陆相页岩油效益勘探开发关键技术与工程实践——以渤海湾盆地沧东凹陷古近系孔二段为例  

Key exploration&development technologies and engineering practice of continental shale oil:A case study of Member 2 of Paleogene Kongdian Formation in Cangdong Sag,Bohai Bay Basin,East China

作　　者：周立宏[1] 赵贤正[1] 柴公权[1] 姜文亚[1] 蒲秀刚[1] 王晓东[1] 韩文中[1] 官全胜[1] 冯建园[1] 刘学伟[1] ZHOU Lihong;ZHAO Xianzheng;CHAI Gongquan;JIANG Wenya;PU Xiugang;WANG Xiaodong;HAN Wenzhong;GUAN Quansheng;FENG Jianyuan;LIU Xuewei(Dagang Oilfield of CNPC,Tianjin 300280,China)

机构地区：[1]中国石油大港油田公司,天津300280

出　　处：《石油勘探与开发》2020年第5期1059-1066,共8页Petroleum Exploration and Development

基　　金：中国石油天然气股份有限公司重大科技专项“大港油区效益增储稳产关键技术研究与应用”(2018E-11)。

摘　　要：以系统取心井精细岩心描述和分析联测数据为基础,开展了陆相页岩油富集规律研究,形成了陆相页岩油甜点识别与定量评价方法、甜点层精准轨迹设计与随钻跟踪-轨迹优化地质工程一体化控制技术、全程"滑溜水+石英砂"陆相页岩油水平井低成本体积压裂改造技术。研究结果表明,沧东凹陷古近系孔二段陆相纯页岩型页岩油富集主要受优势组构相和滞留烃超越效应两大因素控制,具有纹层状长英质、纹层状混合质、薄层状灰云质及厚层状灰云质4种页岩油富集模式;页岩油甜点识别评价方法可准确预测陆相页岩油富集甜点区;甜点层精准轨迹设计与随钻跟踪-轨迹优化地质工程一体化控制技术经现场应用检验,效果良好,甜点钻遇率可达100%,Ⅰ类甜点钻遇率平均超过75%;采用全程"滑溜水+高石英砂"陆相页岩油水平井低成本体积压裂改造技术,可在水平段形成多期次缝网,大幅度提高产能,综合工程成本平均降低26.4%。Based on detailed core description and systematic joint test data,enrichment laws of continental shale oil have been examined deeply.Key technologies such as the identification and quantitative evaluation method for sweet spot,precise design and tracking of horizontal well trajectory,and the low-cost horizontal well volume fracturing technology of the whole process"slick water+quartz sand"for continental shale oil have been formed.The research results show that the enrichment of pure continental shale oil of the Paleogene Kong 2 Member in Cangdong Sag is controlled by predominant fabric facies and cross-over effect of retained hydrocarbons jointly;and there are four modes of shale oil enrichment,i.e.laminar felsic,laminar mixed,thin-layer limy and dolomitic,and thick-layer limy and dolomitic shales.The identification and evaluation method for shale oil sweet spots can predict sweet spots accurately.The precise trajectory design for sweet spot layer and tracking-trajectory optimization while drilling by considering geological and engineering factors have been proved effective by field application,with drilling rate of sweet spots reaching 100%and drilling rate of type I sweet spots reaching over 75%.The whole process"slick water+quartz sand"low cost volume fracturing has been proved effective in creating multistage fracture network in the horizontal section,and improved productivity greatly.It can lower the comprehensive engineering cost by 26.4%.

关 键 词：渤海湾盆地 沧东凹陷 陆相页岩油 甜点识别 水平井 轨迹优化 压裂改造 

分 类 号：TE122.2[石油与天然气工程—油气勘探]