摘要
在分析多种有机质赋存形式的基础上,探讨了塔里木盆地下古生界和南华北石炭系碳酸盐岩的各种有机质含量关系及其成烃演化特征。研究发现,一般操作条件下所得的沥青 A 和沥青 C 并非真正意义的吸附有机质和包裹有机质。目前还无法将真正的包裹有机质从碳酸盐岩中分离出来。由于成熟度、排烃条件等的影响,碳酸盐岩中各种有机质含量的相关关系不明显,仅沥青 A 和沥青 C 有比较差的正相关关系。含Ⅰ—Ⅱ_1型有机质的碳酸盐岩(塔里木盆地下古生界可溶有机质转化率高,含Ⅱ_2—Ⅲ型有机质碳酸盐岩(南华北地区石炭系)的转化率比较低;二者的转化率高峰对应的 R_o 分别位于1.25%附近和1.00%附近;生油窗下限分别在 R_o=1.80%～1.90%和R_o=1.70%～1.80%;其有机母质的生油窗范围,后者宽于前者。不同类型碳酸盐岩成烃特征的差异主要取决于有机母质类型。
Based on analysis of various forms of organic occurrence,the paper discusses various organic content and hydrocarbon-gen- erating characteristics of carbonate rock of Lower Paleozoic in Tarim Basin and of Carboniferous in the southern part of North China.It is discovered that both bitumen“A”and bitumen“C” got by normal operation are not the real adsorbed organic and inclosed organic.At present there is no way to separate the real inclosed organic from carbonate rock.Because of different maturity and hydrocarbon expulsion,the correlation of every organic content in carbonate rock is not very clear,only bitu- men“A”has a poor positive bearing on bitumen“C”.Type Ⅰ -Ⅱ_1 organic occurred in lower Paleozoic carbonate rock of Tarim Basin has a high soluble organic transform rate while Type Ⅱ_2-Ⅲ organic occurred in Carboniferous carbonate rock of the southern part of North China has a lower transform rate.The transform rate peaks are corresponding to R_o≈ 1.25% and R_o≈1.0%,and corresponding lower limits of oil windows are R_o≈1.80%～1.90% and R_o=1.70%～1.80% respectively.For oil window limits,the latter is wider than the former.The difference of hydrocarbon-generating characteris- tics among various types of carbonate rocks depends on the types of kerogen.
出处
《海相油气地质》
1997年第2期45-48,共4页
Marine Origin Petroleum Geology
关键词
碳酸盐岩
烃源岩
有机质类型
赋存形式
油气藏
Carbonate rock
Source rock
Bitumen analysis
Types of organic
Oil-gas evolution
Model
