克拉苏构造带凝析油特征及其对油气成藏的指示意义

卓勤功，李勇，鲁雪松，王媛，邸晓文

doi:10.11764/j.issn.1672-1926.2012.06.1097

天然气地球科学 >

2012 , Vol. 23 >Issue 6: 1097 - 1103

DOI: https://doi.org/10.11764/j.issn.1672-1926.2012.06.1097

天然气地球化学

克拉苏构造带凝析油特征及其对油气成藏的指示意义

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1.中国石油勘探开发研究院，北京 100083; 2.中国石油天然气股份有限公司塔里木油田分公司勘探开发研究院，新疆库尔勒 841000； 3.中国石油化工股份有限公司胜利油田分公司东辛采油厂，山东东营 257000

卓勤功(1969-)，男，安徽萧县人，高级工程师，在读博士后，主要从事油气成藏研究. E-mail：zhouqg@petrochina.com.cn.

收稿日期: 2012-03-02

修回日期: 2012-07-14

网络出版日期: 2012-12-10

基金资助

大型油气田及煤层气开发国家科技重大专项“前陆盆地油气成藏规律、关键技术及目标评价”项目(编号：2008ZX05003)资助.

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Condensate Characteristics and Its Significance forHydrocarbon Accumulation in the Kelasu Structural Belt

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1.Research Institute of Petroleum Exploration and Development,CNPC,Beijing 100083,China； 2.Research Institute of Petroleum Exploration and Development,Tarim Oilfield Company,CNPC,Korla 841000,China 3.Dongxin Oil Production Factory,Shengli Oilfield Company,SINOPEC,DongYing 257000,China

Received date: 2012-03-02

Revised date: 2012-07-14

Online published: 2012-12-10

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摘要

相对于天然气而言，克拉苏构造带凝析油的研究较薄弱。在前人研究基础上，通过凝析油组分及其碳同位素分析，详细剖析了克拉苏构造带凝析油的成因、来源及其与天然气的关系。研究表明，克拉苏构造带凝析油与天然气不同源、不同期，凝析油主要为湖相烃源岩成熟演化阶段的产物，而天然气来源于高—过成熟的煤系烃源岩。该构造带东西段凝析油存在明显差异，含量上东少西多，碳同位素值东高西低，东段凝析油三环萜烷为正态分布，含有一定量的伽马蜡烷，来自黄山街组烃源岩；西段凝析油为黄山街组和恰克马克组烃源岩的混合产物，后端元凝析油三环萜烷以C19为主峰递减分布，含有极低的伽马蜡烷和丰富的重排藿烷和重排甾烷。凝析油的成熟度低于天然气的成熟度，且普遍具有气洗分馏特征，表明克拉苏构造带为“早油、晚气”成藏\.“早油”可聚集在冲断带完整背斜圈闭和膏盐岩侧向遮挡圈闭中;“晚气”主要在盐下断块或断背斜圈闭中成藏。

关键词： 凝析油; 天然气; 油气成藏; 勘探领域; 克拉苏构造带

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卓勤功，李勇，鲁雪松，王媛，邸晓文 . 克拉苏构造带凝析油特征及其对油气成藏的指示意义[J]. 天然气地球科学, 2012 , 23(6) : 1097 -1103 . DOI: 10.11764/j.issn.1672-1926.2012.06.1097

Abstract

Compared to natural gas,research on the condensate oil in the Kelasu structural belt is relatively poor.Based on the previous studies on natural gases and source rocks,through the analyses of composition and stable carbon isotopes of condensate oils,the origin,source and relationship to natural gases of the condensate oil have been studied in detail.It is indicated that condensate oil in the Kelasu structural belt has different origin and stage from the natural gases.The condensate oils areoriginated from the mature lacustrine source rocks,while natural gases are derived from mature to post-mature coal measures.Great differences exist between the condensate oils from the east to west tectonic belts.Condensate oils from the west have more content while lower stable carbon isotopic values compared to those from the east.In the east,the condensate oil has normal distribution of tricyclic terpane,with certain amount of gammacerane from the source rocks of Huangshanjie Group.In the west,the condensate is mixing products from the Huangshanjie and Qiakemake source rocks.The tricyclic terpane of condensate oil from the Qiakemake source rocks has decreasing distribution with C₁₉peak,with very low content of gammacernae and abundant rearranged hopanes and diasteranes.The maturity of condensate oil is lower than that of natural gas,and the condensate oil generally has gas-wash fractionation,indicating that the hydrocarbon accumulation in the Kelasu is dominated by oil in the early state and gas in the late stage.The early oil can be accumulated in the complete anticlines and plaster salt rock lateral traps in the thrust belt,while the late gas can mainly be accumulated in block and faulted anticline traps under salt rock.

Key words： Condensate; Natural gas; Hydrocarbon accumulation; Exploration direction; Kelasu structural belt

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