摘要
随着勘探开发的不断深入,古龙青山口组页岩油已成为松辽盆地主要勘探对象。通过对GY 3井钻井液气及岩屑罐顶气碳同位素随钻检测,钻井液气碳同位素δ^(13)C_(1)<δ^(13)C_(2)<δ^(13)C_(3)为有机油型气特征,δ^(13)C_(1)-δ^(13)C_(2)-δ^(13)C_(3)有机不同成因烷烃气鉴别图板投点显示古龙页岩油为Ⅱ油型油气;钻井液气不同烷烃碳同位素分馏模拟计算表明,本地烃源岩演化程度介于1.3~1.5之间,属于高成熟阶段;甲烷碳同位素(δ^(13)C_(1))含量随纵向深度的反向变化说明青二段为外来补给型页岩油,青一上半段为原地生烃滞留型页岩油;根据不同时间岩屑罐顶气(1 d、3 d、7 d)碳同位素分馏特征分析表明,青一下半段含油气压力最高,其次为青一上半段,青三段底部也具有较好的含油气压力。碳同位素录井不仅可用来分析油气来源和成因,还可用来分析致密储层油气充注特征,从而为油气勘探开发部署提供依据。
With the deepening of exploration and development,Gulong Qingshankou Fm shale oil has become the main exploration object in Songliao Basin.By detecting the carbon isotope of drilling fluid gas and cuttings gas while drilling in GY 3well,the carbon isotope of drilling fluid gasδ^(13)C_(1)<δ^(13)C_(2)<δ^(13)C_(3)is the characteristic of medium oil type gas in organic gas,and the projection point ofδ^(13)C_(1)-δ^(13)C_(2)-δ^(13)C_(3)organic alkane gas identification chart shows that gulong shale oil is II type oil and gas;the simulation calculation of carbon isotope fractionation of different alkanes in drilling fluid gas shows that the evolution degree of local source rocks is between 1.3 and 1.5,which belongs to high maturity stage;the reverse change of methane isotopic(δ^(13)C_(1))content with vertical depth shows that the second Member of Qingshankou Fm is an externally supplied shale oil,and the upper half of the first Member of Qingshankou Fm is an in-situ hydrocarbon generation and retention shale oil;according to the carbon isotope fractionation characteristics of rock debris capping gas(1 d,3 d and 7 d)at different times,the oil and gas in the lower half of the first Member of Qingshankou Fm is the highest,followed by the upper half of the first Member of Qingshankou Fm,and the bottom of the third Member of Qingshankou Fm also has good oil and gas pressure.Carbon isotope logging can be used to analyze not only the source and genesis of oil and gas,but also the oil and gas filling characteristics of tight reservoirs,and therefore provide basis for oil and gas exploration and deployment.
作者
肖光武
杨世亮
XIAO Guangwu;YANG Shiliang(No.1 Mud Logging Company of CNPC Daqing Drilling&Exploration Engineering Corporation,Daqing,Heilongjiang 163411,China)
出处
《录井工程》
2022年第4期6-12,共7页
Mud Logging Engineering
基金
中国石油天然气股份公司重大科技专项“松辽盆地北部石油精细勘探技术完善与规模增储”(编号:2016E-0201)
关键词
古龙
青山口组
页岩油
碳同位素
分馏
成熟度
成因
Gulong
Qingshankou Fm
shale oil
carbon isotope
fractionation
maturity
origin
作者简介
肖光武,高级工程师,1980年生,2009年硕士毕业于成都理工大学岩石学、矿物学、矿床学专业,现在中国石油大庆钻探工程公司地质录井一公司从事录井解释和新技术应用研发工作,通信地址:163411黑龙江省大庆市让胡路区银海街1号,电话:(0459)5684299,E-mail:xiaoguangwu@petrochina.com.cn.
