摘要
对于因油、沥青或其他可溶有机质的侵入而导致Tmax值降低的烃源岩，只要改变岩石热解分析S2峰的热解分析条件，提高其起始分析温度，便可去除有机污染物对热解烃S2峰的干扰，恢复其Tmax原值。通过实验研究了不同S2起始分析温度对未熟烃源岩Tmax值、高成熟烃源岩Tmax值及非烃进入S2峰相对量的影响，及氯仿沥青“A”、原油、泥浆有机添加剂的侵入对烃源岩Tmax值的影响。在此基础上提出，改变S2峰的热解分析条件，以380～600℃温度范围分析S2峰，可还原Tmax真值。应用该方法对受重质可溶有机质严重污染的烃源岩Tmax值进行了还原，还原结果与该岩样的镜质体反射率吻合，证实了其可靠性。
The Tmax values will be abnormally low when the source rocks are contaminated by soluble organic matters, such as oil, bitumen and the like. These organic contaminants can be removed by increasing the initial S2 pyrolysis temperature, and the normal values of Tmax can be got. Different initial S2 pyrolysis temperatures have been tested on both high maturity source rocks and low maturity source rocks, in which different organic matters such as non-hydrocarbon, chloroform extract, crude oil or additive in drilling fluids are contained. On the basis of the test results, it is proposed that the normal Tmax values could be recovered at the S2 pyrolysis temperature range of 380-600℃. A heavily contaminated source rock has been recovered by this method, the Tmax has best correlation with Ro of cuttings in well BXX.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2007年第5期580-584,共5页
Petroleum Exploration and Development
基金
中国石油天然气股份有限公司科技攻关项目"油气地质实验技术方法研究"(090010020)
关键词
烃源岩
热解
Tmax
异常值
还原
原值
source rock
Rock-Eval
Tmax abnormal value
recovery
original value
