高弯曲分流河道中废弃河道的精细识别及分布模式  

Fine identification and distributing model of abandoned channels in delta distributary channel sands

作　　者：蔡东梅[1] 杨会东[1] 孙立东[1] 刘朋坤[1] 杨丽瑛[1] 石荣[1] CAI Dongmei;YANG Huidong;SUN Lidong;LIU Pengkun;YANG Liying;SHI Rong(Exploration and Development Research Institute, Daqing Oilfield Company Limited, PetroChina, Daqing 163712, China)

机构地区：[1]中国石油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：《中国石油大学学报（自然科学版）》2020年第6期21-27,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家重大专项(2011ZX05010-001);中石油股份公司重大专项(2016ZX05054)。

摘　　要：鉴于松辽盆地大型湖盆浅水三角洲沉积体系中废弃河道平面组合面貌和成因的复杂性,及其对老油田剩余油潜力有效开发的重要性,以大庆长垣河流-三角洲高弯曲分流河道为研究对象,以丰富的岩心、测井和高密度三维地震资料为基础,综合利用不同成因废弃河道的地球物理综合响应特征分析、岩心观察描述及地震沉积学等技术手段,系统分析渐弃型、轻度废弃型及重度废弃型3种废弃河道测井相、地震波形及振幅属性特征,建立“井点微相控制与地震沉积学平面预测协同分析”的废弃河道精细描述方法,实现复杂废弃河道的精细识别。结果表明井震结合废弃河道精细描述方法使废弃河道的平面识别精度提高11%;依据废弃河道分布的复杂程度,可建立截弯取直模式、可分连续多河道模式、交叉连续多河道模式、交叉不连续鳞片状模式4种分布模式;应用上述模式指导废弃河道导致的“局部遮挡型”剩余油精细挖潜,应用效果良好,能够为水聚两驱综合措施调整提供可靠的依据。In view of both the origin and distribution of the abandoned channel and the importance to remaining oil exploitation in oldfields,the large shallow-delta sedimentary system of Songliao Basin is targeted in this study.The characters and distributing model of abandoned channels in the delta distributary channel sands are studied using drilling cores,logging data and high transverse density of 3D seismic data,as well as the analysis of geophysical response characteristics,core facies and seismic sedimentology analysis.The characteristics of log phases,seismic waveforms and amplitude properties of decayed rivers,light abandoned rivers and severe abandoned rivers,are systematically studied.The fine characteristics method of abandoned river channel that directed by seismic attribution and controlled by single well facies is established,thus the fine identification of the complex abandoned river channel is realized.The results show that compared with relying on only well data,accuracy in the abandoned channel identification is improved by 11%with the new method.According to the degree of complexity of abandoned channels,four distribution models are established,including single channel mode,truncated bending and straightening mode,divisible continuous multi-channel mode,cross-continuous multi-channel mode,and cross-discontinuous scale mode,respectively.Applying the above model to guide the fine excavation of the"partial occlusion type"residual oil caused by the abandoned river channel has been approved efficient,which provides a reliable basis for syntheses measure adjustment of water flooding and fusion flooding.

关 键 词：大庆长垣 废弃河道 开发地震 平面分布模式 

分 类 号：TE122.2[石油与天然气工程—油气勘探]