【作者】 杨兰君；

【导师】 罗小平；

【作者基本信息】 成都理工大学 ， 矿产普查与勘探， 2010， 硕士

【摘要】 基于辽东湾盆地的基础资料和研究成果，综合应用石油地质、油气地球化学、沉积学原理、钻井及测井等理论和方法，通过对该地区构造特征及演化、地层沉积特征、油气地化特征、烃源岩特征、油气源分析及油气成藏的研究，认为辽西凹陷主要烃源岩层为沙三段，次要烃源岩层为沙一段、东三段。横向上从机质丰度，有机质类型，有机质成熟度上来比较，辽西凹陷北洼的烃源岩条件好于中洼。JZ25-1（S）地区油气储量丰富，油气分布关系复杂，纵向上主要含油层段是东营组三段、沙河街组二段和沙河街组三段，沙河街组一段和沙河街组四段油气储量规模较小，为次要油气层。运用油-油对比发现JZ25-1地区原油地球化学特征相似，具备低硫、凝析油～轻质油的特点.通过正构烷烃色谱特征对比发现，正构烷烃奇偶优势不明显。在成熟度方面，表现为成熟原油的特点,但JZ25-1S地区原油成熟度略高于JZ25-1地区原油。其母源沉积水体具有一定的盐度，母质以藻类等浮游动植物为主，JZ25-1地区原油具有同源性；而JZ25-1S地区除JZ25-1S-4D外，表现出了明显的生物降解作用，具有同源性。运用油-源对比发现，JZ25-1地区原油融合了辽西凹陷沙三上、中、下亚段的共同特征，该地区原油应该主要来源于辽西凹陷的沙三段烃源岩。但是，也不能排除上部沙一段烃源岩生成的原油混入的可能性。JZ25-1S地区原油来源比较复杂，大体上可以分为两类。该地区主体原油具有沙三下段原油与沙一段混源的特征；以JZ25-1S-4D为代表的第2类原油则来自辽西沙三下段。该区沙二段、沙三段储层包裹体特征及均一温度和该区相应储层所经历的生烃史表明，沙二段、沙三段储层大规模油气充注成藏的时期主要为东一段沉积末期，距今约26-20Ma。更多还原

【Abstract】 Based on the abundant basic data and achievements, combined application thetheory and methods abaut petroleum-geology,oil-geochemical,sedimentology,drilling,logging and so on. through the research of tectonic feature and evolution , oilgeochemical,source rock characteristic, petroleum source correlation and hydrocarbonaccumulation, we consider that the main source rocks of Liaoxi depression are Es3segment ,the secondary source rocks are Es1 segment, Ed3 segment.The north seg isbetter than the middle seg from the organic matter,the oranic abundance,the orgnicmaturity.We consider that there is rich oil reserve in JZ25-1(S). In longitudinaldirection, the main oil-layer are Ed3 segment,Es2 segment and Es3 segment the oil-gasreserve of the Es1 segment and Es4 segment is relatively small,they are secondaryreservoir.We found that the crude oil of JZ25-1 area have the same geochemistrycharacteristics with a lower density and lower sulfer content by using the oil-oilcorrelation technique.Comparision of the n-alkane’s GC diagrams shows thatodd-even don’t appear in the crude oil. the crude oil is maturate，but the oil ofJZ25-1S is materater than the oil of JZ25-1.The source rocks were deposited undersaline water environment.the organic sources main were significant algae ,havinghomology.and the oil of JZ25-1S were biodegraded serious except JZ25-1S-4D.By using the oil–source rocks correlation technique,we think that the oil of thisarea may be originated from Es3 segement of Liaoxidepression.we cann’t preclude thecontribution of Es1 segmengt.The main crude oil of JZ25-1S originate from the lowsegment of Es3 and Ed3.The class 2 oil (JZ25-1S-4D)only originate from the lowsegment of Es3 segment. Make use of measurement of enclosure’s homogenization temperature,hydrocarbon generation history, we consider that the most important period ofhydrocarbon’s migration and accumulation of Es2 segment,Es3 segment is at the finalstage of Dongyingthe Ed1 (26Ma~20Ma).更多还原