羌塘盆地中生代源岩中动物型原沥青的成因及意义  

Origin and Significance of Zo-bitumens in Mesozoic Source Rocks in the Qiangtang Basin

作　　者：王延斌[1] 毕建军[1] 赵厚银[1] 苏爱国[2] 杜美利[3] 

机构地区：[1]中国矿业大学北京校区资源开发工程系,100083 [2]石油勘探开发研究院地质研究所,北京100083 [3]西安科技学院材料系,710054

出　　处：《地质论评》2001年第4期393-397,共5页Geological Review

基　　金：中国石油天然气集团公司"九五"科技攻关项目;国家自然科学基金(编号49972054)

摘　　要：通过对羌塘盆地中生代碳酸盐岩中广泛存在的环状、串珠状动物型原沥青进行显微傅立叶红外、热模拟及光性变化特征的研究,结果发现:动物型原沥青形成于有孔虫的壳壁(外皮),在不同温度的热模拟实验中,其光性变化与镜质组具有明显的相关性,与沥青的热演化特征基本相似,因此,其反射率(R_b)可作为青藏高原中生代碳酸盐岩源岩成熟度评价的基础。The Qiangtang basin is a large Meso - Cenozoic basin on the Qinghai-Xizang Plateau, which is a vast hydrocarbon-bearing region. Researches on oil and gas generation of Mesozoic marine source rocks have been done on the basis of a large volume of data of source rocks in the Qinghai -Xizang Plateau. According to the results of studies of the Carbonate rocksin the Qiangtang basin, zo-bitumens, which are annular or in the shape of a string of beads, are generated from foraminifers occurring in the marine source rocks. It has been shown by Micro FT-IR and simulation experiment that there is an obvious correlation between Rb of zo-bitumens and R0 of vitrinite, the former being lower than the latter when R0<0. 9%. Based on analysis of the relationship between Rb and R0, the expression R0 = 0. 6704Rb + 0. 2095 has been set up, and the correlative coefficient r2 is 0. 9653, which provides an important parameter for accurately determining the organic maturity of the Mesozoic marine source rocks on the Qinghai-Xizang Plateau.

关 键 词：青藏高原 羌塘盆地 成熟度 动物型原沥青 中生代 源岩 成因 沉积盆地 

分 类 号：P544.4[天文地球—构造地质学]