra-deep oil-gas exploration

showing a good prospect for hydrocarbon exploration in the ultra-deep lower assemblage of the thrust belt in the southern margin of Junggar Basin. The source and genesis of oil and gas in reservoirs are vital for understanding the hydrocarbon accumulation regularity and controlling factors as well as hydrocarbon resource potential in the ultra-deep lower assemblage. Based on the fine analysis and study of physicochemical and geochemical characteristics of ultra-deep condensate oil at the Huxi anticline and Dongwan anticline

the source and genesis of condensate oil was explored. The results show that the condensate oils in Well Hutan1 and Well Tianwan1 are characterized by low densities

low viscosities

low wax contents and freezing points

and high contents of alkanes

naphthenes and aromatics with low carbon numbers

as well as rich contents of n-alkanes with middle-high carbon numbers

and thus they are classified as light oils with low densities

low wax contents and low freezing points. The condensate oils have a light carbon isotope composition

the δ

C value of whole oil is from -30.7 ‰ to -28.6 ‰

and nC

-nC

n-alkanes have light carbon isotope compositions

especially nC

-nC

n-alkanes

and the corresponding δ

C value is from -29 ‰ to -33 ‰ . The condensate oils have a relatively high abundance of isoprenoids which show equalizing pristine (Pr)and phytane (Ph)contents or having a dominant Ph content

with Pr/Ph ratio from 0.69 to 1.27. In the compositions of biomarkers

and C

steranes and diasteranes are abundant

methylsteranes are

relatively abundant

and C

ααα-20R steranes show a V-shaped distribution. The 20S/(20S+20R)ratio and ββ/(αα＋ββ)ratio of C

sterane are greater than 0.45 and 0.60

respectively. The condensate oils have abundant tricyclic terpenes showed a near-normal distribution with C

terpane as the highest

have very abundant 18α(H)- trisnorneohopane (Ts)

diahopane and C

diahopane

and have a high content of gammacerane with an isomers

indicating that the condensate oil is generated by organic matters deposited in semi-saline to saline lacustrine clay-rich environment. As a whole

the condensate oils from Well Hutan1 and Well Titanwan1 in the ultra-deep reservoir of the central part of southern margin of Junggar Basin have very similar geochemical characteristics with the crude oil/condensate oil from the middle to shallow reservoirs at the Horgos anticline. The condensate oils are derived from the lacustrine source rocks of the Lower Cretaceous Qingshuihe Formation

and are formed by later gas invasion/washing in the early oil reservoirs.

关键词

Keywords

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