Single channel division within compound sand bodies and sedimentary evolution

The upper sub-member of He-8 is one of the main reservoirs in Sulige gas field, based on data analysis of outcrops, coring and dense well pattern, by applying the vertical separability identification method and the composite channel plane combination method, the compound sand bodies in the upper sub-member of He-8 in Sudong 27-36 dense well pattern area were analyzed and classified, there were 11 middle sized and 7 small sized distributary channels. Based on reasonable division of channel sand bodies, the main types of sedimentary microfacies in the study area are summarized as distributary channel, abandoned channel, crevasse channel, natural levee, excessive bank sand, crevasse splay, etc., The upper sub-member of He-8 is a water ingression process, the river type is changed from the braided river to meandering river, and the sand body is relatively developed.