渤海盆地中部凹陷油气地球化学勘查  

Geochemical investigation for oil and gas in middle sag of Bohai Basin

作　　者：刘海生[1] 艾星涛[1] 马万云[1] 陈瓞延[1] 

机构地区：[1]清华大学原子分子纳米科学教育部重点实验室,北京100084

出　　处：《石油大学学报（自然科学版）》2005年第1期17-21,共5页Journal of the University of Petroleum,China(Edition of Natural Science)

基　　金：国家海洋"863"资助项目(820 03探1);中国博士后基金资助项目

摘　　要：利用气相色谱质谱(GC MS)、胶束电动毛细管色谱(MECC)分析技术对渤海中部凹陷油气地球化学进行了勘查。结果表明,渤海中部凹陷2m深沉积物中苯和甲苯的平均体积分数分别为0.107×10-6和0.130×10-6;返浆脱气样中的苯和甲苯的平均体积分数为0.844×10-6和0.195×10-6;利用激光频率调制吸收光谱测量技术测得井中返浆气样甲烷碳同位素比δ13C1为-21‰～-72‰。钻探结果证实,调查区内8口油气井中的6口井位于沉积物甲苯异常范围内,5口井位于苯异常范围内。苯和甲苯异常呈顶端聚集模式。返浆脱气样中的苯和甲苯浓度在油气层上方300m左右明显升高。研究区内天然气以油型气和煤成气为主,含少量生物成因气和深部气。The geochemical investigation for oil and gas in middle sag of Bohai Basin was done. Petroleum hydrocarbons of benzene, toluene and δ^(13)C_1(^(13)C_1/^(12)C_1) in different matrices such as sediment, slurry gas were determined using gas chromatograph-mass (GC-MS), micellar electrokinetic capillary chromatography (MECC) and laser frequency modulation absorption spectroscopy. The mean volume fraction of benzene and toluene is 0.107×10^(-6) and 0.130×10^(-6) in sediment respectively, 0.844×10^(-6), 0.195×10^(-6) in slurry gas respectively and δ^(13)C_1 is -21‰～-72‰. The results indicate that the contents of benzene and toluene become high on the top of reservoir formations of 300 meters. The oil and gas survey results were tested by three oil wells, three oil and gas wells and two gas wells. The natural gas originated from oil and coal reservoir formations mainly, a little from biogenic gas and deep gas reservoir formations.

关 键 词：海盆 渤海 盆地 勘查 异常 生物成因 碳同位素 油气地球化学 凹陷 井位 

分 类 号：TE122[石油与天然气工程—油气勘探] P618[天文地球—矿床学]