板桥斜坡原油类型划分及其意义

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英文篇名：Classification of Crude Oil Types on Banqiao Slope and Its Significance 作者：邹磊落 ; 代昆 ; 汪晓敏 ; 汪津 ; 白晶 ; 王冠 英文作者：ZOU Lei-luo;DAI Kun;WANG Xiao-min;WANG Jin;BAI Jing;WANG Guan;Research Institute of Exploration and Development,Dagang Oilfield of PetroChina; 关键词：板桥斜坡 ; 原油类型 ; 油源对比 ; 烃源岩 英文关键词：Banqiao slope;;crude oil type;;oil source comparison;;source rock 中文刊名：承德石油高等专科学校学报 英文刊名：Journal of Chengde Petroleum College 机构：中国石油大港油田公司勘探开发研究院; 出版日期：2019-04-15 出版单位：承德石油高等专科学校学报 年：2019 期：02 基金：中国石油天然气集团公司重大科技专项(大港油区效益增储稳产关键技术研究与应用):2018E-11-01 语种：中文; 页：12-16 页数：5 CN：13-1265/TE ISSN：1008-9446 分类号：P618.13

摘要

为深入认识板桥斜坡油气成藏特征,明确其原油成因类型和来源,应用饱和烃生物标志化合物、原油碳同位素组成特征等地球化学资料,对板桥斜坡不同部位不同层系的12种原油进行了油油和油源对比研究。分析表明,板桥斜坡原油基本为成熟原油,具有三种成因类型:第一类原油碳同位素组成较重,正构烷烃分布完整,伽马蜡烷含量低,来源于沙三段烃源岩正常成熟的原油,主要分布在板桥低斜坡;第二类原油主要分布在高斜坡,埋藏较浅,发生一定程度生物降解,碳同位素组成相对较轻,正构烷烃不完整,Pr/Ph普遍小于1,伽马蜡烷含量低,成熟度要比第一类原油略低,说明该类原油在沙三段烃源岩供烃成藏之后,由于断层活动,油气向高部位运移,形成次生油气藏;第三类原油碳同位素组成最轻,正构烷烃极不完整,成熟度要也比第一类原油略低,但伽马蜡烷含量高,可能有沙一段烃源岩对其贡献作用。
        In order to understand the characteristics of Banqiao slope formation and to clarify the type of crude oil formation, by using geochemical data such as saturated hydrocarbon biomarker compounds and carbon isotope composition of crude oil, 12 crude oils from different strata of Banqiao slope were studied. The analysis shows that Banqiao slope crude oil is basically mature crude oil and has three genetic types. The first type of crude oil has a heavier carbon isotope composition, a complete distribution of n-alkanes, and a low content of gammacerane, which originates from normal mature hydrocarbon source rocks in the three sections of sand. Crude oil is mainly distributed on the low slope of Banqiao. Category 2 crude oil is mainly distributed on high slopes, buried shallow; biodegradation occurs to some extent; carbon isotope composition is relatively light; n-alkanes are incomplete; PR/PH is generally less than 1; gammacerane content is low; maturity is slightly lower than category 1 crude oil. It is indicated that after the hydrocarbon supply accumulation of hydrocarbon source rocks of Sha-3 member, the oil and gas moved to the high part due to fault activities, forming a secondary oil and gas reservoir. Category 3 crude oil has the lightest carbon isotope composition; n-alkanes are extremely incomplete; and the maturity is slightly lower than that of Class 1 crude oil, but the content of gammacerane is high, and it may have a hydrocarbon source rock contribution of Sha-1 member.

引文

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