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在前人研究的基础上，对泥岩涂抹作用造成的断层侧向封闭性进行了深入分析。应用Ｌｉｎｄｓａｙ等（１９９３）提出的泥岩涂抹系数及其与断层侧向封闭性之间的定量关系，以松辽盆地三肇凹陷汪家屯气田Ｗ１、Ｗ２、Ｗ３、Ｗ４断层及塔里木盆地轮南地区轮南断层和轮南南断层为例，计算其断开主要目的层盖层段泥岩涂抹系数，对这些断层在主要目的层段处形成的侧向封闭性及其对油气运聚所起的控制作用进行了研究。应用结果表明，泥岩涂抹系数是研究断层侧向封闭性的一个有效指标。
Based on the previous studies, the lateral confinement of faults caused by smear of mudstone is analyzed in depth. Applying the quantitative relationship between the mudstone smearing coefficient and its lateral sealing property proposed by Lindsay et al. (1993), the W 1, W 2, W 3, W 4 faults in the Wangjiatun gas field in Sanzhao Sag, Songliao Basin and the Lunnan The fault and the South Lunnan fault are taken as an example to calculate the mudstone smearing coefficient of the caprock of the main purpose fault and to control the lateral confinement of these faults and their control over the hydrocarbon migration and accumulation Study. The application results show that the mudstone smearing coefficient is an effective index for studying the lateral sealing of faults.