天然气地球化学

半开放体系下温压对烃源岩HTHP模拟产物产率的影响

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  • 1.甘肃省油气资源研究重点实验室(中国科学院地质与地球物理研究所兰州油气资源研究中心);中国科学院油气资源研究重点实验室,甘肃 兰州 730000;2.中国科学院大学,北京 100049
孙丽娜(1989-),女,吉林长春人,博士研究生,主要从事石油与天然气地球化学研究. E-mail:slina1029@163.com.

收稿日期: 2014-03-04

  修回日期: 2014-05-12

  网络出版日期: 2015-01-10

基金资助

国家科技重大专项项目“深层烃源岩凝析油的排出与残留特征及定量化模拟研究”(编号:2011ZX05008-002-23)资助.

Effect of Temperature and Pressure on Hydrocarbon Yield of Source Rock HTHP Simulation Experiment in Semi-open System

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  • 1.Key Laboratory of Petroleum Resources Research,Gansu Province,Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences;Lanzhou 730000,China;2.University of Chinese Academy of Sciences,Beijing 100049,China
     

Received date: 2014-03-04

  Revised date: 2014-05-12

  Online published: 2015-01-10

摘要

为探究温度和压力对烃源岩高温高压热模拟产物产率的影响,利用WYNN-3型高温高压(HTHP)模拟仪对辽河盆地桃10井Ⅲ型有机质的炭质泥岩进行了半开放体系的生烃、排烃热模拟实验。通过进行温控系列(T—t)和温压共控系列(P—T—t)2种方式350℃、400℃、450℃、500℃、520℃和540℃ 6个温度点的慢速升温热模拟实验。结果发现生烃模拟产物分别在T—t和P—T—t系列的500℃和450℃出现单位样品产率的低点。而分别在2个系列的520℃和500℃出现了模拟气态烃(39.452mg/g和27.697mg/g)和总烃产物产率(51.784mg/g和52.395mg/g)的最大值|并且此温度阶段之后,2种模拟方式实验样品单位产率出现降低趋势。从2个系列排出油、气态烃、总油、总烃单位样品产率和生排烃演化模式的对比中可以发现,压力对Ⅲ型有机质烃产物的生成起到一定的促进作用。同时,实验结果展示的有机质演化过程与传统沉积质演化与油气生成模式有一定的重复性和相似性,一方面展示了实验的可行性与重要性,另一方面也表征了烃源岩在实际地质演化过程中可能出现的复杂的演变特征。为研究评价盆地或凹陷烃源岩的生烃潜力提供了一定的理论指导意义。

本文引用格式

孙丽娜,张中宁,吴远东,苏龙,夏燕青,高占东,郑有伟,王自翔 . 半开放体系下温压对烃源岩HTHP模拟产物产率的影响[J]. 天然气地球科学, 2015 , 26(1) : 118 -127 . DOI: 10.11764/j.issn.1672-1926.2015.01.0118

Abstract

Simulation of source rock for hydrocarbon generation and expulsion in a semi-open system has been carried out on the Type Ⅲ carbonaceous mudstone from Tao 10 Well in the Liaohe Basin.The procedure of slow heating thermal simulation experiments was carried out by the way of temperature-time control(T-t) and pressure-temperature-time control(P-T-t),which all included six temperature points:350℃,400℃,450℃,500℃,520℃ and 540℃ to explore how temperature and pressure affected the rate of pyrolytic products.The result showed that the lowest products appear at 500℃ and 450℃,respectively in T-t and P-T-t series.The maximum gaseous hydrocarbon products appeared at 520℃(T-t,39.452mg/g) and 500℃(P-T-t,27.697mg/g).At the same temperatures,the total hydrocarbon production rate also reaches the peak points,which respectively were 51.788 and 52.057mg/g.After this thermostage,the hydrocarbon yields all had the tendency of reduction.The comparison of expelled oil,residual oil,total oil and total hydrocarbon indicated that pressure promoted the generation of hydrocarbon of type Ⅲ kerogens.As the pyrolysis products evolution had the same evolution with traditional sedimentary organic matter,so a relatively accurate experiment has been done and it placed an important part in the understanding of actual geological process,which also provide theoretical guidance for the study of hydrocarbon potential of basins or hollows.

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