鄂尔多斯盆地甘泉地区上古生界烃源岩地球化学特征及生烃潜力  

Geochemical characteristics and hydrocarbon generation potential of Upper Paleozoic source rocks in Ganquan area,Ordos Basin

作　　者：魏新 唐建云[1,2,3,4] 宋红霞 陈玉宝 WEI Xin;TANG Jianyun;SONG Hongxia;CHEN Yubao(Karamay Vocational and Technical College,Karamay 834000,Xinjiang,China;China University of Petroleum(Beijing)at Karamay,Karamay 834000,Xinjiang,China;Department of Geology/State Key Laboratory of Continental Dynamics,Northwest University,Xi’an 710069,China;Jiangxi Engineering Laboratory on Radioactive Geoscience and Big Data Technology,Nanchang 330013,China;Research Institute of Exploration and Development,PetroChina Tuha Oilfield Company,Hami 839009,Xinjiang,China;Yanchang Petroleum Co.,Ltd.,Yan’an 716005,Shaanxi,China)

机构地区：[1]克拉玛依职业技术学院,新疆克拉玛依834000 [2]中国石油大学(北京)克拉玛依校区,新疆克拉玛依834000 [3]西北大学地质学系/大陆动力学国家重点实验室,西安710069 [4]江西省放射性地学大数据技术工程实验室,南昌330013 [5]中国石油吐哈油田分公司勘探开发研究院,新疆哈密839009 [6]延长油田股份有限公司,陕西延安716005

出　　处：《岩性油气藏》2022年第6期92-100,共9页Lithologic Reservoirs

基　　金：新疆维吾尔自治区自然科学基金“吉木萨尔致密油渗流机理特征及开发方式基础实验研究”(编号:2017D01B56);大陆动力学国家重点实验室开放基金“准噶尔盆地周缘石炭系成藏条件及有利区预测”(编号:20LCD04);江西省重点实验室开放基金“基于叠前AVO反演技术的火成岩内幕精细刻画及储层预测”(编号:JELRGBDT202008);中国高校产学研创新基金“基于大数据及人工智能的井位优化及远程踏勘平台”(编号2021LDA06005)联合资助。

摘　　要：对鄂尔多斯盆地甘泉地区上古生界本溪组和山西组的煤系泥岩、炭质泥岩及煤岩样品进行了有机碳含量测定、岩石热解分析、干酪根显微组分鉴定及镜质体反射率等多项有机地球化学测试,并评价了其生烃潜力。研究结果表明:(1)甘泉地区上古生界发育多套烃源岩,岩性主要为煤和暗色泥岩。(2)山西组有机质丰度高,是较好的烃源岩,本溪组有机质丰度则相对较低,品质相对较差;本溪组烃源岩以腐殖型Ⅲ类为主,山西组烃源岩则多为腐殖型Ⅲ类,其次为腐泥-腐殖型Ⅱ2类。(3)本溪组和山西组烃源岩成熟度整体处于高成熟—过成熟阶段。(4)上古生界烃源岩在甘泉地区广泛分布,本溪组烃源岩累计厚度为10~20 m,山西组烃源岩累计厚度为50~80 m,整体均为较优质烃源岩,具有较高的生烃潜力。A number of organic geochemical tests such as organic carbon content determination,rock pyrolysis analysis,kerogen maceral identification and vitrinite reflectance,were carried out on coal measure mudstone,carbonaceous mudstone and coal rock samples of Benxi Formation and Shanxi Formation of Upper Paleozoic source rocks in Ganquan area of Ordos Basin,and the hydrocarbon generation potential was evaluated.The results show that:(1)There are many sets of source rocks developed in Upper Paleozoic in Ganquan area,and the lithologies are mainly coal and dark mudstone.(2)The organic matter of Shanxi Formation has high abundance and it is a good source rock.In contrast,the organic matter abundance of Benxi Formation is low and relatively poor.In terms of organic matter types,the source rocks of Benxi Formation are mainly humic typeⅢ,while the source rocks of Shanxi Formation are mostly humic type Ⅲ,followed by sapropel-humic type Ⅱ_(2).(3)The maturity of source rocks of Benxi Formation and Shanxi Formation has been in the stage of high maturity to over maturity.(4)The Upper Paleozoic source rocks are widely distributed in Ganquan area.The cumulative thickness of source rocks of Benxi Formation is 10-20 m,and the cumulative thickness of source rocks of Shanxi Formation ranges from 50 m to 80 m.As a whole,they are relatively high-quality source rocks with high hydrocarbon generation potential.

关 键 词：烃源岩 地球化学特征 生烃潜力 山西组 本溪组 上古生界 甘泉地区 鄂尔多斯盆地 

分 类 号：TE122[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]