摘要
当地层中存在过渡岩性(粉砂质泥岩、泥质粉砂岩)时,各种岩性之间形成波阻抗差,造成了实际地震资料中的同向轴不是砂、泥岩之间的分界面,而是多种岩性共同影响的结果,从而影响地震资料对砂岩储层的预测能力,降低了储层预测的可信度。利用测井解释成果得到岩性波阻抗曲线,通过岩性波阻抗曲线和测井波阻抗曲线与空变子波分别进行三维正演模拟。将2种不同正演结果进行对比分析,确定二者之间的差异并利用其确定过渡岩性影响的区域和范围,通过处理和计算屏蔽过渡岩性在地震资料中的影响,得到高可信度的地震资料;然后通过分区分时窗提取地震属性,预测储层的分布特征及范围。应用该方法提高了储层预测可信程度,改善了储层预测效果。
When there exist the transitional lithologies( silty mudstone and muddy silty sandstone) in the formation,the differentials of the wave impedance will appear among each lithology. Thus the results are caused from the joint influences of the multiple lithologies,not the interfaces between the sandstones and mudstones for the events in the actual seismic data,and moreover the predicting capacity for the sandstone reservoirs is influenced by the seismic data,in a word,the confidence level of the prediction is reduced. With the help of the well logging interpretations,the curves of the lithological wave impedance were obtained,by means of the curves and logging wave impedance curves and space variant wavelets,the 3D forward modelings were respectively conducted. Contrasting and comparing between the two different forward modeling results,the differentials between them were determined,and furthermore the influenced region and range by the transitional lithologies were made sure on the basis of the above achievements,through processing and computing,these influences were shielded,and then the higher-confidence-level seismic data were obtained; by means of the seismic attributes extracted by the partition block and window,the distribution characteristics and range of the reservoirs were predicted. With the help of the method,the confidence level of predicting the reservoirs is enhanced a great deal,so the predicted results are improved.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2016年第4期132-136,共5页
Petroleum Geology & Oilfield Development in Daqing
基金
国家重大科技专项"特低渗透油藏有效开发技术"(2011ZX05013-006)
关键词
储层预测
正演模拟
岩性波阻抗
过渡岩性
属性提取
reservoir prediction
forward modeling
lithological wave impedance
transitional lithology
attribute extraction
