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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。
In order to predict the depth of secondary porosity zone in mudstone using pyrolysis data of mudstone, comparative experiments on pyrolysis of mudstone and organic acid were carried out. The experimental results show that there is a good linear relationship between the pyrolysis S3 of mudstone (S3 is the P3 peak of pyrolytic rock, representing the total content of organic carbon dioxide) and the residual total organic acids. Based on the empirical formula obtained and the data of mudstone pyrolysis, the residual total organic acid content of mudstone in the southern section of western Liaohe Basin in Bohai Bay Basin was calculated. The results show that there is a good correlation between the residual organic acid content of single-well mudstone and the secondary pore development zone of the reservoir, and the high value zone of organic acid corresponds to the secondary pore development zone. When the residual organic acid content in the deep mudstone is low At 50μg / g, the secondary pore development zone gradually disappears. The organic acid content of mudstone in the area is greater than 50μg / g and the corresponding depth range is 1500 ~ 3850m, which is the depth range of the secondary pore development zone. The lower limit depth of the secondary porosity development zone in the deep reservoir (more than 3500m depth) predicted by this method can be used as the basis for deep-seated oil and gas exploration.