松辽盆地东岭地区幕式成藏分析

ANALYSIS OF EPISODIC POOL FORMATION IN DONGLING AREA, THE SONGLIAO BASIN

郭少斌

Guo Shaobin

中国地质大学, 能源地质系, 北京, 100083

China University of Geosciences, Beijing 100083, China

油气运聚期次、成熟度分析是一项非常有价值的研究工作。利用有机包裹体测温和包裹体中烃类组成特征、结合盆地模拟技术的精细时-温埋藏史、古地温史恢复来研究油气运聚期次、成熟度,可有效地指明成藏史。作者对松辽盆地南部东岭地区有机包裹体测温和包裹体中烃类组成的研究表明,油气运聚具有3期幕式成藏的特点:第一期为85.8Ma(姚家组沉积末期);第二期为78.6Ma(嫩江组沉积末期);第三期为66Ma(明水组沉积末期)。由于有机包裹体丰度及有机组分含量较低,加之后期构造破坏,不利于现今的油气勘探。

Primary organic inclusions in diagenetic minerals are widely used to determine the time of oil reservoir formation, oil expulsion, migration as well as hydrocarbon maturity. It is effective to indicate the timing and phases of hydrocarbons by integrating the analyses of the homogenization temperature and compositions of organic inclusions in diagenetic minerals with detailed modelling of paleotemperature and time-temperature burial history. As a case study, the authors examined the homogenization temperature and composition of organic inclusions in Dongling area, the Songliao Basin. The pool-forming history of reservoirs in this area we reconstructed by modelling burial and thermal history and analyzing homogenization temperature. The results indicated that there were at least three episodes of hydrocarbon pool formation and migration in the Early Cretaceous, occurring at about 85.8, 78.6 and 66 Ma respectively. The further compositional analysis of organic inclusions by Raman laser spectrum microprobe was consistent with the results from homogenization temperature analysis. Organic inclusion abundance and organic component content were lower, and the area underwent structure destruction in the late stages. These are unfavorable for present-day petroleum exploration.

https://doi.org/10.11781/sysydz200502134