建昌盆地五家子地区下白垩统九佛堂组油页岩有机质富集条件及机制  

Organic matter enrichment conditions and mechanism of oil shale in Lower Cretaceous Jiufotang Formation of Wujiazi area in Jianchang Basin

作　　者：于浩 张朋霖 孙平昌[1,2] 刘招君 王涛[1,2] YU Hao;ZHANG Penglin;SUN Pingchang;LIU Zhaojun;WANG Tao(College of Earth Sciences,Jilin University,Changchun 130061,China;Jilin Provincial Key Laboratory of Oil Shale and Paragenetic Energy Minerals,Changchun 130061,China)

机构地区：[1]吉林大学地球科学学院,吉林长春130061 [2]吉林省油页岩与共生能源矿产重点实验室,吉林长春130061

出　　处：《大庆石油地质与开发》2023年第5期36-46,共11页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家自然资源部油气资源战略研究中心“十三五”项目“全国油气资源评价项目”子课题“全国油页岩资源评价”(2017YQZYPJ0131)。

摘　　要：建昌盆地五家子地区下白垩统九佛堂组存在丰富的优质油页岩资源,但现阶段对该地区油页岩富集规律的研究较少,在一定程度上阻碍了该地区的成矿预测和油页岩开发。通过镜下观察、X衍射、地球化学分析、岩石热解等方法,研究了建昌盆地五家子地区下白垩统九佛堂组的有机质富集规律。结果表明:研究区九佛堂组油页岩可依据w (TOC)等于8%为界划分为A段(上部)与B段(下部),A段生烃潜量(S_(1)+S_(2)平均77.12 mg/g)优于B段生烃潜量(S_(1)+S_(2)平均29.44 mg/g);古气候对有机质富集的影响最大,然后依次为古生产力、氧化还原条件、古盐度;建立了研究区咸水缺氧型和半咸水贫氧型2种有机质富集模式。研究结果可对油页岩勘探过程中有利区优选及资源潜力评价提供理论基础。The abundant high-quality oil shale resources exist in Lower Cretaceous Jiufotang Formation of Wujiazi area in Jianchang Basin.However,at present,few researches on enrichment laws of oil shale in this area hinder the metallogenic prediction and oil shale development in this area.The organic matter enrichment laws of Lower Creta-ceous Jiufotang Formation in Wujiazi area are studied by means of microscopic observation,X-ray diffraction,geo-chemical analysis and rock pyrolysis methods.The results show that the oil shale of Jiufotang Formation in studied area is divided into Member A(upper)and Member B(lower)according to w(TOC)content(8%as the bound-ary).The hydrocarbon generation potential of Member A(average S_(1)+S_(2) of 77.12 mg/g)is better than that of Mem-ber B(average S_(1)+S_(2) of 29.44 mg/g).Paleoclimate has the most influence on organic matter enrichment,followed by paleoproductivity,REDOX conditions and paleosalinity.2 organic matter enrichment models of brackish-water anoxic model and semibrackish-water dysoxic model are established for studied area.The research results provide theoretical basis for favorable areas optimization and resource potential evaluation in the oil shale exploration process.

关 键 词：油页岩 有机质富集 古气候 建昌盆地 九佛堂组 

分 类 号：TE122[石油与天然气工程—油气勘探]