CAJ | 학술논문

选择库车坳陷和雅布赖盆地两个烃源岩热演化系列，在 GC/MS分析的基础上探讨了二苯并噻吩类成熟度参数，如 MDR 4、 MDR 2,3、 MDR、 MDR’等的热演化特征，首次提出利用甲基二苯并噻吩分布指数（ MDBI）作为研究区有效的新型成熟度标尺。结果表明，在成熟至高成熟阶段 MDR 4和 MDR 2,3主要受热力作用控制，在研究区应用效果良好； MDR在较高热演化阶段变化速率显著增加，而且适合于Ⅱ 2和Ⅲ型有机质。甲基二苯并噻吩分布指数与其他有效参数，如 Ro、 tmax和 MPI等之间的相关系数矩阵进一步证实，在 Ro=0.67％～ 1.22％范围内， MDBI能够准确提供烃源岩热演化历史方面的信息。该指数的提出还有望为原油热成熟度的判识提供一个新的途径。
선택고차요함화아포뢰분지량개경원암열연화계렬，재 GC/MS분석적기출상탐토료이분병새분류성숙도삼수，여 MDR 4、 MDR 2,3、 MDR、 MDR’등적열연화특정，수차제출이용갑기이분병새분분포지수（ MDBI）작위연구구유효적신형성숙도표척。결과표명，재성숙지고성숙계단 MDR 4화 MDR 2,3주요수열력작용공제，재연구구응용효과량호； MDR재교고열연화계단변화속솔현저증가，이차괄합우Ⅱ 2화Ⅲ형유궤질。갑기이분병새분분포지수여기타유효삼수，여 Ro、 tmax화 MPI등지간적상관계수구진진일보증실，재 Ro=0.67％～ 1.22％범위내， MDBI능구준학제공경원암열연화역사방면적신식。해지수적제출환유망위원유열성숙도적판식제공일개신적도경。
The characteristics for the thermal evolution of dibenzothiophenes maturity parameters, such as 4 MDBT/DBT, 2,3 MDBT/DBT, 4 MDBT/1 MDBT and 4 MDBT/(4 MDBT＋ 1 MDBT), have been discussed on the basis of GC/MS analysis for the two selected suites of source rocks in Kuqa depression, Tarim basin and Yabrai basin, Hexi Zoulang area. It is the first report that methyldibenzothiophene distribution index (MDBI), namely, 4 MDBT/(DBT＋ 4 MDBT＋ 2,3 MDBT＋ 1 MDBT) increasing with the maturation, which primarily follows the principle of chemical thermodynamics, has been proposed as a new effective parameter of maturity in the investigated basin or depression. The results indicate that MDR 4 and MDR 2,3, which are thermodynamically controlled, are better maturity parameters to evaluate the thermal maturation of source rocks in the areas. It is found that the rate of MDR ratio appears a remarkable increase in a little high maturation, and MDR is very reliable for maturity determination of type Ⅱ 2 and Ⅲ of organic matters. The correlation matrix for MDBI and other effective maturity indicators, such as Ro, tmax and MPI, further demonstrates that MDBI may accurately provide the information about the history of thermal evolution for source rocks within the vitrinite reflectance (Ro) values varying from 0.67％ to 1.22％ . Moreover, the new index presented in this paper implies a new access to identify the thermal maturation of oils.