北塘地区沙三段储集层沉积相研究

Sedimentary facies study of the third member of Shahejie formation reservoir in Beitang region

北塘地区位于黄骅坳陷北部,靠近沧县隆起和燕山褶皱带两大物源供给区,砂体成因及陆源碎屑供给区一直是争论的焦点。围绕该焦点问题,通过分析西、北两大沉积体系轻、重矿物的组合特点指出了物源方向;对扇三角洲层序特征、滑塌重力流层序特征分别进行了讨论,确定了该地区的沉积层序特征;利用粒度分析、砂体分布特征以及沉积演化的研究对砂体成因类型提出了新的看法,认为该区砂体属扇三角洲和滑塌重力流沉积,同时指出滑塌重力流砂体是今后该区域勘探的重点对象。

Beitang region lies in the north of Huanghua depression,it is close to two big provenance-supply regions of Cangxian uplift and Yanshan fold belt,the sandbody geneses and terrigenous debris are continuously the disputed focus. Surrounding this problem,through analyzing the combination features of light and heavy minerals of northern and western sedimentary systems,the authors pointed out the provenance direction,respectively discussed the features of fan-delta sedimentary sequence and slumping and gravity flowing,and determined sedimentary sequence characteristics of this region. Using the study of granular analyses,the characteristics of sandbody distribution and sedimentary evolvement,the authors put forward the new views for types of sandbody geneses,considered this region's sandbody belonged to fan-delta and slumping gravity flowing sedimentation,and also pointed out that slumping gravity flowing sandbody would be the major object for this region exploration.