摘要
安然构造生物礁中的沥青,分布于礁岩成岩期后的各类孔隙中,具有格架溶蚀孔洞沥青、裂缝型沥青和裂缝——晶洞混合型沥青三种产状。沥青的显微结构为:中间相球粒、融并的中间相球体,具镶嵌、棒状和片状结构。经沥青的元素分析、X衍射,反射率测定、微量元素和芳烃分析,表明安然生物礁中的沥青具有机质过成熟的特征。通过沥青的油源分析,初步证实安然二叠系茅口组的科—1沥青的油源来自下伏中泥盆统生油岩;上二叠统长兴组的Md—1裂缝沥青的油源来自上覆中三叠的生油岩;有一部分沥青显示了混源特征。
The bitumen in Anran reefs which distributes in different pores consists of framework dissolution pore-cave filling type, fissure filling type and fissuredruse filling type. Its microtexure is of intermediate phase pellets, welded pellets with mosaic texture, stick-like and slice-like texture. By chemical analysis,X-ray eiffraction and reflectance determination, trace element analysis, as well as aromatic hydrocarbon analysis, it is revealed that the bitumen in Anran reefs is characserized by overmature organic matter. By oil source reseach it is preliminarily confirmed that the oil source of Ke-1 bitumen in Maokou formation of Lower Permian is from underlying Middle Devonian source rock,the Md-1 fissure filling bitumen in Changxin formation of Upper Permian comes from the overlying Middle Triassic source rock, and some bitumen is characterized by mixed sources.
出处
《西南石油学院学报》
CSCD
1991年第4期21-30,共10页
Journal of Southwest Petroleum Institute
关键词
生物礁
沥青
油源对比
芳香烃
Reef
Bitumen
Intermediate phase change
Microtexture
Thermal evolution
Aromatic hydrocarbon
Component analysis
Oil source correlation
