摘要
吐哈盆地产出有比较丰富的侏罗系煤成油气田，本文用共聚焦激光扫描显微镜和热解分析等手段研究了煤中类脂组及微类脂组的类型、含量、分布与煤成烃性能和产出的关系。观察分析结果表明：在一般煤岩组分观测中主要含煤的西山窑组和八道湾组煤层类脂组含量很少超过１０％，但是一些煤样的热解分析中Ｓ＿１可高达５－２３ｍｇ／ｇ，Ｓ＿２可达１５０─２００ｍｇ／ｇ，ＨＩ（烃／有机碳）可高达１５０─３５０ｍｇ／ｇ生烃、含烃性能较好。进一步用共聚焦激光显微镜观测结果表明：本区一些薄层状、条带状煤层的基质镜质体和叶结构镜质体中微类脂组含量比较丰富，微区定量统计含量在３％─１８％左右。这种富含微类脂组的基质镜质体和结构镜质体在煤成油气中有重要意义，而且由于多数微类脂体在煤中常成点线状、似层状、充填状、网络状分布，可能有利于煤成油气的运移和聚集。
Abundant coal-generated oil and gas have been discovered in Tuha basin, China.This paper investigated the types, contents and distributions of microliptinite in coals and its relationship with the formation and productivity of coal-generated oil and gas. The results show that most of the coal samples have exinite of <10%, but they have S_1 of 5-23mg /g, S_2 of 151-200mg/g and Hydrogen Index of 150-350mg /g in Rock-Eval analysis, and demonstrated its good potential for hydrocarbon generation. The CLSM observation indicated that they were rich in microliptinites, with a content of 3%-18% according to the microarea quantity method, in desmocollinite and leafcorpocollinite in some lamellar and banded coal samples. This may be one of the reasons for the high values of S_1+S_2 in these coal samples.It suggested that the desmocollinites had made an significant contribution to hydrocarbon generation. Meanwhile, because the distributions of microliptinites in coals exist as point-line,bed like filling and network shape, they facilitate the migration and accumulation of coalgenerated oil and gas.
出处
《地球化学》
CSCD
北大核心
1996年第4期309-316,T002,共8页
Geochimica
关键词
微类脂体
扫描显微镜
煤系
油气田
成因
microliptinite
desmocollinite
coal-generating
hydrocarbon
confocal laser scanning microscope(CLSM)
