灰质背景下薄互层浊积岩储层预测方法研究  

Research on predictionmethods for thin interbedded turbidite reservoirs under gray background

作　　者：窦铭 Dou Ming(Geophysical Research Institute of Sinopec Shengli Oilfield Branch,Dongying 257000)

机构地区：[1]中国石化胜利油田分公司物探研究院,山东东营257000

出　　处：《石化技术》2024年第7期290-292,286,共4页Petrochemical Industry Technology

摘　　要：NZ洼陷N25块沙三中亚段浊积岩具有“个体小(单砂体面积<2km~2)、厚度薄、横变快”的特点,受深层地震资料分辨率不足及灰质泥岩的影响,常规物探描述方法无法有效预测储层展布范围。为此,在正演模拟的基础上,应用混合相位子波反褶积技术,提高地震纵向分辨率;采用子波分解与重构技术对拓频后地震数据进行处理,突出储层地震反射特征,再利用基于岩性敏感曲线的波形指示反演方法,精细刻画砂体边界。结果表明:子波分解重构技术有效屏蔽了灰质成分的影响,基于岩性敏感曲线的波形指示反演方法提高了预测精度,N25块5m以上储层预测厚度与实钻储层厚度符合率达85%。综合应用储层描述成果,在N25块部署油井8口,均钻遇较厚油层,投产获工业油流,新建产能2.2万吨。The turbidite in themiddle sub section of the third sand body in block N25 of the NZ depression has the characteristics of small individual size(single sand body area<2km2),thin thickness,and fast lateral variation.Due to the insufficient resolution of deep seismic data and the influence of graymudstone,conventional geophysical descriptionmethods cannot effectively predict the distribution range of reservoirs.Therefore,based on forward simulation,mixed phase wavelet deconvolution technology is applied to improve the longitudinal resolution of earthquakes;Using wavelet decomposition and reconstruction techniques to process the seismic data after frequency expansion,highlighting the seismic reflection characteristics of the reservoir,and then using waveform indication inversionmethods based on lithology sensitive curves tofinely characterize the boundaries of the sand body.The results show that the wavelet decomposition and reconstruction technology effectively shields the influence of graymatter components,and the waveform indication inversionmethod based on lithology sensitive curves improves the prediction accuracy.The predicted thickness of reservoirs above 5m in N25 block is consistent with the actual drilled reservoir thickness by 85%.Based on the comprehensive application of reservoir description results,8 oil wells were deployed in N25 block,all of which encountered thicker oil layers.Industrial oilflow was obtained after production,and a new production capacity of 22000 tons was built.

关 键 词：灰质背景 浊积岩 子波分解 波形指示反演 

分 类 号：P618.13[天文地球—矿床学]