用泥岩热解资料预测储层次生孔隙发育带  

PREDICTION OF SECONDARY PORE ZONE IN RESERVOIRS WITH ROCK-EVAL DATA OF MUDSTONE

作　　者：孟元林[1] 修洪文[1,2] 孟凡晋[1] 殷秀兰[3] 王志国[2] 黄文彪[1] 姜文亚[1] 

机构地区：[1]大庆石油学院 [2]中国石油大庆油田勘探开发研究院 [3]中国地质环境监测院

出　　处：《天然气工业》2008年第10期41-43,共3页Natural Gas Industry

基　　金：国家“十五”重大科技攻关项目(编号:2003BA613A01);国家自然科学基金项目(编号:40372102)的部分研究成果

摘　　要：为了应用泥岩热解资料预测储层次生孔隙发育带的深度,进行了泥岩热解与有机酸测试的对比实验。实验结果表明,泥岩热解S3(S3为岩石热解P3峰,代表有机二氧化碳的总含量)与剩余总有机酸含量之间存在着良好的线性关系。应用所得到的经验公式和泥岩热解资料,计算了渤海湾盆地辽河西部凹陷南段泥岩的剩余总有机酸含量。结果表明:单井泥岩剩余总有机酸含量与储层次生孔隙发育带存在着良好的对应关系,有机酸的高值带对应于次生孔隙发育带;当深层泥岩中剩余有机酸的含量低于50μg/g时,次生孔隙发育带逐渐消失;该地区泥岩有机酸含量大于50μg/g对应的深度范围为1500～3850m,就是储层次生孔隙发育带的深度范围。采用该方法预测的深层(埋深超过3500m)储层次生孔隙发育带的下限深度,可以作为深层油气勘探的依据。Comparative test of mudstone pyrolysis and organic acid concentration measurement is performed to predict the depth of secondary pore zone in reservoirs by using rock-eval data of mudstone.The results show that good linear relation exists between mudstone pyrolysis S3,which is the P3 peak representing the total content of organic carbon dioxide,and the total residual organic acid.The empirical formula and rock-eval data of mudstone are used to calculate the total residual organic acid of mudstone in the southern part of Liaoxi depression in the Bohai Bay basin.The following results are obtained:the total residual organic acid of mudstone in a single well correlate well with secondary pore zone in reservoirs,with the high value interval of organic acid corresponding to secondary pore zones;the secondary pore zone dies out progressively when the residual organic acid of deep mudstone is smaller than 50 μg/g,a total residual organic acid value over 50 μg/g corresponds to a depth interval of 1500-3850 m,which is the depth range of secondary pore zone in the reservoirs in the study area.This shows that rock-eval data of mudstone or geochemical log data can be used to predict the lower limit of burial depth of secondary pore zone in deep reservoirs with a burial depth over 3500 m,thus providing a robust basis for deep oil and gas exploration.

关 键 词：泥岩 热解 有机酸 次生孔隙发育带 地球化学录井 深层 辽河西部凹陷 

分 类 号：P618.13[天文地球—矿床学]