【作者】 刘大为；

【导师】 薛海涛；

【作者基本信息】 东北石油大学 ， 地球化学， 2012， 硕士

【摘要】 自2003年吉林油田对油气勘探方向进行了战略转移以来，吉林油田根据英台断陷的源岩和储层条件，将其定位为松辽盆地南部深层油气勘探的重要接替区，并相应部署了龙深101、龙深2等井，均于营城组火山岩中获得高产气流。所以英台断陷的烃源岩的生、排烃量、主力源岩为哪套和天然气成因等问题都对英台断陷今后的勘探部署具有重要的意义。本文对英台断陷深层烃源岩生烃潜力进行了定性和定量评价。烃源岩的定性评价结果表明了英台断陷的主力源岩是营城组和沙河子组源岩，而且其丰度均达到了中等-好的级别；类型以Ⅱ1和Ⅱ2型为主，有少量Ⅲ型；演化程度处于高成熟和过成熟演化阶段，是较好的气源岩。并通过测井地化的方法对研究区的TOC进行了预测，勾绘了营城组和沙河子组的TOC等值线图。由于研究区部分地区（龙深1井区）有岩浆侵入体发育，所以将侵入体的热传导模型和化学动力学模型结合，评价侵入体对烃源岩演化的影响。定量评价结果表明，侵入体明显影响了烃源岩的生烃及演化，使有机质的生烃期提前。此时由于上覆盖层并没有形成，所以生成的天然气都已散失。但侵入体发育范围较小，对全区资源量影响不大。最后计算得出英台断陷的总生气量为11.2×1012m3，其中营城组为6.78×1012m3，沙河子组为4.46×1012m3，营城组和沙河子组的生气比例约为1.5：1。营城组源岩为主要供气源岩。根据轻烃指标判断英台断陷天然气具有凝析油伴生气和高温裂解气的特征；根据碳同位素系列判断的结果是英台断陷烃类气主要为凝析油伴生气和煤型气的混合气。更多还原

【Abstract】 In2003, Jilin Oilfield had shift strategic in the direction of oil and gas exploration. JilinOilfield according Yingtai fault depression’s to the source rock and reservoir conditions,positioning it as a replacement area of deep oil and gas exploration of the southern SongliaoBasin. And deployed the well Longshen101, Longshen2. They both get high-yield gas flowin the Yingcheng volcanic reservoirs. So some questions about the source rocks and thegeneration of the natural gas are very important for the exploration and deployment ofYingtai fault depression.Therefore the hydrocarbon generation potential of hydrocarbon from source rock ofYingtai fault depression was researched qualitatively and quantitatively in this paper.Theresult of source rocks qualitative evaluation shows that the main source rocks of Yingtaifault depression is Yingchang Formation and Shahezi Formation and the abundance of themare at the middle-good level. Most of the are type Ⅱ1and Ⅱ2, a small amount of type Ⅲ.They are all at high mature or over mature level. So they are good gas source rocks.According to the logging geochemistry, predicted Toc of the study area and drawing the Toccontour map of Yingcheng and Shahezi Formation. In some areas of the study area (WellLongshen1) are developed magma intrusions. So we combined the heat conduction modeland the chemical kinetics model together, take the evaluation of intrusions on the source rocksevolution. The result shows that intrusions has an effect on making the stage of hydrocarbongeneration early. At that time the cap was not formed, so the natural gas had been lost. But therange of the intrusions is small, so there is little effect on the total resource. Yingtai faultdepression had generated total11.2×1012m3gas, the Yingcheng Formation had generated6.78×1012m3, Shahezi Formation had generated4.46×1012m3. The ratio of gas that Shaheziand Yingcheng Formation had generated is1:1.5. So the Yingcheng Formation is the main gassource rocks. According to light hydrocarbon indicators can judge that the gas of Yingtai faultdepression has the characteristics of condensate co-existing gas and high-temperaturepyrolysis gas. According to carbon isotope can judge the gas of Yingtai fault depression ismainly condensate co-existing and coal type gas.更多还原