CAJ | 학술논문

为了探究烃源岩不同热演化阶段生物标志化合物成熟度参数的演化规律及其专属指示意义。通过对辽河盆地桃10井Ⅲ型烃源岩进行HTHP生排烃热模拟实验，获取的液态烃产物饱和烃组分进行GC／MS分析，以模拟温度为成熟度标尺，检测出正构烷烃、类异戊二烯类烷烃、三环二萜烷、藿烷及甾烷系列中对热成熟度演化具有一定指示意义的生物标志化合物，并计算出参数指标。依据不同生物标志化合物对热作用的敏感程度不同，利用不同热敏感性的生标化合物比值指示热演化阶段。结果发现，随着模拟温度的升高，藿烷会受热作用影响形成三环萜烷，Tm会转化为Ts，20R型生物型异构体会向20S型地质异构体转化，所以∑三环萜烷／∑藿烷、Ts／Tm和C31－藿烷22S／（22S＋22R）参数对有机质热演化阶段可以起到较好的指示作用。而受热作用的差异性影响，参数C24－四环萜烷／∑藿烷、C30βα－莫烷／C30αβ－藿烷和C29－甾烷ββ／（αα＋ββ）则在成熟至过成熟阶段具有更强的指示意义。由此可见，样品不同热演化阶段均有其最佳适用的生标参数组合，这为正确利用成熟度参数判识该地区烃源岩成熟度演化阶段提供了一定的理论依据。
위료탐구경원암불동열연화계단생물표지화합물성숙도삼수적연화규률급기전속지시의의。통과대료하분지도10정Ⅲ형경원암진행HTHP생배경열모의실험，획취적액태경산물포화경조분진행GC／MS분석，이모의온도위성숙도표척，검측출정구완경、류이무이희류완경、삼배이첩완、곽완급치완계렬중대열성숙도연화구유일정지시의의적생물표지화합물，병계산출삼수지표。의거불동생물표지화합물대열작용적민감정도불동，이용불동열민감성적생표화합물비치지시열연화계단。결과발현，수착모의온도적승고，곽완회수열작용영향형성삼배첩완，Tm회전화위Ts，20R형생물형이구체회향20S형지질이구체전화，소이∑삼배첩완／∑곽완、Ts／Tm화C31－곽완22S／（22S＋22R）삼수대유궤질열연화계단가이기도교호적지시작용。이수열작용적차이성영향，삼수C24－사배첩완／∑곽완、C30βα－막완／C30αβ－곽완화C29－치완ββ／（αα＋ββ）칙재성숙지과성숙계단구유경강적지시의의。유차가견，양품불동열연화계단균유기최가괄용적생표삼수조합，저위정학이용성숙도삼수판식해지구경원암성숙도연화계단제공료일정적이론의거。
High temperature and high pressure hydrous pyrolysis experiments were conducted on type Ⅲ source rocks from Well Tao 10 in Liaohe Basin under various conditions to investigate the role of biomarker maturity parameters at dif-ferent thermal evolution stages.The expelled oils collected from these experiments were separated into saturated hydrocar-bons,aromatic hydrocarbons, non-hydrocarbons and asphaltene, and the saturated fractions were analyzed by GC/MS. Taking the simulation temperature as the scales of maturity,the biomarkers that are indicative of thermal maturity evolu-tion were detected from n-alkane,isoprenoid alkane,tricyclic terpane,tetracyclic terpane,hopane and sterane,and their parameter index were also calculated.Based on the different sensitivities of different biomarkers to thermal action,the ra-tio of different biomarkers may reflect different thermal stages.With the simulation temperature increasing,the hopanes may be turned into tricyclic terpanes,Tm may be turned into Ts,and the configurations of isomers will be transformed from 22R to 22S,thus the∑tricyclic terpane/∑hopane,Ts/Tm and C31-hopanes 22S /(22S+22R) may be good indi-cators of thermal stages.But in the stage of maturity to over-maturity,the C24-tetracyclic terpane/∑hopanes,C30βα-moret-ane /C30αβ-hopane and C29-sterane ββ/(αα+ββ) are more suitable indicators.Therefore,samples at different thermal evolution stages have their own optimal biomarker assemblages providing a theoretical basis for determining thermal evo-lution stage of source rocks by using maturity parameters in the study area.