摘要
南华北地区晚古生代沉积了一套台地相-海陆过渡相-内陆湖相地层,上古生界烃源岩主要为一套连续沉积的含煤岩系。利用有机地化分析测试资料,结合上古生界沉积背景与沉积相,从纵向和平面上研究了该区上古生界煤系烃源岩的有机质丰度、类型及热演化等地球化学特征,确定太原组、山西组煤系泥岩、煤岩为上古生界含油气系统的主力烃源岩。探讨了上古生界烃源岩的二次生烃条件及主控因素,认为二次生烃时烃源岩生烃潜量越大越好,初始成熟度越低越好,地温梯度越高越好;其主控因素为生烃潜量和温度。最后指出二次生烃范围主要分布于谭庄—沈丘、倪丘集、鹿邑和襄城等凹陷。
In the Southern North China region, a series of the Late Paleozoic formation with platform facies, transitional facies and inland lake facies had been deposited. The Upper Paleozoic source rocks mostly represent a set of successive coal--bearing squence. Combined with study of the Upper Paleozoic sedimentary settings and sedimentary facies, by using analyzed and tested geochemical data, the geo- chemical characteristics of organic matter abundance, type and thermal evolution of source rocks in coal bearing strata was studied. The resuhs confirmed that the main Upper Paleozoic source rocks were contained in the coal measure mudstone end coal--bearing rock in Taiyuan Formation and Shanxi Forma- tion. Besides that, the condition of secondary oil generation and main controlling factors （the potentiality and temperatures） of the Upper Paleozoic source rocks was considered and it was proved that the better source rocks showed greater potential, lower initial maturity and higher geothermal gradient. In the end, it was pointed out that the secondary oil generating areas were mainly in Depressions of Tanzhuang-- Shenqiu , Niqiuji, Luyi , Xiangcheng.
出处
《石油实验地质》
CAS
CSCD
北大核心
2008年第5期484-488,共5页
Petroleum Geology & Experiment
关键词
二次生烃
有机地球化学
烃源岩
上古生界
南华北地区
secondary hydrocarbon generation
geochemistry
source rocks
Upper Paleozoic
theSouthern North China
