摘要
通过对塔里木盆地古生界地层的沉积岩石学、有机地球化学、有机岩石学以及测井地质学等的综合研究，发现在满加尔凹陷南北斜坡带及柯坪露头区发育的中上奥陶统泥灰岩、泥页岩具有有机质丰度高（ＴＯＣ ０．５％～５．５４％）、有机成熟度适中（ＶＲＥ０.８％～１．３％）的特点，且具有一定的厚度分布。这套源岩的发育主要受上升洋流引起的高有机生产力带的控制，其生烃母质的构成具有浮游和底栖植物双重性。根据三芳甲藻甾烷和２４－降胆甾烷等具有特殊生源和时代意义的生物标志物的油－岩对比分析和生烃史分析结果，证实目前在台盆区发现的工业性油流主要来源于这套地层。
By comprehensive study in sedimentary geology, organic geochemistry, seismic and logging geology, a set of potential mid- upper Ordovician source layers with 80~300m thick have been recognized. The source layers characterized by rich organic car- bon (TOC 0.5%~5.54%) and moderate organic maturity(equivalent vitrinite reflectance 0.8%-1.3%) are mainly composed of argillaceous limestone, marl and shale which developed in the platform edge slope tim-mud mounds in the northern-southern slopes of the Manjiar sag and the restricted gulf facies in the Await sag, respectively. The distribution of these source rocks was obviously controlled by high organic productivity zone caused by upwelling. Age-and environment-related biomarkers were com- bined basin modeling data to verify that the currently found commercial oil mainly originates from this set of source layer.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2000年第6期23-28,共6页
Acta Petrolei Sinica
基金
国家"九五"重点科技攻关项目!(96-111)
Stanford China Industrial Affiliates
Stanford Molecular Organic Geochemistr
关键词
中上奥陶统
油源层
地球化学
塔里木盆地
油源层
middle-upper Ordovician
platform edge slope lim-mud mounts
restricted gulf facies
oil-source correlation
Age- and environment-related biomarkers
hydrocarbon-generating history
upwelling
Tarim Basin
