论文部分内容阅读
塔里木盆地海相寒武系—奥陶系烃源岩的热解、干酪根元素、高温热解气相色谱及黄金管封闭热模拟实验揭示,海相Ⅰ,Ⅱ型干酪根的天然气生成成熟度上限或“生气死亡线”为镜质体反射率3.0%;以煤为代表的Ⅲ型有机质的“生气死亡线”最高可达镜质体反射率10%.不同类型有机质生成天然气的极限量存在明显差别.干酪根元素物质平衡法计算,海相Ⅱ型干酪根在Ro>1.5%以后演化阶段的生气量极限小于185m3/t(TOC),不足其总生烃量的30%;在Ro>2.0%演化阶段的生气量极限小于110m3/t(TOC),不足其总生烃量的20%.岩石热解法获得的相同演化阶段天然气生成量仅为干酪根元素质量平衡法计算值的1/10左右.黄金管封闭高温高压热模拟和高温热解方法获得的生气量介于两者之间,镜质体反射率1.3%以后的生气量极限为60~90m3/t(TOC).岩石热解法获得的生气量是最小生气潜力,而干酪根元素质量平衡法获得的生气量是其极限生气潜力,实际生气量应低于元素质量平衡法计算出来的生气量极限.
Pyrolysis, kerogen elements, high temperature pyrolysis gas chromatography and gold tube closed thermal simulation of the marine Cambrian-Ordovician source rocks in the Tarim Basin reveal that the upper limit of the maturity of natural gas generated by the marine types I and II kerogens Or “angry death line” for the vitrinite reflectance of 3.0%; type III organic matter represented by coal “angry death line ” up to 10% vitrinite reflectance of different types of organic matter to generate natural gas There is a significant difference between the maximum and minimum limits for the amount of hydrocarbon generation in the kerogen type II kerogen, which is less than 185 m3 / t (TOC) for the marine type II kerogen after Ro> 1.5% In Ro> 2.0% of the evolution stage, the limit of gas production is less than 110 m3 / t (TOC), which is less than 20% of the total hydrocarbon generation.Gas production from natural gas in the same evolution stage is only calculated by kerogen mass balance method The value of 1/10 or so.Gold tube closed high temperature and pressure thermal simulation and pyrolysis method obtained between the amount of gas between the two vitrinite reflectance 1.3% after the gas generation limit of 60 ~ 90m3 / t (TOC The amount of gas generated by rock pyrolysis is the minimum potential for gas generation, whereas kerogen quality is the lowest Get angry amount of balance method is its potential to limit angry, angry actual amount should be less than the calculated amount of elemental mass balance method angry limit.