关键词: 松辽盆地, 营城组, 地层序列, 地层对比

Abstract: Stratigraphical correlation is performed on 20 cross and drilling sections at the southeastern margin of the Songliao Basin and in the Xujiaweizi faulted depression. The Yingcheng Formation could be divided into five lithologic members and considering that member 1- member 4 have been in usage in the Xujiaweizi faulted depression, the author have termed the five lithologic members as: lower member (K₁y^low), member 1 (K₁y¹), member 2 (K₁y²), member 3 (K₁y³) and member 4 (K₁y⁴), in order not to cause more confusion. The lower member consists mostly of andesite basalt, andesite, andesite tuffaceous with conglomerate, sandstone, siltstone and mudstone as interlayers, with Yingcheng 343 drilling hole profile as its standard section. Rhyolite, perlite and rhyolite volcaniclastic rocks dominate in member 1. Member 2 is mostly of clastic rocks, including conglomerate, sandstone, siltstone, mudstone with tuff as interlayers in the lower part and rhyolitic volcaniclastic rocks at the top of the member. Member 3 is composed of basalt, basaltic tuffaceous rocks at the lower and middle parts while at the top of the member of intebedding of the intermediate with acidic volcanic rocks. Xieweibagou-Guanmashan-Tuanjie crosssection can be selected as the standard section of member 1, member 2 and member 3. Member 4 consists mostly of conglomerate, samdwiched in sandstone and mudstone, with the Xushen 1 drilling hole profile as its standard section. Member 4 only exists in the Xujiaweizi faulted depression.

Key words: Songliao Basin, Yingcheng Formation, stratigraphical sequence, stratigraphical correlation