烷基二苯并噻吩的分布与有机质成熟度关系的探讨  

Study on the correlation of methyldibenzothiophenes distribution and organic maturity

作　　者：霍秋立 李振广 付丽 高敏[2] 

机构地区：[1]大庆油阳有限责任公司勘探开发研究,黑龙江大庆163712 [2]大庆油田有限责任公司第一采油厂,黑龙江大庆163001

出　　处：《大庆石油地质与开发》2008年第2期32-35,38,共5页Petroleum Geology & Oilfield Development in Daqing

摘　　要：选取了海拉尔断陷盆地及松辽坳陷盆地源岩进行了烷基二苯并噻吩异构体比值,4-甲基二苯并噻吩(4-MDBT)/1-甲基二苯并噻吩(1-MDBT),2,4-二甲基二苯并噻吩(2,4-DMDBT)/1,4-二甲基二苯并噻吩(1,4-DMDBT)及4,6-二甲基二苯并噻吩(4,6-DMDBT)/1,4-二甲基二苯并噻吩(1,4-DMDBT)与有机质成熟度关系探讨,表明烷基二苯并噻吩异构体比值随源岩埋深和镜质组反射率Ro的增加呈现规律性增大,且具有良好的线性关系,与源岩沉积环境和有机质类型关系不大,主要受热力作用控制,是反映有机质成熟度的良好指标。采用该指标研究成熟度时,不同地区应分别建立不同的Ro线性回归方程。分别建立了海拉尔盆地和松辽盆地源岩Ro与烷基二苯并噻吩异构体比值参数关系方程:Ro(%)=0.21(2,4-DMDBT/1,4-DMDBT)+0.44和Ro(%)=0.23(2,4-DMDBT/1,4-DMDBT)+0.46。烷基二苯并噻吩异构体比值参数为贫镜质体的源岩和原油的成熟度评价研究提供了一个新手段。The relationship between the methyldibenzothiophenes parameters such as 4-MDBT/1-MDBT, 2, 4-DMD- BT/1, 4-DMDBT and 4, 6-DMDBT/1 , 4-DMDBT and organic maturity （ well depth or vitrinite reflectance） has been discussed on the basis of analysis for different kind of source rock in Hailaer faulted basin and Songliao depression basin. The results indicate that 4-MDBT/1-MDBT, 2, 4-DMDBT/1, 4-DMDBT and 4, 6-DMDBT/1, 4-DMDBT increase regularly with maturation of source rock. These ratios are not sensitive to the lithology of source rocks or organic facies. It seemed that they are only thermodynamically controlled. Comparing with other maturity parameters such as MP/1, MP/2, F1, F2 , the correlation coefficient of methyldibenzothiophenes parameters with well depth or Ro are much better. They can be used as indicators of maturity. In different basin or different area methyldibenzothiophenes parameters have different evolutionary trends, it is necessary to established own regression equation in study area. The regression equation of methyldibenzothiophenes parameters and Ro in Hailaer Basin and the Songliao Basin are established： Ro （%） = 0.21 （2, 4-DMDBT/1, 4-DMDBT） ＋ 0.44 and Ro （%） = 0.23 （2, 4-DMDBT/1, 4-DMDBT） ＋ 0. 46. The study suggest that it will be more significant to use these parameters to evaluate the maturity of lean vitrinite source rocks and oil.

关 键 词：烷基二苯并噻吩 成熟度 烃源岩 相关系数 

分 类 号：TE122.1[石油与天然气工程—油气勘探]