| 柴达木盆地西部地区原油地球化学特征及油源对比 |
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| 引用本文： | 张迈,刘成林,田继先,庞皓,曾旭,孔骅,杨赛.柴达木盆地西部地区原油地球化学特征及油源对比[J].天然气地球科学,2020(1):61-72. |
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| 作者姓名： | 张迈 刘成林 田继先 庞皓 曾旭 孔骅 杨赛 |
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| 作者单位： | 中国石油大学（北京）油气资源与探测国家重点实验室;中国石油大学（北京）地球科学学院;中国石油勘探开发研究院;青海油田公司采油五厂 |
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| 基金项目： | 国家自然科学基金面上项目“氯化盐浓度对气源岩生成天然气组成的影响”（编号：41272159）;国家自然科学基金面上项目“碳沥青与钒矿物伴生机理研究”（编号：41272099）;国家自然科学基金面上项目“咸化湖盆条件下盐类对地层超压的作用机制研究”（编号：41872127）联合资助~~ |
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| 摘 要： | 柴达木盆地西部地区(简称柴西)新生界蕴藏着十分丰富的油气资源,勘探前景良好。根据原油和烃源岩中的生物标志物组成特征,对柴西原油的成熟度、沉积环境及生物来源等进行了探讨,从而进行原油成因类型划分以及油源对比。研究发现柴西原油显示出低成熟-成熟原油的特征且形成于水体盐度较高的还原性环境,有机质来源为混合源,低等水生植物输入量较大。根据原油的沉积环境、母质来源和成熟度特征,柴西原油可划分为4类:Ⅰ类来自于狮子沟-跃进地区,伽马蜡烷含量高,姥植比低,具有C27甾烷优势,有"翘尾"现象;Ⅱ类来自于切克里克-扎哈泉及南翼山-油泉子一带,伽马蜡烷含量较Ⅰ类低,具有C27甾烷优势,无"翘尾"现象;Ⅲ类来自于大风山、黄瓜峁等地区,具有C29甾烷优势,无"翘尾"现象;Ⅳ类来自于开特米里克地区,伽马蜡烷含量较前3类低,具有C27甾烷优势,无"翘尾"现象。油源对比结果表明,柴西原油主要来自E3和N1烃源岩。
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| 关 键 词： | 柴西 生物标志物 地球化学特征 油源对比 |
Characteristics of crude oil geochemical characteristics and oil source comparison in the western part of Qaidam Basin |
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| ZHANG Mai,LIU Cheng-lin,TIAN Ji-xian,PANG Hao,ZENG Xu,KONG Hua,YANG Sai.Characteristics of crude oil geochemical characteristics and oil source comparison in the western part of Qaidam Basin[J].Natural Gas Geoscience,2020(1):61-72. |
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| Authors: | ZHANG Mai LIU Cheng-lin TIAN Ji-xian PANG Hao ZENG Xu KONG Hua YANG Sai |
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| Affiliation: | (State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;PetroChina Exploration and Development Research Institute,Langfang 065007,China;No.5 Oil Production Plant of Qinghai Oilfield Company,Dunhuang 736200,China) |
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| Abstract: | The Cenozoic in the western part of the Qaidam Basin is rich in oil and gas resources and has good prospects for exploration. Based on the biomarker composition characteristics of crude oil and source rocks,this paper discusses the maturity,sedimentary environment and organic matter sources of crude oil,so as to classify crude oil genesis and oil source comparison. Studies have found that crude oil has a lower maturity and is formed in a reducing environment with high salinity. The source of organic matter is a mixed source,and the input of lower aquatic plants is large. Crude oil can be classified into four categories based on the crude oil deposition environment,parent material source and maturity characteristics. The first kind of crude oil is mainly from the Shizigou-Yuejin areas,with high gamma wax content,low planting ratio,C27 decane advantage,and"hooktail"phenomenon;the second kind of crude oil is mainly from the Cherick-Zhahaquan areas and the NanyishanYouquanzi areas,which has the advantage of C27 decane and no"hook-tail"phenomenon,the content of gamma wax is lower than the former;the third kind of crude oil is mainly from Dafengshan and Huangguamao regions,with C29 decane advantage and no"hook-tail"phenomenon;the fourth kind of crude oil is mainly from the Kaitemilik region,with C27 decane advantage and no"hook-tail"phenomenon,and the content of gamma wax is lower than that of others. The result of oil-source correlation shows that the crude oil is dominantly derived from E3 and N1 source rocks. |
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| Keywords: | Western Qaidam Basin Biomarker Geochemical characteristics Oil-source correlation |
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