There are rather complex sedimentary build and poor reservoir sedimentary facies studies in Huoshiling Formation horizons of East Block of Changling Oil and Gasfield developed during the rifting period of Songliao Basin. Based on the comprehensive studies of the drilled cores, well logs, seismic data and so forth, the detailed classification of Member-1 sedimentary facieses of Huoshiling Formation of the block is conducted. The studies show that three kinds of sedimentary facieses; fan delta, underwater fan and lacustrine facies, with mainly fan delta are developed in Member-1 of the Formation of the study area. And furthermore six kinds of sedimentary sub-facieses are divided, among them the former is .the most important one. In the plane, the facieses spreads nearly north-south. The underwater fan is deposited in the early period of the north, and then gradually transformed into fan delta deposition, finally the sources of the matter are disappeared in the late period; on the contrary, in the south, there is no the source in the early period, in the end the fan delta deposition appears and then continuously extends to the end period of Member-1 of Huoshiling Formation.%长岭油气田东断块火石岭组地层发育于松辽盆地断陷期,沉积建造复杂,沉积相(储层)研究薄弱.通过对钻井岩心、测井和地震等资料的综合分析,对长岭油气田东断块火石岭组一段的沉积相进行了详细划分.认为研究区火石岭组一段发育扇三角洲、水下扇和湖泊3种沉积相类型,划分出6种沉积亚相,其中最主要的为扇三角洲相.在平面上,沉积相呈近南北展布,北部早期为水下扇沉积,逐渐转变为扇三角洲沉积,晚期物源消失;南部早期没有物源,后期出现扇三角洲沉积,持续到火石岭组一段末期.
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