陆相坳陷盆地层序地层格架下岩性地层圈闭/油藏类型与分布规律——以松辽盆地白垩系泉头组—嫩江组为例

本文在圈闭组成和形成条件分析的基础上对坳陷盆地层序地层格架下岩性地层圈闭/油藏类型与分布规律进行了初步分析和总结,探讨了层序地层格架下不同体系域中圈闭/油藏类型的纵向分布、盆地中不同构造部位圈闭/油藏类型的横向分布规律。系统解剖了松辽坳陷盆地白垩系二级层序格架内低位、湖侵和高位体系域中圈闭/油藏类型的纵向分布和变化特征;对比分析了坳陷盆地从凹陷带(近凹中心)、过渡带(凹陷边缘)到斜坡带(环凹斜坡)圈闭/油藏类型的横向分布和变化规律。圈闭/油藏类型的纵、横向分布和变化规律表明:岩性地层圈闭/油藏的形成及类型具有纵向“层控”、横向“相控”的规律性,即纵向上受控于层序格架(体系域),横向上受控于一定构造背景下特定的沉积相带。     

西藏普兰石炭纪地层的厘定及其地质意义

通过区域地质调查,利用确定上覆、下伏地层时代与区域地层对比方法,结合邻区古生物年代特征,对西藏普兰北喜马拉雅分区下石炭统进行了厘定。普兰地区早石炭世受沉积环境与物质供应量等因素影响,岩性、岩石组合特征与邻区略有差异,其下部以变质粉晶灰岩为主夹变质泥质粉砂岩,厘定为亚里组;上部以变质细粒砂岩为主夹变质粉晶灰岩,厘定为纳兴组。     

黑龙江省东部鸡西群与龙爪沟群综合地层对比研究

利用最新古生物、磁性地层年代学资料对鸡西群、龙爪沟群进行了年代地层划分．确定了两群形成时间为早白垩世凡兰吟期-阿尔布中期。同时采用层序地层、盆地形成动力学、事件地层学、盆地湖（海）平面升降曲线与全球海平面升降曲线对比等方法．对两群进行了综合对比．证实两群为同一构造-沉降旋回背景下的等时异相关系。笔者认为龙爪沟群自下而上划分为4个组，即裴德组、七虎林河组、下云山组、朝阳组，其在横向上分别对应鸡西群滴道组、城子河组、穆棱组、东山组。这一研究结果将对进一步讨论黑龙江东部中生代海陆变迁机制、地层、构造格架建立及煤矿预测等具有重要的指示意义。     

大庆探区外围盆地中、新生代地层对比及四大勘探层系

大庆外围盆地的区域对比与组合规律研究,对于揭示东北中、新生代盆地演化规律和拓展油气开发思路具有重要意义.利用岩性特征、古生物化石组合、同位素等资料,对大庆探区外围盆地中、新生代地层进行了对比,总结了地层发育的宏观规律,提出了中-上侏罗统、下白垩统、上白垩统和古近系四大勘探层系,为大庆探区外围盆地进一步的沉积、构造演化及石油地质研究提供了可靠的依据.     

鲁北济阳坳陷东营凹陷南坡沙河街组第四段上亚段高分辨率层序地层格架

应用高分辨率层序地层学与沉积学等理论,通过对地震、录井、测井资料的分析,对鲁北东营凹陷南坡沙河街组第四段上亚段进行了高分辨率层序地层学的划分与对比,总结出各层序地层单元及其界面在录井和地震资料中的判识标志,把研究区基准面旋回划分为短期、中期和长期3个级别的旋回层序.整个沙河街组第四段上亚段由一个长期基准面旋回组成,并划分出5个中期基准面旋回,首次建立了研究区内该亚段高分辨率层序地层格架,有利于东营凹陷南坡该亚段沉积微相和储层结构描述等精细地质研究的进一步开展.     

Changing lake dynamics and sequence stratigraphy of synrift lacustrine strata in a half-graben: an example from the Triassic Ischigualasto–Villa Unión Basin, Argentina

Well‐exposed Triassic rift strata from the Ischigualasto–Villa Unión Basin (NW Argentina) include a 80 to ca 515 m thick lacustrine‐dominated package that can be correlated across a half‐graben using key stratigraphic surfaces (sequence boundaries, lacustrine flooding surfaces and forced regressive surfaces). The characteristics of the synrift lacustrine fill in different parts of the half‐graben have been examined and the mechanisms controlling sedimentation inferred. A variety of sedimentary environments are recognized including; volcaniclastic floodplain, mildly saline lake and playa lake, offshore lacustrine, delta front to fluvial‐dominated and wave‐dominated deltas, distributary and fluvial channel, and interdistributary bay. The succession can be divided into four stratigraphic sequences (SS1 to SS4), the oldest of which (SS1) contains volcaniclastic, fluvial and saline lake deposits; it is thickest close to the western border fault zone, reflecting more rapid subsidence here. Accommodation exceeded sediment and water input during SS1. The second and third sequences (SS2 and SS3) mark the onset of widespread lacustrine sedimentation, reflecting a balance between accommodation creation and water and sediment fluxes. Sequences SS2 and SS3 are represented by offshore meromictic lacustrine and deltaic deposits, the latter mostly sourced from the flexural and southern axial margins of the half‐graben. The presence of stacked parasequences bound by lacustrine flooding surfaces is related to climatically induced lake‐level fluctuations superimposed on variable rates of subsidence on the controlling rift border fault zone. The youngest sequence (SS4) is represented by the deposits of littoral lacustrine and shallow shelf deltas distinguished by a change in lithofacies, palaeocurrents and sandstone composition, suggesting a switch in sediment supply to the footwall margin to the NW. The change in the sediment source is related to reduced footwall uplift, the possible presence of a relay ramp and/or supply from a captured antecedent drainage network. During SS4, the rate of creation of accommodation was exceeded by the sediment and water discharge. The stratigraphic evolution of lacustrine strata in the half‐graben was mainly controlled by tectonic processes, including subsidence rate and the growth and evolution of the border fault zone, but changing climate (inducing changes in water balance and lake level) and autocyclic processes (delta lobe switching) were also important.     

沉积波动过程分析在地层层序分析中的应用--以塔里木盆地为例

沉积波动过程是地壳波状运动的具体表现,它是各种天文因素、地质因素共同作用的结果,沉积波动过程的时空演化控制着地层层序的时空展布特点。在介绍沉积波动过程分析概念、技术思路、工作方法的基础上,利用沉积波动曲线在剖面上的预测功能及对沉积－剥蚀过程起止时间、不整合的研究成果,分析了塔里木盆地震旦系至第四系各主要构造层的地层展布特征,并对其形成过程及成因进行了分析,在理论和方法研究方面,试图将沉积波动特征的研究与层序地层学的研究结合起来,提出了地层格架－沉积波动特征连井对比图的概念和编制方法,该类图件能直观地反映多期不整合的存在及不整合间断的时间,并能直观地反映各层序的时空分布,而且能够解释地层格架的形成过程,进而进行成因分析,是沉积波动过程分析方法与层序地层学结合的一种具体、有益的偿试。     

泌阳断陷双河—赵凹地区陆相层序地层学模式

以泌207井作为参照井,本区下第三系核三段上部所划3个陆相层序发育Ⅰ型层序界面一个,Ⅱ型层序界面3个。一个完整的Ⅰ型陆相层序自下而上发育有低位体系域(LST)、水进体系域(TST)、早期高位体系域(EHST)及晚期高位体系域(LHST)等4个体系域,共5个界面。除顶、底界面归属层序界面之外,其它3个界面皆为体系域界面;而Ⅱ型陆相层序缺失LST.无论何种体系域,其沉积体的几何形状均为楔状体,且各体系域的沉积相横向配置呈现规律性变化。等时层序地层框架模式清楚地显示了泌阳断陷成盆演化史、沉积充填史及其陆相层序时空展布特征。     

巢湖地区石炭纪地层格架

巢湖一带石炭纪地层可划分为４～５级的高频振荡旋回,可鉴别重要沉积间断面３个,揭示３级旋回层序的规律性,据此,建立巢湖一带石炭纪的地层格架,探讨巢湖地区石炭纪海平面相对升降变化规律。