溱潼凹陷西斜坡构造-岩性圈闭识别技术及应用效果

Identification technology of structural-lithologic traps and its application effect in the western slope of Qintong Sag,China

探讨溱潼凹陷西斜坡古近系阜宁组第三段薄砂岩储层的构造-岩性圈闭识别技术。以断裂系统研究为基础,评价断层的侧向封堵和油气输导能力;针对岩性油藏薄储层预测的难点,建立正演模型分析薄砂体对地震波形的影响。通过敏感参数分析,优选SP敏感曲线进行波形指示反演,识别出阜宁组第三段薄层砂岩的展布特征及一系列的构造-岩性圈闭群。

This paper discusses the tectonic-lithologic trap identification technology of the third member of the Paleogene Funing Formation(E f 3)in the west slope of Qintong Depression.Based on the study of fault system,the lateral sealing and oil and gas transmission capacity of fault are evaluated.Aiming at the difficulty of predicting lithologic thin reservoir,the forward model is established to analyze the influence of thin sand body on seismic waveform.Based on the analysis of sensitive parameters and the waveform indication inversion of SP sensitive curve,the distribution characteristics and a series of structural-lithologic traps of thin-bedded sandstone in the third member of Funing Formation are identified.The result shows that the application of structural-lithologic trap to the analysis of E f 3 in western slope of Qintong Sag has made a great success,and hundreds million tons of oil reserves have been discovered.It may provide necessary guidance for the future exploration.