摘要
辽河盆地大民屯凹陷厚层暗色富有机质泥页岩的沉积特征研究和地球化学数据分析结果表明,大民屯古近系凹陷古近系沙河街组发育湖泊和扇三角洲沉积。在扇三角洲中的沼泽地带,发育富有机质的碳质泥岩。暗色泥岩主要产生于半深湖-深湖环境中,具有厚度大、连续性强、分布广的特点。泥岩中的干酪根类型主要以腐泥腐殖质型（II2）和腐殖型（III）为主,利于产气。有机质成熟度（Ro）平均为0.8%~1.3%,有机质处于低熟-成熟阶段。TOC平均为3%~8.46%,有机质丰度较高。脆性矿物总量达到29.0%~51.7%,有利于页岩气的开采。页岩气类型主要为热成因页岩气和生物化学成因页岩气。在页岩气成藏的地质因素分析基础上,综合研究认为,荣胜堡洼陷和三台子洼陷是沙河街组页岩气富集的有利区域。
The results of the research of sedimentary geochemical characteristics and geochemical data of thick layer of dark and organic-rich shale show that lacustrine,fan dalta facies are present in the Paleogene Shahejie Formation. The dark mudstone mainly deposited in deep to semi-deep lacustrine environments with the characteristics of large thickness,good continuity and wide distribution. The types of kerogen in mudstone are mainly II2 and III,which is advantageous to the gas generation. The maturity of organics（ Ro） is 0. 8% ~ 1. 3%,which is in lowmature to mature situation. The TOC is 3% ~ 8. 46%,with high abundance of organic matter. Contents of brittle minerals is 29. 0% ~ 51. 7%,which is the advantage of exploitation of shale gas. The shale gas is mainly biogenic and hydrothermal origin in type. Combined with the achievement in research area,comprehensive analysis of the factors of geological factors of shale gas accumulation suggests that the Rongshengbao depression and the Santaizi depression serve as the favorable area for the shale gas exploration in the Damintun depression.
出处
《世界地质》
CAS
2016年第1期197-206,共10页
World Geology
基金
中国地质调查项目(12120114065901-01)
国家自然科学基金项目(41472173
40902057
40702027)
国土资源部公益性行业科研专项经费项目(201311111)联合资助
关键词
辽河盆地
大民屯凹陷
古近系
沙河街组
页岩气
有机质类型
成藏条件
Liaohe Basin
Damintun depreesion
Palaeogene
Shahejie Formation
shale gas
type of kerogen
reservoir forming conditions
作者简介
通讯作者：方石（1974-），男，副教授，主要从事沉积学、油气勘探和低温热年代学等方面的研究．E-mail：fangshi@jlu．edu．cn
