海拉尔盆地大磨拐河组下段泥岩盖层封盖油气能力评价

Evaluation on Sealing Abilities of Mudstone Caprocks in the Lower Part of Dameguaihe Formation of Hailaer Basin

在全面分析海拉尔盆地大磨拐河组下段泥岩盖层发育特征及微观封闭特征的基础上，选取排替压力、异常孔隙流体压力、天然气体积分数、盖层厚度和沉积环境作为评价参数，通过对其划分等级，赋予权值，再利用加权平均值对海拉尔盆地８个主要断陷大磨拐河组下段泥岩盖层封盖油气能力进行了综合评价．结果表明：海拉尔盆地各断陷大磨拐河组下段泥岩盖层均具有较强的油气封盖能力。

Based on the analysis of the development and microcosmic sealing characteristics of mudstone caprock in the lower part of Damoguaihe formation of Hailaer Basin, this paper chooses displacement pressure, abnormal pore fluid pressure, gas volume fraction, thickness of caprock and sedimentary environment as evaluation parameters, evaluates comprehensively the sealing abilities of mudstone caprocks in the lower part of Damoguihe formation of eight main depressions of Hailaer Basin. The results indicate that the mudstone caprocks in lower part of Damoguaihe formation own stronger sealing abilities for oil and gas, which is the important condition for oil and gas to acumulate in the upper part of Nantun formation.