摘要
辽河西部凹陷沙四段细粒沉积区发育的薄砂岩是下步岩性油气藏勘探的潜在领域。为解决受资料品质、岩性复杂、断裂发育的限制,曙北地区薄砂岩储层预测难度大且不准确的问题,在曙北地区沙四段薄砂岩储层中进行了等时相控波形指示模拟反演应用。首先以沉积认识为指导,建立高频等时层序格架;然后根据地层及岩性组合特征开展正演模型分析,利用波形指示模拟反演软件的反演模块分别进行敏感曲线重构、等时相控建模和波形指示反演;最后采用门槛值法确定种子点,追踪砂体、刻画厚度,定量预测薄砂岩发育区。应用结果显示,砂岩预测厚度吻合率约为80%,砂体展布特征与实际地质规律相符,表明等时相控波形指示模拟反演可作为资料品质低、岩性复杂、断裂较发育地区薄砂岩储层预测的有效手段。
Thin sandstone developed in fine-grained sedimentary area of the fourth member of Shahejie formation(S4)in western Liaohe sag is a potential field for lithologic reservoir exploration in the next step.However,due to the limitation of seismic data quality,complex lithology and fracture development,it is difficult to predict the thin sandstone reservoir in Shubei area,which restricts the further oil and gas exploration.Based on the establishment of the high frequency isochronous sequence framework and the guidance of sedimentary understanding,the forward model analysis is carried out according to the characteristics of formation and lithology combination firstly.Then the inversion module of SMI software is used for sensitive curve reconstruction,isochronous phase-control modeling and seismic motion inversion.Finally,the threshold value method was used to determine the seed point,track the sand body,characterize the thickness,and quantitatively predict the thin sandstone development area.The application results show that the predicted thickness coincidence rate of sandstone is 80%,and the distribution characteristics of sand body are in consistent with the actual geological law,which indicates the isochronous phased waveform indication simulation inversion is an effective method for the prediction of thin sandstone reservoirs in regions with low data quality,complex lithology and relatively developed faults.
作者
刘少治
王波
宋兵
陈昌
陈希光
LIU Shaozhi;WANG Bo;SONG Bin;CHEN Chang;CHEN Xiguang(Hangzhou Research Institute of Geology,PetroChina,Hangzhou,Zhejiang 310023,China;Exploration&Development Research Institute of Liaohe Oilfield Company,PetroChina,Panjin,Liaoning 124010)
出处
《石油地质与工程》
CAS
2022年第3期1-7,共7页
Petroleum Geology and Engineering
基金
国家重大科技专项(2017ZX05001002)
中国石油科技重大专项(2019B-0309)联合资助。
关键词
曙北地区
储层预测
薄砂岩
等时相控
Shubei area
reservoir prediction
thin sandstone
isochronous phase-controlled
作者简介
刘少治(1968-),男,高级工程师,现从事地球物理勘探研究工作。E-mail:liusz_hz@petrochina.com.cn。
