摘要
松辽盆地北部石炭-二叠系镜质体反射率值普遍较高,普遍大于3.0%,不同构造单元石炭-二叠系镜质体反射率值差异较大。松辽盆地深层石炭-二叠系基底镜质体反射率-深度关系曲线分为两种类型,表明松辽盆地深层石炭-二叠系基底有不同的热演化过程。一种是两段型,镜质体反射率-深度曲线在石炭-二叠系顶部不整合面上、下镜质体反射率值发生突变,不整合面之下石炭-二叠系镜质体反射率值及古地温明显高于上覆地层,表明石炭-二叠系最大古地温是在早白垩世登娄库组沉积之前达到的,白垩纪以来沉积地层厚度对石炭-二叠系古地温提高及热演化程度没有影响。另一种为似线型,石炭-二叠系顶部不整合面上、下镜质体反射率值及古地温连续变化,表明石炭-二叠系最大古地温是在晚白垩世—渐新世之前达到的,白垩纪以来沉积的地层厚度对石炭-二叠系古地温及热演化程度的提高有贡献。在综合分析有机质镜质体反射率、包裹体测温、裂变径迹年龄等多种参数的基础上,对松辽盆地基底石炭-二叠系热演化史进行了恢复,并分析了热演化史与油气生成的关系。
Vitrinite reflectance of the Permo-Carboniferous in the north of Songliao Basin is generally high,usually more than 3.0%,and varies greatly in different tectonic units.The curve of vitrinite reflectance（Ro）-depth（H）of the Permo-Carboniferous basement in Songliao Basin has two types,which means that they have different thermal history.One is a two-section type.Vitrinite reflectance values change abruptly across the unconformity on top of the Permo-Carboniferous.The Ro values and paleotemperature of the Permo-Carboniferous strata under the unconformity are obviously higher than that of the overlying strata,indicating that the maximum paleotemperature of Permo-Carboniferous strata had been reached before the deposition of the Early Cretaceous Denglouku Formation.The sedimentary strata deposited since the Cretaceous have no influences on the improvement of the Permo-Carboniferous paleotemperature and thermal maturity.The other is a pseudo-linear type.The Ro values and paleotemperature vary successively across the unconformity on top of the Permo-Carboniferous strata,which shows that maximum paleotemperature of the Permo-Carboniferous strata had been reached betwen the Late Cretaceous and Oligocene.The sedimentary strata since the Cretaceous contribute to the improvement of Permo-Carboniferous paleotemperature and thermal maturity.Based on comprehensive analysis on vitrinite reflectance,fluid inclusion,fission-track age and so on,paleotemperature and thermal history of Songliao Basin is restored,and the relation between basin thermal history and hydrocarbon generation is analyzed.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2011年第3期430-439,共10页
Oil & Gas Geology
基金
高等学校全国优秀博士学位论文作者专项资金资助项目(200347)
关键词
裂变径迹
古地温
构造-热事件
热演化史
石炭-二叠系
松辽盆地
fission-track
paleotemperature
tectonic-thermal event
thermal history
Permo-Carboniferous
Song-liao Basin
