油页岩生排烃模拟实验中不同液态烃产物特征  

Features of liquid hydrocarbon in different states in oil shale during hydrous pyrolysis

作　　者：孙丽娜[1] 张明峰 吴陈君[2,3] 王自翔 妥进才[2,3] 

机构地区：[1]非常规油气湖北省协同创新中心(长江大学),武汉430100 [2]甘肃省油气资源研究重点实验室,兰州730000 [3]中国科学院油气资源研究重点实验室,兰州730000 [4]中国石化江汉油田分公司勘探开发研究院,武汉430223

出　　处：《岩性油气藏》2017年第6期23-31,共9页Lithologic Reservoirs

基　　金：国家重点基础研究发展计划"致密油(页岩油)储集空间定量表征"(编号:2014CB239004);长江大学青年科研支持计划基金"中扬子地区海相页岩吸附气量定量评价体系研究"(编号:7013302105)联合资助

摘　　要：为了探究油页岩生排烃模拟实验中不同液态烃产物的组成及变化特征,利用WYMN-3型高温高压模拟仪分别对鄂尔多斯盆地延长组长7油层组和准噶尔盆地芦草沟组油页岩样品在250℃,300℃,350℃,375℃,400℃,450℃和500℃共7个温度条件下进行了半开放体系生排烃模拟实验。通过对比与分析排出油、洗出油和残留油等3种液态烃产物的生成特征及族组分组成,结果发现:2个样品中排出油均是影响总油变化的重要因素,均随温度呈基本不变→升高至最大值→下降的3段式变化趋势;洗出油和残留油的变化趋势相同,均表现为基本不变→升高至最大值再下降至最低值→基本不变的变化趋势。从3种液态烃产率的变化趋势可以明显地将有机质热演化划分为可溶有机质生油气、干酪根热裂解生油气和油裂解生气等3个阶段。就排出油、洗出油和残留油的关系而言:洗出油为排出油和残留油的"过渡"产物;排出油产率峰值对应的温度高于洗出油峰值对应的温度,残留油产率峰值对应的温度一直为350℃,所以排出油经过初次运移后会在烃源岩表面滞留一段时间后再发生二次运移,而残留油峰值则出现在"生油窗"初期阶段的温度点上。微观上,排出油和残留油族组分中,高含量的饱和烃、芳烃组分是总有机碳含量更高的重要依据,也是生烃产率更高的重要影响因素。由此可见,通过研究排出油、洗出油和残留油的产率和族组分特征,可为进一步探讨地质演化过程中液态烃的演化阶段和状态提供理论依据。In order to understand the components and change features of liquid hydrocarbons in different states,a series of simulation experiments were conducted on source rocks using WYMN-3 high temperature and pressure simulator. These pyrolysis experiments were conducted on the columned oil-shales samples from YanchangFormation in Ordos Basin and Lucaogou Formation in Junggar Basin under semi-open system,and the temperatures were set on 250 ℃,300 ℃,350 ℃,375 ℃,400 ℃,450 ℃ and 500 ℃. The hydrodynamic pressures were all carried on 50 MPa,and the experiments were all kept on the target temperatures for 48 hours. The liquid hydrocarbons products were separated into expelled oil,wash-out oil and residual oil,and the sum of the three components was defined as total oil. Based on the analysis about the features of expelled,wash-out,residual and total oil,what we have found were listed as below：（1）with the temperature increasing,the tendency of expelled oil and total oil is the same,which shows the importance of expelled oil for the yields of total oil;（2）the trend of wash-out and residual oils with different temperatures is the same,which could be related to the evolution of organic matters;（3）from the changing stages of expelled,wash-out and residual oils,the three thermal evolution stages are the thermal cracking of soluble organic matter in original source rocks,the thermal cracking of kerogens,and the second cracking of oil to gases;（4）the stages of expelled oil are always later than washout oil,which indicates that the expelled oil would be retained on the surface of source rocks before the second migration;（5）the maximum yields of residual oil are occurred at 350 ℃ in both samples,thus the beginning of oil generation window is the maximum point of residual oil;（6）the higher total organic carbon content may be resulted in the higher generation of hydrocarbons during thermal evolution,and the higher contents of saturated hydrocarbons and aromatic hydrocarbons could be also resulted

关 键 词：加水热解 排出油 洗出油 残留油 总液态烃 族组成 

分 类 号：TE122.113[石油与天然气工程—油气勘探]