沧东凹陷陆相页岩油各向异性岩石力学关键参数确定方法  

Method for Determining Key Parameters of Anisotropic Rock Mechanics of Continental Shale Oil in Cangdong Sag

作　　者：丁娱娇[1] 李嘉宁 邵阳[1] 刘爱平[1] 董姜畅 刘宁静 DING Yujiao;LI Jianing;SHAO Yang;LIU Aiping;DONG Jiangchang;LIU Ningjing(Research Institude of Exploration and Development,PetroChina Dagang Oilfield Company,Tianjin 300280,China;College of Science,China University of Petroleum(Beijing),Beijing 102200,China;North China Branch,China National Logging Corporation,Renqiu,Hebei 062552,China)

机构地区：[1]中国石油大港油田公司勘探开发研究院,天津300280 [2]中国石油大学(北京)理学院,北京102200 [3]中国石油集团测井有限公司华北分公司,河北任丘062552

出　　处：《测井技术》2023年第3期275-283,共9页Well Logging Technology

基　　金：中国石油大学(北京)与中国石油天然气股份有限公司大港油田分公司校企联合项目“黄骅坳陷复杂油气藏基础理论与评价方法研究”课题二“黄骅坳陷页岩油甜点地球物理评价方法与三维地质建模”(2022JC-01)。

摘　　要：沧东凹陷孔二段(Ek2段)陆相页岩油目前已进入效益开发先导试验阶段,为实现规模效益开发,全面采用水平井钻完井和大型体积压裂技术,准确的岩石力学参数评价对沧东凹陷Ek2段陆相页岩油压裂改造至关重要。通过对比发现,水平井的声波速度与垂直井存在明显差异,均质各向同性岩石力学参数计算方法在水平井中应用受限。为寻找适合Ek2段陆相页岩油的岩石力学参数计算方法,设计了一套页岩油各向异性岩石力学参数测量方案,测量结果显示Ek2段陆相页岩油具有非常强的声波各向异性。分析发现,纹层发育是Ek2段陆相页岩油整体呈现强声波各向异性的主要原因,压力、岩性、有机碳对声波各向异性影响明显,物性对声波各向异性有一定影响,含油性对声波各向异性影响不明显。在岩心分析基础上建立Ek2段陆相页岩油声波各向异性表征方法和动静态岩石力学参数表征方法,该方法可为页岩油水平井压裂改造提供准确的岩石力学参数,在实际应用中取得良好的应用效果。The member Ek2 continental shale oil in the Cangdong sag has currently entered the stage of beneficial development and pilot testing.In order to achieve economy of scale development,horizontal well drilling and completion large-scale volume fracturing technology are being comprehensively adopted.Accurate evaluation of rock mechanical parameters is crucial for hydraulic fracturing reconstructing of the member Ek2 continental shale oil in the Cangdong sag.A comparison has revealed significant differences in acoustic velocity between horizontal and vertical wells,limiting the application of homogeneous and isotropic rock mechanical parameter calculation methods in horizontal wells.To find a suitable calculation method for the rock mechanical parameters of the member Ek2 continental shale oil,a measurement plan for the anisotropic rock mechanical parameters of shale oil is designed.Measurement results show that the member Ek2 continental shale oil exhibits strong acoustic anisotropy.Through analysis,it is found that the development of laminations is the main reason for the strong acoustic anisotropy of the member Ek2 continental shale oil.Pressure,lithology,and organic carbon have a significant impacts on acoustic anisotropy,physical properties have certain influences,and oil content has a less pronounced influences.Based on core analysis,a method for characterizing the acoustic anisotropy and dynamic-static rock mechanical parameters of the member Ek2 continental shale oil is established.This method can provide accurate rock mechanical parameters for hydraulic fracturing reconstructing of shale oil in horizontal wells and has achieved good application results in practical use.

关 键 词：测井评价 沧东凹陷 陆相页岩油 声波各向异性 纹层 岩性 物性 含油性 

分 类 号：P631.84[天文地球—地质矿产勘探]