井震结合表征曲流型河道储层叠置样式:以准噶尔盆地东部阜东5井区侏罗系头屯河组为例

针对阜东5井区大井距下曲流型河道储层叠置样式认识不清的问题，应用岩心、地震、测井、试油试采等资料，采用井震联合、层次结构和地震正演等研究方法，确立了沉积微相类型，分层次开展了河道储层叠置样式和地震正演河道砂体叠置地震响应特征研究，提出了曲流型河道储层叠置分布样式.研究表明:（1）目的层自下而上呈曲流河三角洲→曲流型分流河道体系→曲流河.头一段时期发育曲流河三角洲沉积，多个朵叶状砂体连片叠置.头二段演变为曲流型分流河道体系，砂体呈条带状叠置；头三段为曲流河，砂体呈宽条带交错叠置状.（2）在合理地震正演参数设置后，对曲流型河道分4类开展正演模拟.不同期次的单河道相互叠置使得复合河道的地震反射表现出单斜状、阶梯状、下凹状的特征，同时伴随振幅的横向强弱变化，结合单井测井标定可判断单河道的发育期次和叠置关系.（3）曲流型河道储层叠置样式主要分为单河道型、多河道叠置型和稳定迁移型3种样式.单河道型地震反射振幅短轴强振幅特征，呈窄连续条带状分布（约250 m）；多河道叠置型地震反射振幅强弱变化大，呈连续性较差宽条带状分布（约500 m）；稳定迁移型地震响应波形振幅强度变化弱且连续，呈大范围连片状分布（约1 500 m）.研究不仅对曲流型河道油气储层提高采收率具有重要的指导意义，也对井震结合大井距河道砂体储层构型表征方法的拓展意义重大. 

Reservoir Superposed Pattern Characterization of Well-Logging and Seismic Data Calibration with Meandering Channels: A Case Study of Jurassic Toutunhe Formation in Fudong No.5 Well Area,Eastern Junggar Basin

Characterization of meandering channel reservoir superposed pattern is difficult to Fudong No.5 well area with large well spacing. Using the data of core, seismic, logging, and production test, and the methods of well-logging seismic data calibration, hierarchical architecture, and seismic forward modeling, in this study it established the microfacies, hierarchical meandering channel sand bodies, and the response characteristics of the waveform in the seismic forward modeling of superimposed channel sand body. The results show follows: (1) It is a complete cycle from bottom to top, with meandering river delta, distributary channel system to meandering river. At the first member, it is the development of meandering river delta depositional system, superposition of multiple lobes sand body. At the second member, it has evolved into meandering distribution channel system, and the sand body is stacked with banded shape. At the third member, it is the meandering river depositional system, and the sand body is wide banded shape overlapped. (2) There are four classes of the meandering channel to be launched in seismic forward modeling, after setting up the reasonable parameters of the work area. The relationship between developmental stages of single channel can be comprehensively determined by the well-logging calibration and the monoclinal, stepped, concave characteristics that overlapping of single channels at different periods shows in the seismic reflection, along with the transverse strength change of the amplitude. (3) The meandering channel sand bodies in the study area can be divided into three types: single channel, multi-channel superposition and stable migration channels. The single channel type seismic reflection amplitude is strong in the middle and weak on both sides, presenting a continuous banded distribution, with a width about 250 m, while the multi-channel superimposed type seismic reflection amplitude is greatly varied in strength and the distribution of superimposed banded poorly continued, with a width about 500 m. The stable migration channel type seismic response waveform changes weakly and continuously, presenting a large range of continuous distribution, and a width about 1 500 m. The research is not only of great practical significance for improving oil recovery of meandering channel reservoirs by using horizontal wells, but also of great significance for enriching characterization method of large well spacing meandering channel architecture combined with well-logging and seismic.