摘要
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_1型与Ⅱ_2型有机质生油窗对应R_O值介于0.6%~1.3%之间,并且R_O值均在0.9%左右达到生油最大值,分别为580mg/g_(TOC)、350mg/g_(TOC)和260mg/g_(TOC)左右,但是3类有机质生油耗尽时对应R_O值依次减小;以R_O=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_1型和Ⅱ_2型,超过100mL/g_(TOC),而Ⅱ_1型和Ⅱ_2型有机质初次裂解气量相近,约为70~80mL/g_(TOC),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_1型与Ⅱ_2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。
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,TypeⅡ_1 and TypeⅡ_2.Their oil window is basically coincident and %R_O is correspondingly at 0.6%-1.3%,while%R_O at 0.9%,oil yields reaching the peak value,about 580,350 and 260 mg/g_（TOC） respectively for TypeⅠ,TypeⅡ_1 and TypeⅡ_2.But the corresponding%R_O value of TypeⅠ,TypeⅡ_1 and TypeⅡ_2 decreases when oil-generating potential is exhausted.There is two stages of gas-generating,gas from kerogen cracking at%R_O below 1.3% and oil cracking at%R_O exceeding 1.3% respectively.The gas yield from kerogen cracking of Type Ⅰis exceeding 100 mL/g_（TOC）,higher than the similar yields of TypeⅡ_1 and Type Ⅱ_2,about 70-80 mL/g_（TOC）.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.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2018年第1期103-113,共11页
Natural Gas Geoscience
基金
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
关键词
热模拟实验
热演化生烃
湖相烃源岩
冀中坳陷
Pyrolysis experiment
Thermogenic hydrocarbon-generating
Lacustrine source rocks
JizhongDepression
作者简介
陈晓艳（1989-），女，陕西山阳人，博士研究生，主要从事油气藏形成与分布、油气地球化学研究．E-mail：chenxiaoyan180401@163．com．;通信作者：邹华耀（1963），男，江西上高人，教授，博士，主要从事油气成藏机理教学与科研工作．E-mail：huayaozou@cup．edu．cn．
