摘要:
对于横向沉积为主的地层,三维地震资料在建立井间对比关系方面具有重要的作用。依据三维地震资料和钻井资料的综合解释,较好地确立了东营凹陷东部沙三中东营三角洲的高分辨率地层格架。东营三角洲沙三中层序是由沉积控制的等时地层单元,由下部较薄的加积单元和上部较厚的进积单元组成。通过对三角洲前缘中厚层泥岩的研究,高位体系域中可以识别出 6个准层序,每个准层序表现为前积叠置的、代表着一个或多个三角洲朵状体组成的层组。东营三角洲层序极不对称的垂向地层关系主要与在多级层序格架中的位置和控制层序及其体系域形成的主要因素—亦即沉积物供应量的变化有关,"敞流"湖盆的背景及相对稳定的缓坡构造活动条件扩大了沉积作用对地层结构的影响。同样,高位体系域形成时期高频的沉积物供应变化是准层序形成的主要原因。东营三角洲沙三中等时地层格架的探讨对古代湖盆三角洲的研究,及伴生的浊积岩岩性油气藏的预测、描述和勘探都具有重要的意义
Abstract:
Three-dimension seismic data pIay a significant roIe in the correIation of weII-data, especiaIIy when being used for studying progradationaI successions. According to integrated research of seismic and weII data, high-resoIution stratigraphic architecture of MiddIe-Shasan Dongying DeIta, Dongying sag, was weII estabIished. The seguence of MiddIe-Shasan Dongying DeIta is sedimentation-controIIed succession, consisting of thinner Iower aggradationaI section and thicker upper progradationaI section. Six paraseguences are distinguished from the progradationaI section by study on thick muddy Iayers of deItaic front, each of which behaves as progradationaI superposition of bedsets representing one or more deItaic Iinguiforms. VerticaI asymmetricaI structure of the seguence primariIy rests on both the position at the muIti-order seguence architecture, and the key factors formatting the seguence and its system tracts are changes in sediment suppIy. InfIuence of deposition to strataI frame is ampIified due to ancient open-Iake background and reIative tectonic tranguiIization of gentIe sIope of Dongying sag. The discussion on high-resoIution stratigraphic architecture wiII heIp investigation to ancient Iacustrine deIta and boost up prediction, description, oiI expIoration and expIoitation of accompanying IithoIogicaI reservoirs.
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