CAJ | 학술논문

利用Re-Os同位素方法开展富含有机质的沥青、原油等的研究,是确定油气成藏时间和破坏时间有效的但极富挑战性的新途径,在国内尚无研究实例报道.以我国南方最大的古油藏之一的麻江古油藏中的沥青为主要对象,采用Re-Os同位素方法试图限定油气的成藏时间和破坏时间.研究表明,麻江古油藏的固体沥青Re、Os同位素质量分数分别在41.5×10~(-6)～642×10~(-6)和0.21×10~(-6)～12.15×10~(-6)之间,N(~(187)Re)/N(~(188)Os)比值较高,且变化范围较大,在270.90～4 074.99之间,Os同位素组成指示中等放射成因,其N(~(187)Os)/N(~(188)Os)比值在0.340 0～3.655 7之间变化.所有沥青样品的模式年龄在28～144 Ma之间变化,集中在85 Ma左右.通过沥青Re-Os同位素研究,结合详细地质资料,认为麻江古油藏的成藏时间为印支期-早燕山期(144 Ma之前),而油藏破坏时间为燕山晚期即85 Ma左右.
이용Re-Os동위소방법개전부함유궤질적력청、원유등적연구,시학정유기성장시간화파배시간유효적단겁부도전성적신도경,재국내상무연구실례보도.이아국남방최대적고유장지일적마강고유장중적력청위주요대상,채용Re-Os동위소방법시도한정유기적성장시간화파배시간.연구표명,마강고유장적고체력청Re、Os동위소질량분수분별재41.5×10~(-6)～642×10~(-6)화0.21×10~(-6)～12.15×10~(-6)지간,N(~(187)Re)/N(~(188)Os)비치교고,차변화범위교대,재270.90～4 074.99지간,Os동위소조성지시중등방사성인,기N(~(187)Os)/N(~(188)Os)비치재0.340 0～3.655 7지간변화.소유력청양품적모식년령재28～144 Ma지간변화,집중재85 Ma좌우.통과력청Re-Os동위소연구,결합상세지질자료,인위마강고유장적성장시간위인지기-조연산기(144 Ma지전),이유장파배시간위연산만기즉85 Ma좌우.
Rhenium-Osmium isotope system is a new and challenging method used to determined the hydrocarbon accumulation and date of desdtruction. This paper reports a Re-Os approach to date the hydrocarbon accumulation and destruction time of the Majiang paleo-oil pool, one of the largest paleo-oil reservoirs in South China. The Re and Os contents in the bitumen vary from 41.5×10~(-6) to 642×10~(-6) and 0.21×10~(-6) to 12.15×10~(-6), respectively. Their ~(187)Re/~(188)Os ratios are characterized by high and variable range of 270.90 to 4 074.99, while their ~(187)Os/~(188)Os ratios are moderately radiogenic, ranging from 0.340 0 to 3.655 7. The Re-Os model ages for the bitumen vary between 28 Ma and 144 Ma, with an average of ～85 Ma. With conbination of the documented geological researches, the paper suggests that the Majiang hydrocarbon deposit should be finally accumulated at ～144 Ma of Indosinian to Early Yanshanian period, and destroyed at ～85 Ma of Late Yanshanian period.