摘要
大庆长垣及西部地区嫩江组一、二段泥岩盖层宏观上具有厚度大、面积大、分布广泛的特点，微观上则表现为微孔为主、渗透率低、比表面积大、排替压力高，形成欠压实孔隙流体超压和烃浓度封闭等特征。毛细管封闭约形成于嫩江组三段中期，深度约为６５ｍ，压力及烃浓度封闭约形成于明水组晚期，深度约为８００ｍ。齐家古龙凹陷为Ⅰ级封闭区，具有较强的毛细管封闭能力，齐齐哈尔西北部为Ⅲ级封闭区，其余为Ⅱ级封闭区。
Abstract Based on the macroscopic and microscopic analyses of mudstone caprocks sealing property of the first and second members of the Nenjiang Formation,the caprock is characterized by big thickness,extensive distribution.The caprock contains mainly micropores with low permeability and big specific surface area,thus forming uncompacted pore fluid superpressure and dense hydrocarbon sealing.Capillary sealing formed in the middle stage of the 3rd member of the Nenjiang Formation with the depth of 65 m;pressure and dense hydrocarbon sealing formed in late Mingshui Formation stage and the depth is 800 m.It is suggested that Qijia Gulong Sag belongs to grade I sealing area with high capillary sealing ability,the northwestern part of Qiqihar belongs to grade Ⅲ sealing area and the rest belong to grade Ⅱ area.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1998年第3期232-231,共1页
Oil & Gas Geology
