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塔中地区石炭系泥岩是该区下奥陶统古潜山和石炭系内部油层的区域性盖层，它具有物性封闭、压力封闭、烃浓度封闭三种封闭机理，对该区油气的聚集与保存起着重要的作用。在对其宏观和微观封闭特征进行全面分析的基础上，用主要评价参数划分盖层封闭能力的等级并赋予不同的权值，再利用加权平均法计算盖层综合评价权值的方法，对塔中地区石炭系泥岩盖层进行了综合评价，认为该区石炭系泥岩盖层具有好—中等的综合封闭能力。
The Carboniferous mudstone in Tazhong area is a regional cap rock of the Lower Ordovician buried hill and the Carboniferous oil reservoir in the area. It has three sealing mechanisms: physical property closed, pressure closed and hydrocarbon concentration closed. Preservation plays an important role. On the basis of a comprehensive analysis of its macroscopic and microscopic closed features, the main evaluation parameters are used to classify the cap sealing ability and give different weights, and then the weighted average method is used to calculate the comprehensive evaluation weight of the cap. Comprehensive evaluation of Carboniferous mudstone cap rocks in the middle region indicates that the Carboniferous mudstone caprocks in this area have good-medium comprehensive sealing ability.