西湖凹陷Y气田平湖组上段沉积相特征及有利砂体预测  

Sedimentary Facies Characteristics and Sandstone Body Prediction of the Upper Part of Pinghu Formation,Y Gas Field

作　　者：薛丹[1,2] 胡明毅[1,2] 邓猛[1,2] 

机构地区：[1]长江大学油气资源与勘察技术教育部重点实验室 [2]长江大学地球科学学院,武汉430100

出　　处：《科学技术与工程》2014年第24期40-47,共8页Science Technology and Engineering

基　　金：国家科技重大专项(2011ZX05023)资助

摘　　要：平湖组为西湖凹陷重要的含油气层之一,是今后寻找有利储层的优选层位.以精细岩芯观察为基础,根据岩相、沉积构造等相标志特征,确定工区平湖组上段为三角洲平原亚相,进一步细分为分支河道、天然堤、决口扇、沼泽等4类微相.在单井沉积相分析的基础上,结合地震属性分析、泥质含量反演、波阻抗反演成果,认为工区物源主要来自工区北部,河道主要呈南北向展布,在此基础上,编制了工区的沉积微相平面分布图,分析了沉积相纵向演化规律,预测了工区内平湖组上段的有利砂体分布区,该区砂体总体面积较大,砂厚在105- 115 m,据已钻井的资料统计,已经证实了预测结果的可靠性较高,可作为下一步勘探开发寻找油气的优选部位.Pinghu Formation is one of the important oil and gas layers in Xihu Depression,and is also favorable sand body area to find in the future.Based on analysis of meticulous core observation,combining with facies marker features which include lithofacies and sedimentary structures,the upper part of Pinghu Formation in Y gas field mainly developed delta plain subfacies,which can be further classified into delta plain distributary channel,natural levee,erevasse splay and flood swamp deposition.Based on single-well sedimentary facies analysis,combining the results of seismic attributes analysis,mud content inversion and wave impedance inversion,sources of the study area mainly come from the northern area,and current direction of stream is from north to south.On this basis,the planar distribution maps of sedimentary microfacies are drawn,and the vertical evolution laws are analyzed,and distribution areas of favorable sand body are predicted,where is the preference location of further exploration and development for oil and gas.The total area of sand body is larger,sand thickness is about （105-115） m.According to drilled statistics data,prediction results in some areas have been confirmed its reliability.

关 键 词：砂体预测 沉积相 地震属性反演 平湖组上段 西湖凹陷 

分 类 号：TE121[石油与天然气工程—油气勘探]