徐家围子断陷营城组四段沉积相研究

松辽盆地北部徐家围子断陷白垩系营城组砂砾岩是深层天然气勘探的主要目标层位。通过对营四段取芯井的岩芯观察,测井相和地震相分析,将营城组四段划分出两个三级层序,即营四下层序和营四上层序。营四段下层序属于多物源,其主要的沉积物多来自断陷四周的凸起,主要发育扇三角洲以及湖泊两种沉积相;而营四段上部地层南北向物源是主物源,北西和西南物源是次要物源,主要发育辫状河,辫状三角洲体系,扇三角洲沉积体系。

The Reserch on Sadimentary Facies of the Member 4 of Yingcheng Formation in Xujiaweiai Deoression

The matrix lithology of tight sandstone/gravel reservoirs at the member 4 of Yingcheng formation of Xujiaweizi in Songliao basin is main target stratum of deep gas prospectingThe member 4 of Yingcheng formation can be divided into the upper and the lower of the member 4 of yingcheng By the analysis of observation well-cores,logging and seismic facies.the lower sequence belongs to many source.The major sediments of it come from the convex around the graden basin .It is dominated by the depositional system of...