海拉尔盆地乌尔逊凹陷水文地质特征与油气运聚关系

RELATIONSHIP BETWEEN HYDROGEOLOGY FEATURES AND HYDROCARBON ACCUMULATION IN WUERXUN SAG, HAILAER BASIN

张秋 聂志阳 谭志伟 张作祥 刘凤霞

Zhang Qiu Nie Zhiyang Tan Zhiwei Zhang Zuoxiang Liu Fengxia

中国石油天然气股份有限公司, 大庆油田有限责任公司, 勘探开发研究院, 黑龙江, 大庆, 163712

Exploration and Development Research Institute of Daqing Oilfield, Petro China, Daqing, Heilongjiang 163712, China

沉积盆地内的地下水是油气运移的重要载体,水文地质特征是控制或影响油气藏的边界条件。在划分盆地内含水岩系的基础上,采用水动力场与水化学场相结合的方法,对海拉尔盆地乌尔逊凹陷主要含水岩系的水文地质条件进行研究,划分出3个不同性质的水文地质区带:交替活跃—氧化区带,开启程度高,不利于油气赋存;交替缓慢—弱还原区带,较有利于油气藏形成;交替阻滞—还原区带,封闭程度高,有利于油气藏形成,是油气勘探最有利的目标区域。

Groundwater is an important carrier of hydrocarbon migration in sedimentary basins.Hydrogeological characteristics can control or influence reservoir boundary.On the basis of classifying water-bearing rock series,combining hydrodynamic field with hydrochemical field,the hydrogeological conditions of main water-bearing rock series have been studied in the Wuerxun Sag of the Hailaer Basin.It is divided into 3 different types of hydrogeological zones: a)actively alternating—oxidation zone,which is highly open and is unfavorable for oil and gas accumulation;b)slowly alternating—weak reduction zone,which is more favorable for reservoir formation;c)alternation blocked—reduction zone,which is closed in high degree and is conducive for reservoir formation,hence is the most favorable target area for exploration.

https://doi.org/10.11781/sysydz201005453