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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 is located in the northern part of Huanghua Depression, close to Cangxian uplift and Yanshan fold belt. The origin of sand body and terrigenous debris supply area have been the focus of debate. Focusing on this focal point, the direction of provenance was pointed out by analyzing the combination of light and heavy minerals in the two sedimentary systems in the west and north. The sequence characteristics of the fan delta and the gravity flow sequence were discussed respectively. Based on the study of grain size distribution, distribution characteristics of sand bodies and sedimentary evolution, this paper puts forward a new view on the genetic type of sand body. It is concluded that the sand body belongs to fan delta and slump gravity flow deposition, Flowing sand body is the key target of exploration in this area in the future.