【摘要】 渤海湾盆地沾化凹陷渤南洼陷古近系沙四段发育湖相碳酸盐岩滩坝储集层,该类储集层具有埋藏深、单层厚度薄、主要为薄互层沉积、岩石类型复杂多样、岩相横向变化大的特点,有效储集层预测是该区油气勘探的主要难题。在对岩相及地震响应特征分析基础上,开发了基于沉积参数的复杂岩相识别新技术,从常规的振幅类、频率类等地震属性分析出发,提取三维地震属性,统计井点处的灰岩百分含量等沉积参数,进而通过建立实际钻井沉积参数与井旁地震属性的拟合关系来反算多种沉积参数的平面特征,再以沉积参数为变量进行聚类分析,以实现对沉积相带的预测。该方法在渤南洼陷古近系沙四段湖相滩坝储集层预测中取得了较好的效果,对其他类型沉积体系的研究也具有借鉴和参考意义。更多还原

【Abstract】 The lacustrine carbonates are developed in the Paleogene Sha 4 Member of the Bonan Subsag in the Zhanhua Sag of the Bohai Bay Basin.This type of reservoirs is characterized by deep-burial,thin bed,thin alternated bed deposition,complicated rock types,and a dramatic lateral change of lithofacies,so the main problem of its exploration is the identification of effective reservoirs.On the basis of analyzing rock facies and geophysical features,this paper develops a new technique for the prediction of complicated lithofacies based on sedimentary parameters.It begins from the normal seismic attributes analysis such as amplitude and frequency types,extracts the 3D seismic attributes,counts the sedimentary parameters such as the percent of the limestone,and sets up the relationship of the sedimentary parameters from wells and the seismic attributes along wells,and then computes the lateral features of many sedimentary parameters.At last,the cluster analysis is done to predict the sedimentary facies.This technology gets a preferable result in the Sha 4 Member of the Bonan subsag,and it can provide some reference for other types of depositional system.更多还原