【作者】 徐磊；

【导师】 操应长；

【作者基本信息】 中国石油大学 ， 矿物学、岩石学、矿床学， 2008， 硕士

【摘要】 东营凹陷沙四下─孔一段研究和勘探程度相对较低。近年来,丰深2、丰深3等井相继发现了工业油气流,表明沙四下─孔一段地层具有巨大的勘探潜力。以层序地层学及沉积学理论为指导,综合运用地震、测井、录井、岩心及相关分析化验资料,系统建立了东营凹陷沙四下─孔一段层序地层格架。针对研究区沙四下─孔一段地层的沉积特点,尝试性运用测井曲线的小波变换方法进行层序地层界面的识别和层序地层单元的划分,其中红层地层选用声波时差曲线进行小波变换,膏盐岩地层采用自然伽马曲线进行小波变换。东营凹陷沙四下─孔一段地层可划分为五个三级层序,其中层序1、层序2及层序3对应于孔一段下、中、上亚段沉积,层序4及层序5对应于沙四下下部和沙四下上部沉积。在层序地层格架内,以探井资料的综合分析为基础,结合地震资料,系统探讨了研究区沙四下─孔一段地层的沉积相类型。东营凹陷沙四下─孔一段沉积时期主要发育了盐湖、近岸水下扇、洪水─漫湖、漫湖三角洲、漫湖滩坝、冲积扇、扇三角洲、三角洲及滨浅湖滩坝等沉积相。通过对膏盐岩的岩性特征、沉积构造特征、地球化学特征、相序特征、空间分布特征研究,结合该区古构造、古气候、古盐度等资料,对东营凹陷膏盐岩沉积控制因素、物质来源、形成环境进行了探讨。研究表明,膏盐岩沉积主要受控于气候,盐源主要是陆源,由周围凸起的寒武、奥陶系地层提供。随着盐湖由暂时性盐湖向常年性盐湖演化,膏盐岩形成环境由初期的“浅水蒸发”向后期的“深水蒸发”转化。在沉积相类型及沉积相特征研究的基础上,通过砂砾岩厚度及百分含量、岩石类型、岩石颜色及地震相等分析,得出各层序内沉积相平面展布及演化规律。更多还原

【Abstract】 The degree of research and exploration of lower the 4th Member of Shahejie Formation─the 1st Member of Kongdian Formation in Dongying depression is relatively low.In recent years the discovery of commercial oil and gas flow in fengshen3,fengshen2 as well as some others,demonstrate that great potential available in the lower part of the 4th Member of Shahejie Formation─the 1st Member of Kongdian Formation.Guided by sequence stratigraphy and sedimentology,based on the comprehensive application of seismic data,well logging data,drilling cores and other related analyzed data,the sequence stratigraphic framework of lower the 4th Member of Shahejie Formation─the 1st Member of Kongdian Formation in Dongying depression is built up. In view of the different characteristics of the formation,wavelet transfer was tentatively applied in the research to identify the sequence boundary and to divide the sequence stratigraphy units.Ac well logging wave is applied in the division of redbeds,Gr well logging wave is applied in the division of salt-gypsum rock.This paper divide lower the 4th Member of Shahejie Formation─the 1st Member of Kongdian Formation into 5 third-order sequences,of which sequence 1,2 and 3 correspond to lower,middle and upper parts of Member 1 of Kongdian Formation and sequence 4 and 5 correspond to the lower and upper part of the lower part of the 4th Member of Shahejie Formation.On the basis of the comprehensive analysis of the exploratory well data,along with the seismic data,the types and distribution of sedimentary systems of Dongying depression are studied within the vertical sequence.This paper argues that the main types of sedimentary facies in the lower part of the 4th Member of Shahejie Formation─the 1st Member of Kongdian Formation include salt lake,nearshore subaqueous fan, flood─overlake,overlakedelta,overlake─beach and bar system,alluvial fan,fan delta, delta,beach and bar systerm.The control factor,material source and formation environment are studied by the research of the lithologic characteristics,sedimentary tectonic characteristics,geochemical characteristics,profile characteristics and plane distribution characteristics as well as the analysis of palaeostructure,palaeoclimate and palaeosalinity of the area.The results show that the salts are continental source and come from the Cambrian and Ordovician systems of the surrounding uplifts.Along with the evolution of palaeolake,the depositional environment of salt-gypsum rock varies from“shallow water evaporate”to“deep water evaporate”.On the basis of the research on the types and characteristics of sedimentary facies,by the means of the thickness and percentage of glutenite ,colour and type of rock and seismic facies,the regular pattern of sedimentary facies in each of the sequence is obtained.更多还原