典型断陷湖盆C₂₇三降藿烷参数演化及其控制因素

     陈中红等. 沉积学报,2010,28(3):635-642

为研究实际地质体或地质剖面中的C₂₇三降藿烷生物标志物同分异构体的演化、分布和主要控制因素，对目前关注的东营凹陷深层烃源岩进行了较密集的取心、测试和分析（丰8、丰深1、史121、史126井），在此基础上，对东营凹陷古近系沙河街组三段和四段和孔店组等主要烃源岩层系（深度上横跨2700m~4200m）进行了详细的研究，结果表明：在2.7km~3.572km，除Tm的相对含量随埋藏深度增加总体降低以外，其他参数Ts、Ts+Tm的相对含量（相对于191质谱图中总离子流的百分含量）及Ts/Tm及Ts/(Ts+Tm)值均总体上随埋藏深度增加总体呈升高趋势；而在3.572km~4.2km，上述各参数随埋藏深度的关系均发生了“逆转”。研究发现，C₂₇三降藿烷成熟度参数的分布除与其同分异构体的生成速率、热稳定性及异构化作用密切相关外，还与一些高分子化合物在裂解过程中向Ts的转化有关；热力作用宏观上控制了相关参数的分布，相关参数的逆转与碳酸盐矿物的富集密切相关，碳酸盐矿物对C₂₇三降藿烷成熟度参数具有抑制作用或迟缓效应。

摘要：C₂₇藿烷，生物标志物，成熟度参数，热演化，碳酸盐岩，东营凹陷

The Evolution and Its Controlling Factors of the Maturation Parameters Relative to C₂₇ Trisnorhopane in the Representative Faulted lake-basin：Taking the Paleogene System in Dongying Sag as an Example

CHEN Zhonghong, et al. ACTA SEDIMENTOLOGICA SINICA, 2010,28(3):635-642

The Paleogene system in Dongying sag was the representative faulted lake-basin and also the typed co-sedimentary system of evaporate and mud rocks in the Eastern of China. To investigate the evolvement rule and its controlling factors on the maturation parameters relative to C₂₇ trisnorhopane, the deep formation in the Paleogene System of four deep wells (Feng-8 well, Fengshen-1 well, Shi-121 well and Shi-126 well) in the sag were intensively cored, tested and dissected, and in this base, the maturation parameters relative to C₂₇ trisnorhopane in the main source rocks (the Member 3, Member 4 in Shahejie Formation and Member 2 in Kongdian Formation in the Paleogene System, the depth across from 2700m to 4200m) were investigated.

The results demonstrate that: in the depth across from 2.7km to 3.572km, the content of Ts and Ts+Tm (relative to the whole content of ions in the test of mass spectrogram 191) and the value of Ts/Tm, Ts/(Ts+Tm) increase with the buried depth added as a whole except the content of Tm, however in the depth across from 3.572km to 4.2km, the distribution of all the above parameters show the reversion. The research turn out besides the close relation between the maturation parameters relative to C₂₇ trisnorhopane and the generation velocity of the isomers, thermal stability and isomerization of the isomers, the cracking of some polymeric compounds contribute to the increase of the relative amount of the Ts; thermodynamic activity control the distribution of these parameters primarily, while the relative low value of Ts/Tm, Ts/(Ts+Tm) in the salted deposition system show the influence of the sedimentary environment on the parameters; the well corresponding of the reversion of the maturation parameters to the high content of the carbonate minerals indicate the restrain and tardy effect of carbonate minerals on the thermal evolution of the organic matter.       .    

Key words: C₂₇ trisnorhopane, maturation parameters, biomarker, thermal evolution, carbonate rocks, Dongying sag.  

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