【摘要】 基于传统的层序地层学理论,利用岩心、露头、测井和地震等资料,开展S75区石炭系卡拉沙依组层序地层格架研究。识别出各类层序边界与层序内部的初始海泛面和最大海泛面,对准层序进行识别和划分,将卡拉沙依组划分为3个三级层序,识别出低位体系域、海侵体系域和高位体系域。由于受多期河道砂体相互切割叠加的影响,卡拉沙依组SQ2和SQ3层序水下分流河道砂体的连通性较好,特别是SQ2层序三角洲前缘沉积时期。Csq1层序的垂向上可发育多个冲刷面,主要砂体发育在潮间带的潮道中;Csq2层序低位体系域砂体主要发育在扇三角洲分流河道,Csq2层序海侵体系域砂体主要在潮道和砂泥混合坪中发育;Csq3层序砂体主要在潮间带的潮道中发育。从卡拉沙依组3个层序的砂体发育演化来看,T806K～TK842井一带、TK711～TK729井一带及S75～TK736一带是研究区砂体发育较集中的区域。更多还原

【Abstract】 Based on the traditional sequence stratigraphy theory,core,outcrop,well logging,seismic and other data were used,and the sequence stratigraphic framework study of Carboniferous Kalashayi Formation in S75 well area was carried out.The types of sequence boundaries,the first flooding surface and the maximum flooding surface were identified,the parasequence was identified and classified,Kalashayi Formation was divided into three third-order sequences,in which lowstand system tract,transgressive system tract and highstand system tract were identified.Due to the effect of multi-stage channel sand body cutting,the connectivity of the underwater distributary channel sand body in SQ2 and SQ3 sequences period is better,especially SQ2 delta front deposition period.The sand bodies in vertical direction of Csq1 sequence can develop some scour surfaces,the sand bodies are mainly developed in tidal channel of the intertidal.The sand bodies of Csq2 sequence lowstand system tract are mainly developed in fan delta branch river,the sand bodies of Csq2 sequence transgressive system tract are mainly developed in tidal channel sand and mud mixed flat.The sand bodies of Csq3 sequence are mainly developed in tidal channel of the intertidal zone.According to the sand bodies development and evolution of three sequences in Kalashayi Formation,T806K-TK842 well area,TK711-TK729 well area and S75-TK736 wells area are the sand bodies development concentration region.更多还原