海拉尔盆地白垩系南屯组致密油勘探突破及意义  

Breakthrough and significance of tight oil exploration in Cretaceous Nantun Formation of Hailaer Basin

作　　者：白雪峰 李军辉[2,3] 陈方举 李跃[2,3] 卢双舫 侯思宇 郑强[2,3] 邹越 田亚 李梦霞 李中坚[2,3] 刘华晔 王彪 Bai Xuefeng;Li Junhui;Chen Fangju;Li Yue;Lu Shuangfang;Hou Siyu;Zheng Qiang;Zou Yue;Tian Ya;Li Mengxia;Li Zhongjian;Liu Huaye;Wang Biao(School of Geosciences,China University of Petroleum(East China),Shandong Qingdao 266580,China;National Key Laboratory for Green Mining of Multi-resource Collaborative Continental Shale Oil,Heilongjiang Daqing 163712,China;Exploration and Development Research Institute,Daqing Oilfield Company Limited,Heilongjiang Daqing 163712,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]多资源协同陆相页岩油绿色开采全国重点实验室,黑龙江大庆163712 [3]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《石油学报》2024年第11期1579-1591,共13页Acta Petrolei Sinica

基　　金：中国石油天然气股份有限公司科技重大专项(2016EG0202);黑龙江省青年科技人才托举工程项目(2022QNTJ009)资助。

摘　　要：海拉尔盆地是位于中国东部的含油气断陷盆地,下白垩统南屯组为其主要生油层和储油层。历经60余年的油气勘探,目前在2大主力富油凹陷(乌尔逊凹陷和贝尔凹陷)构造高部位发育的常规油藏已勘探殆尽,斜坡带和洼槽区广泛发育的致密油藏成为规模增储的重要接替领域。基于烃源岩特征、沉积和储层条件等精细研究,系统认识了乌尔逊—贝尔凹陷南屯组致密油藏的成藏条件和成藏模式。研究结果表明,南屯组烃源岩主要发育在南屯组一段中—下部,伴随湖平面升降,不断深入湖盆中心的扇三角洲前缘沉积、辫状河三角洲前缘沉积以及滑塌形成的湖底扇沉积为致密油藏提供了充足的储油砂体;有效烃源岩与沉积扇体的相互耦合控制着南屯组致密油藏的分布,构造背景与优势砂体决定了南屯组致密油藏的富集;根据源-储配置关系,南屯组致密油藏可进一步划分为源-储一体型和上源下储型2种类型。2023年,油公司率先针对成藏条件更为有利的源-储一体型致密油藏部署了X38-2H井,试油获得23.2 t/d的高产工业油流,证实目前的地质认识和工程技术可以实现海拉尔盆地致密油藏的有效动用。乌尔逊凹陷、贝尔凹陷、红旗凹陷及巴彦呼舒凹陷等8个主力生烃凹陷重新评价的致密油勘探潜力为3.84×10^(8)t。优选贝西次凹和乌南次凹为下一步致密油气的重点勘探区带。Hailaer Basin is an oil-bearing faulted basin in the east of China,where the Lower Cretaceous Nantun Formation is the main oil-generating and oil-bearing strata.After more than 60 years of oil and gas exploration,conventional oil reservoirs developed in the high structural parts of the two main oil-rich depressions,i.e.,Wuerxun and Beier sags,have been completely explored,the widely developed tight oil reservoir in slope zone and trough area will become an important replacement field for increasing reserves on a large scale.In recent years,based on the detailed study of source rock,deposition and reservoir conditions,the researchers have achieved a systematic understanding of the hydrocarbon accumulation conditions and modes of Nantun Formation tight reservoir in Wuerxun-Beier sags.The results show that the source rocks of Nantun Formation are mainly developed in the middle and lower part of Member 1 of Nantun Formation.With the rising and falling of lake level,the fan-delta front deposition continuously developed towards the lake basin center,braided river delta front deposition,and lacustrine fan deposition formed by collapse can provide sufficient sand bodies for oil accumulation in the tight oil reservoir.It is further confirmed the distribution of tight oil reservoirs in Nantun Formation is controlled by coupling the effective source rock and deposition fan,and the tectonic setting and dominant sand body are decisive factors for the enrichment of tight oil reservoirs in Nantun Formation.According to the source-reservoir configuration,the tight reservoirs in Nantun Formation can be further divided into the source-reservoir integrated type and the upper source with lower reservoir type.In 2023,the oil company initially deployed Well X38-2H for oil testing in the tight source-reservoir integrated reservoir with more favorable accumulation conditions,and obtained the high production industrial oil flow of 23.2 t/d,which confirms that the current geological understanding and engineering technology can realize the

关 键 词：海拉尔盆地 乌尔逊—贝尔凹陷 南屯组 致密油 成藏模式 

分 类 号：TE122.3[石油与天然气工程—油气勘探]