CAJ | 학술논문

准噶尔盆地南缘下部成藏组合勘探日趋重要，其主力烃源岩生烃潜力和排烃效率的研究亟待加强。根据排烃门限理论，利用生烃潜力法建立了准噶尔盆地南缘侏罗系烃源岩的生、排烃模式，并计算了烃源岩的生烃量、排烃量和排烃效率。研究表明，准噶尔盆地南缘侏罗系泥质烃源岩和煤层的排烃门限对应的镜质组反射率均为0.7％。侏罗系烃源岩的总生烃量为3973.84×108 t，总排烃量为1402.71×108 t，其中八道湾组烃源岩排烃量占总排烃量的69.85％。准噶尔盆地南缘侏罗系烃源岩的平均排烃效率为35.30％，不同层系不同岩性烃源岩，其排烃效率明显不同，泥质烃源岩排烃效率远大于煤层。综合分析认为，准噶尔盆地南缘侏罗系烃源岩生、排烃量大，排烃效率较高，下部成藏组合以侏罗系烃源岩为主力烃源岩，具有良好的资源潜力。
준갈이분지남연하부성장조합감탐일추중요，기주력경원암생경잠력화배경효솔적연구극대가강。근거배경문한이론，이용생경잠역법건립료준갈이분지남연주라계경원암적생、배경모식，병계산료경원암적생경량、배경량화배경효솔。연구표명，준갈이분지남연주라계니질경원암화매층적배경문한대응적경질조반사솔균위0.7％。주라계경원암적총생경량위3973.84×108 t，총배경량위1402.71×108 t，기중팔도만조경원암배경량점총배경량적69.85％。준갈이분지남연주라계경원암적평균배경효솔위35.30％，불동층계불동암성경원암，기배경효솔명현불동，니질경원암배경효솔원대우매층。종합분석인위，준갈이분지남연주라계경원암생、배경량대，배경효솔교고，하부성장조합이주라계경원암위주력경원암，구유량호적자원잠력。
The below oil-reservoir combination in the southern margin of Junggar basin is playing an important role in the hydrocarbon exploration,thus it is necessary to focus our attention on the research on hydrocarbon potential and expulsion efficiency of hydrocarbon of chief source.In this paper,based on the theory of hydrocar-bon-expulsion threshold,models of hydrocarbon generation and expulsion of the Jurassic source rocks were es-tablished and their quantity of hydrocarbon generation and expulsion,expulsion efficiency of hydrocarbon were calculated by using the hydrocarbon-generation potential method.The results showed that the vitrinite reflec-tance corresponding to hydrocarbon-expulsion threshold of both mudstone and coal seam is 0.7%.The total hy-drocarbon generation quantity and the total hydrocarbon expulsion quantity of the Jurassic source rocks are 3,973.84 ×108t and 1,402.71 ×108t respectively.Of all the hydrocarbon expulsion quantity,69.85 percenta-ges of them were expulsed by the source rocks in Badaowan Formation.The average hydrocarbon expulsion effi-ciency of Jurassic source rocks is 35.30%in the southern margin of Junggar basin.The hydrocarbon expulsion efficiency of source rock with different series of strata and different lithology is obviously different.The hydrocar-bon expulsion efficiency of mudstone is much higher than that of coal seam.In general,source rocks in the Ju-rassic have generated and expulsed large amounts of hydrocarbons,and the expulsion efficiency of hydrocarbon is quite high,indicating a promising resource prospect of the below oil-reservoir combination in the southern margin of Junggar basin.