摘要
古岩溶储集岩储集空间类型复杂 ,识别与预测都有很大难度。研究表明 ,该类储层孔隙空间以洞穴、裂缝、裂缝孔洞、孔洞为主。针对这 4种孔隙空间设计了物理模型 ,来模拟地震反射特征 ,开展正演模拟研究。研究结果表明 ,洞穴内充填物速度很低时 ,在单炮和叠加记录剖面上能观测到明显的绕射 ,在二维叠加剖面上表现为短轴状较强的反射 ;裂缝发育带在地震反射上出现明显的异常 ,呈现“杂乱”反射特征 ;多组裂缝与孔洞的交叉部位附近 ,可能出现“串珠状”强反射 ;
The type of Palaeokarst reservoir space is complex, which is difficult to be recognized and predicted. Study shows that the pore space of this kind of reservoir is mainly consisted of caves, fracture, fracture and vugs. In connection with 4 types of pore spaces, a physical model is designed to simulate seismic reflection characters and conduct forward simulation. The result of study shows that when the velocity is very low in the cave, obvious diffraction can be observed on single-shot and stack profile, and stronger short axis reflection is represented on 2D stack profile, the fracture growing belt is obvious abnormal on seismic reflection with “chaotic” reflecting property. Strong beaded reflection appears near the cross-over position of multi-group fractures and vugs, vug reservoir represents a stronger discontinuous reflection on seismic profile.
出处
《江汉石油学院学报》
EI
CSCD
北大核心
2004年第4期74-76,共3页
Journal of Jianghan Petroleum Institute
基金
国家基础研究项目"973"研究专项 (2 0 0 2CCA0 0 70 0 )
