埕岛油田东斜坡层序约束下的储层预测技术

由于埕岛油田东部斜坡带东营组储层埋藏深、相变快、且常常与围岩速度差异小,依据目前的三维地震资料分辨该区东营组单个砂层及进行层位标定难度较大,从而无法了解储层的空间展布规律。本文通过钻井、测井和地震资料的综合分析及东营组长期旋回内部界面的识别,将东营组长期旋回自上而下划分为层序S1、S2、S3、S4;根据东营组储层的各种沉积相具有独特的地震波组响应特征,通过扩大砂体研究对象,从层序约束的角度,以砂体所在沉积韵律或旋回为目标,充分利用地震资料进行储层预测,形成了一套有效的储层预测技术。主要流程包括层序划分与解释、宏观地震相解释、时窗界定、在无井控制下的聚类分析储层预测、在有井约束下的储层平面预测。通过宏观地震相解释、综合瞬时相位切片、BP神经网络储层预测图,进行该区块砂体追踪和解释,取得了良好的效果。

Reservoir prediction by sequence controlled at east slope reservoir of Chengdao offshore oil-field,Shengli

Dongying Formation at east slope reservoir of Chengdao offshore oil-field of Shengli Oilfield imbeds deeply,its facies change quickly and usually have little difference of velocity with enclosed rock.So it is difficult to identify and calibrate single sandstone based on available 3D seismic data.And the distribution of reservoir cannot be found.In this paper we present our interior interface identification of Dongying formation cycle combined with drilling,logging and seismic data.Dongying formation cycle is divided into four sequences: S1,S2,S3 and S4.According to seismic wave group characteristics of sedimentary facies in Dongying formation,the paper reviews reservoir prediction based on seismic combined with geological information.The main procedures include sequence classification and interpretation,seismic faices interpretation,sedimentary body time window definition,reservoir prediction by clustering analysis without well controlled,and reservoir plane prediction with well controlled.With these integrated approach,good results are achieved in reservoir prediction in this area.