叠前多重降维复杂岩性预测技术——以元坝西部须三段为例  

Complex lithology prediction technique based on pre-stack multiple dimensionality reduction:a case study for the Member 3 of Xujiahe Formation in western Yuanba area,Sichuan,China

作　　者：盛秋红[1] 

机构地区：[1]中国石油化工股份有限公司勘探分公司,成都610041

出　　处：《成都理工大学学报（自然科学版）》2016年第4期447-453,共7页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家科技重大专项(2011ZX05002-004)

摘　　要：川东北元坝西部地区上三叠统须家河组第三段岩性复杂多样,储层岩性以钙屑砂岩为主,不同类型岩性地球物理响应特征差异小,岩性预测难度大。针对上述难点,开展叠前多重降维复杂岩性预测技术研究。多重坐标变换逐次降维可将2个弹性参数合并成1个岩性区分能力最大的新弹性常数,用于识别目标岩性。提出了基于叠前多重降维分析的岩性预测的实现流程,以岩石物理分析为基础,多重坐标变换降维为核心,对相控约束叠前弹性参数反演得到的弹性参数数据体进行多重降维,从而实现复杂岩性分布预测。元坝西部须三段钙屑砂岩预测的应用分析证实了该方法预测精度高、实用性强。T he lithological com position of the M em ber 3 of U pper T riassic Xujiahe Form ation inY uanba w estern region, Sichuan is very com plicated and is com posed m ainly of calcareous sandstonew ith m inor differences in geophysical responses, w hich lead to great difficulties in lithologicalprediction. Com plex lithology prediction technique of pre-stack m ultiple dim ensionality reduction iscarried out to solve this problem . A new elastic param eter, as a com bination of tw o other elasticparam eters by using m ultiple successive coordinate transform ation dim ensionality reduction, can getbest result in distinguishing different lithology. Based on rock physics and m ultiple successivecoordinate transform ation dim ensionality reduction, the elastic param eters from pre-stack elasticinversion constrained by sedim entary facies are transform ed to new elastic param eter, w hich highlyim proves the ability of lithological identification. T he successful application of the prediction m ethodin Y uanba w estern region proves to be of high prediction precision and practicability.

关 键 词：钙屑砂岩 坐标变换 多重降维 岩性预测 

分 类 号：TE132.14[石油与天然气工程—油气勘探] P631.4[天文地球—地质矿产勘探]