收稿日期: 2017-08-20
修回日期: 2017-09-30
网络出版日期: 2018-01-10
基金资助
国家自然科学基金项目（编号：U1663210）;国家“十三五”科技重大专项（编号：2016ZX05024-003-008）联合资助.
Study on hydrocarbon-generation of lacustrine source rocks based on hydrous pyrolysis experiments of source rocks from Jizhong Depression，Bohai Bay Basin
Received date: 2017-08-20
Revised date: 2017-09-30
Online published: 2018-01-10
基于烃源岩热演化生烃原理，利用实验室加水热模拟生烃实验，结合GC分析，通过对来自渤海湾盆地冀中坳陷的8个不同有机质类型的未熟烃源岩样品的生烃热演化定量分析，得到湖相烃源岩的热演化生烃定量模型。湖相Ⅰ型、Ⅱ型与Ⅱ2型有机质生油窗对应RO值介于0.6%~1.3%之间，并且RO值均在0.9%左右达到生油最大值，分别为580mg/gTOC、350mg/gTOC和260mg/gTOC左右，但是3类有机质生油耗尽时对应RO值依次减小；以RO=1.3%为界，分为初次裂解气与二次裂解气2个阶段，其中Ⅰ型有机质初次裂解气量显著高于Ⅱ型和Ⅱ2型，超过100mL/gTOC，而Ⅱ型和Ⅱ2型有机质初次裂解气量相近，约为70~80mL/gTOC，二次裂解生气量受控于烃源岩的排油效率；湖相Ⅰ型有机质生油与生气潜力均远高于Ⅱ型与Ⅱ2型，在具备良好的成藏保存条件下，分别以3类有机质为主的湖相烃源岩初次裂解生气量均具有形成工业性气藏的能力。
陈晓艳，田福清,邹华耀，郭柳汐,芦晓伟，殷杰，王道军 . 湖相烃源岩热演化生烃研究——基于冀中坳陷烃源岩加水热模拟实验[J]. 天然气地球科学, 2018 , 29(1) : 103 -113 . DOI: 10.11764/j.issn.1672-1926.2017.11.010
Based on hydrocarbon generation from source rocks with increasing thermal maturity，quantitative models for hydrocarbon generation of lacustrine source rocks are concluded by hydrous gold-tube pyrolysis experiments and GC analysis of eight immature samples from different types of organic matters in Jizhong Depression，Bohai Bay Basin.The types of organic matters (OM) from lacustrine source rocks mainly contain TypeⅠ，Type Ⅱ1 and Type Ⅱ2.Their oil window is basically coincident and %RO is correspondingly at 0.6%-1.3%，while %RO at 0.9%，oil yields reaching the peak value，about 580，350 and 260mg/gTOC respectively for TypeⅠ，Type Ⅱ1 and Type Ⅱ2.But the corresponding %RO value of Type Ⅰ，Type Ⅱ1 and Type Ⅱ2 decreases when oil-generating potential is exhausted.There is two stages of gas-generating，gas from kerogen cracking at %RO below 1.3% and oil cracking at %RO exceeding 1.3% respectively.The gas yield from kerogen cracking of Type Ⅰ is exceeding 100mL/gTOC，higher than the similar yields of Type Ⅱ1 and Type Ⅱ2，about 70-80mL/gTOC.However，it is difficult to quantitatively research the yield of gas from oil cracking，which is controlled by oil expulsion efficiency.The yields of three OM types from lacustrine source rocks are enough to form industrial gas fields when the conditions of accumulation and preservation are allowed.
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