摘要
利用扫描电镜—能谱元素分析和全岩X-衍射等分析技术对海相页岩优质烃源岩进行超显微有机岩石学研究。海相优质页岩常以石英和钙质矿物(方解石)为主,粘土矿物含量一般不超过20%,平均只在5%左右,总有机碳含量与石英含量具有一定程度的正相关性,而与粘土矿物含量呈负相关。四川盆地东北部上二叠统台地凹陷优质页岩矿物成分以硅质和钙质矿物为主,几乎不含粘土,硅质矿物或钙质矿物多为各种成烃生物的碎屑或生物粘吸物经成岩作用演化而来,为有机成因。超显微硅质生物遗骸颗粒内一般含有机成因的碳元素和硫元素,且二者含量具有正相关性。台内凹陷沉积环境容易形成富有机质、高硅质钙质矿物而低粘土的海相优质页岩。
The characteristics of ultramicroscopic organic lithology of excellent marine shale were investigated by means of whole rock X-ray diffraction and Scanning Electron Microscopy（SEM） equipped with Energy Dispersive Spectrometer（EDS）.Excellent marine shales consisted mainly of quartz and calcareous mineral（calcite）,the content of clay minerals such as illite and montmorillonite was commonly lower than 20% and the average was only about 5%.The total organic carbon content（TOC） had a positive correlation with the quartz content but a negative correlation with clay minerals content.Excellent marine shales in the Upper Permian sequence of inner-platform sag in northeastern Sichuan Basin chiefly composed of silicesous mineral（quartz） and calcareous mineral,but contained almost no clay.The siliceous minerals and calcareous minerals in excellent marine shale were organic origin because that they were developed originally from the siliceous bioclastic of hydrocarbon generation orga-nism experienced diagenesis.Almost ultramicroscopic particles of the siliceous bioclastic contained orga-nic carbon and sulfur,and there were a positive correlation between the contents of carbon and sulfur.Inner platform sag sedimentary environment was favorable for deposition of shale with high TOC and silices mineral but low clay contents.
出处
《石油实验地质》
CAS
CSCD
北大核心
2010年第2期164-170,共7页
Petroleum Geology & Experiment
基金
国家重点基础研究发展计划(973计划)项目(2005CB422102)资助
关键词
超显微有机岩石学
硅质生屑
海相页岩
上二叠统
台内凹陷
四川盆地
ultramicroscopic organic lithology
siliceous bioclastic
excellent marine shale
inner platform sag
Sichuan Basin
