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济阳坳陷新近系馆陶组普遍发育河流相的观念由来已久,这些认识束缚了对馆陶组下段的油气勘探。通过近期的勘探实践和深入研究,丰富和发展了原有孤岛油田馆陶组仅普遍发育河流相的沉积观点,认为馆陶组下段不仅发育砾质辫状河沉积,还发育辫状河三角洲—充填型浅水湖泊沉积体系。辫状河三角洲由三角洲平原、三角洲前缘和前三角洲组成,水下分流河道为三角洲前缘骨架砂体,河口坝和远砂坝不甚发育,前三角洲发育普遍较薄。该沉积体系的发现,展示了研究区浅层馆陶组下段良好的油气勘探前景。
The recent development of the Guantao Formation in the Jiyang Depression, which is characterized by a wide range of river phases, has restricted the exploration for oil and gas in the lower part of the Guantao Formation. Through the recent exploration practice and in-depth study, the existing Guantao Formation in Gudao Formation of the former Gudao Oilfield only developed the depositional view of the river facies. It is believed that the lower part of the Guantao Formation not only develops gravel braided river sediments but also braided river delta- Filling shallow lake depositional system. Braided delta consists of delta plain, delta front and front delta. The underwater distributary channel is delta front sand body. The estuarine bar and distal barrage are not well developed, and the development of the former delta is generally thin. The discovery of this sedimentary system shows the good prospect of oil and gas exploration in the lower Guantao Formation in the study area.