松辽盆地西部斜坡带中南部大岗地区上白垩统油砂含油性特征  

Oil-Bearing Characteristics of Upper Cretaceous Oil Sands in the Dagang Area,South-Central Part of Western Slope of Songliao Basin

作　　者：仝立华 单玄龙[3] 张家强[1] 李锋 石磊 李耀华 徐银波 刘衍彤 Tong Lihua;Shan Xuanlong;Zhang Jiaqiang;Li Feng;Shi Lei;Li Yaohua;Xu Yinbo;Liu Yantong(Oil&Gas Survey Center,China Geological Survey,Beijing 100083,China;Key Laboratory of Unconventional Petroleum Geology,China Geological Survey,Beijing 100083,China;College of Earth Sciences,Jilin University,Changchun 130061,China;Xinjiang Xinyitong Petroleum Technology Co.,Karamay 834000,Xinjiang,China)

机构地区：[1]中国地质调查局油气资源调查中心,北京100083 [2]中国地质调查局非常规油气地质重点实验室,北京100083 [3]吉林大学地球科学学院,长春130061 [4]新疆新易通石油科技有限公司,新疆克拉玛依834000

出　　处：《吉林大学学报(地球科学版)》2025年第2期363-374,共12页Journal of Jilin University:Earth Science Edition

基　　金：中国地质调查局项目(DD20189606,DD20160188,DD20230751)。

摘　　要：松辽盆地西部斜坡带是中国重要的油砂成矿带,为了进一步厘清该区中南部白垩系油砂资源特征,开展了基础地质调查工作,并在吉林大岗地区布设了5口油砂调查井和1口水文观测井,通过岩心观察、地球物理测井解释、岩心样品含油率测试等方法开展地质综合研究。结果表明:该区白垩系姚家组油砂赋存深度为175~208 m,岩性以粉砂岩和细砂岩为主,最大含油率为16.02%,平均含油率为8.23%。油砂层测井曲线具低自然伽马、高声波时差、中高电阻率和低密度的特征。自上而下对油砂地层划分了4个小层(S1、S2、S3、S4)并开展含油特征分析,纵向上,油砂含油性表现为非均质性,且具有随深度增大含油率逐渐增高的特征,位于储层下部的S3和S4小层平均含油率分别为10.80%和11.40%,达到富矿品位。各小层有效厚度变化较大,最大单层有效厚度为3.10 m,最小单层有效厚度为1.20 m,下部的S3和S4小层的平均有效厚度分别为2.90 m和1.90 m,明显优于上部的S1和S2小层。在油砂发育规模上:S3小层分布面积最大,有效厚度≥2 m的砂体面积约为270 m×160 m,厚度中心位于井区东南,自厚度中心向北西方向厚度有所减薄;S4小层分布面积次之,有效厚度≥2 m的砂体面积约250 m×120 m,厚度中心位于井区中部,平面上呈东南和西北方向分布面积大、中间略小的近哑铃状,自厚度中心向北东和南西方向厚度有所减薄。砂体沉积特征受区域浅水三角洲沉积演化过程控制,高品质油砂多赋存于分流河道的细砂岩中,特别是位于下部的S3和S4小层具明显的多期叠置河道侧积砂体的沉积形态。总体而言,位于储层下部的S3和S4小层表现为高含油率、有效厚度大、展布面积可观的油砂赋存特征,是该区高品质油砂的主力储层。The western slope of Songliao basin is an important oil sands metallogenic belt in China.In order to further clarify the characteristics of Cretaceous oil sands resources in the central and southern parts of the area,the basic geological survey work has been implemented with five oil sands investigation wells and one hydrological investigation well in the Dagang area of Jilin.Based on core observation,geophysical log interpretation,and oil content test of core samples,a comprehensive geological study was carried out.The results show that,the oil sands of the Cretaceous Yaojia Formation are located at a depth from 175 m to 208 m,and the lithology is mainly siltstone and fine sandstone.The oil content level of the core reaches oil immersion grade,with a maximum oil content of 16.02%and an average oil content of 8.23%.The oil sand formation logging curve is characterized by low natural gamma value,high acoustic velocity value,medium to high resistivity and low density.The oil sands formation is divided into four sub-layers(S1,S2,S3,S4)and oil content characteristics are analyzed.Vertically,the oil content is non-homogeneous and increases gradually with depth.The average oil content of S3 and S4 in the lower part of the reservoir is 10.80%and 11.40%,respectively,reaching the grade of rich ore.The effective thickness of each sub-layer varies widely in the vertical direction,with a maximum value of 3.10 m and a minimum value of 1.20 m.The average effective thickness of the lower S3 and S4 sub-layers is 2.90 m and 1.90 m respectively,which is obviously better than the upper S1 and S2 sub-layers.On the scale of oil-sand development,the distribution area of S3 sub-layer is the largest,and the area of sand body with effective thickness≥2 m is about 270 m×160 m,and the thickness center is located in the southeast of the well area,and the thickness is thinned from the thickness center to the northwest;The distribution area of S4 sub-layer is the second largest,and the area of sand body with effective thickness≥2 m is ab

关 键 词：油砂 含油性特征 松辽盆地 西部斜坡带 大岗地区 上白垩统 姚家组 

分 类 号：P611[天文地球—矿床学] P618.13[天文地球—地质学]