CAJ | 학술논문

三塘湖盆地马朗凹陷发现的二叠系芦草沟组页岩油，具有较好的油气资源潜力，其形成与富集机理与常规油气藏有很大差异。页岩油运移机制是页岩油形成机理的重要部分，在岩心观察、薄片鉴定结合地球化学分析化验及地质条件综合分析的基础之上，重点研究了页岩油运移的动力、通道、方向、距离和效率等方面。结果表明，页岩油在源内的运移效应不明显，油气的富集非源内规模性运移聚集结果；油气垂向向源外的运移效应较为显著，活动的大规模断裂会降低源内页岩油丰度。页岩油的初次运移以生烃造成的地层超压为动力，通过干酪根网络、纹层间及微裂缝发生了小尺度的运移，油气大部分滞留原地，运移效率极低。在输导断裂发育的地区，泥页岩生成的油气发生了垂向向上的二次运移，在芦草沟组上覆地层聚集成藏。页岩油的这种运移机制决定了页岩油连续分布、油水分异差、油气聚集不受构造控制及断裂活动区油气丰度较低的特点。
삼당호분지마랑요함발현적이첩계호초구조혈암유，구유교호적유기자원잠력，기형성여부집궤리여상규유기장유흔대차이。혈암유운이궤제시혈암유형성궤리적중요부분，재암심관찰、박편감정결합지구화학분석화험급지질조건종합분석적기출지상，중점연구료혈암유운이적동력、통도、방향、거리화효솔등방면。결과표명，혈암유재원내적운이효응불명현，유기적부집비원내규모성운이취집결과；유기수향향원외적운이효응교위현저，활동적대규모단렬회강저원내혈암유봉도。혈암유적초차운이이생경조성적지층초압위동력，통과간락근망락、문층간급미렬봉발생료소척도적운이，유기대부분체류원지，운이효솔겁저。재수도단렬발육적지구，니혈암생성적유기발생료수향향상적이차운이，재호초구조상복지층취집성장。혈암유적저충운이궤제결정료혈암유련속분포、유수분이차、유기취집불수구조공제급단렬활동구유기봉도교저적특점。
The shale oil potential is high in the Permian Lucaogou Formation in Malang Sag ,Santanghu Basin .Its genetic mechanism and accumulation patterns are greatly different from those of conventional reservoirs .Migration is a major com-ponent of genetic mechanism of shale oil .Based on core and thin section observation ,and in combination with geochemical data and geological condition analysis ,this paper studied the migration mechanism of shale oil ,including dynamic force , pathway ,direction ,distance ,efficiency and so on .Migration effect of shale oil within source rocks is insignificant ,thus shale oil reservoirs are not the result of oil migration and accumulation within source rocks .In contrast ,vertical migration effect of shale oil out of source rocks is significant .The existence of large active faults may lower the abundance of shale oil in source rock .High formation pressure caused by hydrocarbon generation is the main dynamic force of primary migration .Af-ter small scale migration through kerogen network ,interlamination and microfractures ,most of the oil generated retain in place ,and the migration efficiency is very low .On the contrary ,in areas where carrier faults are well developed ,the oil can migrate vertically along the faults and accumulate in the overlying reservoirs of the Lucaogou Formation .This migration mechanism of shale oil determines the characteristics of shale oil play such as continuous distribution ,no obvious oil-water contact ,no influence of structure on oil accumulation ,and low abundance of oil in areas with active faults .