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1.
北黄海盆地地质构造特征及其演化 总被引：3，自引：0，他引：3
北黄海地区是我国研究程度最低的海区,各种情况表明,本区油气前景乐观。为了弄清北黄海盆地地质构造特征及其演化,在前人研究成果基础上,对北黄海盆地原有二维地震资料和重磁资料进行了重新处理和解释。资料处理采用了地震多次波压制技术、精细速度谱分析、位场延拓、小波多尺度分析、区域场和剩余场分解、方向导数分析以及重震联合反演等多种处理技术,对地球物理资料进行了综合解释。北黄海盆地结晶基底北低南高。褶皱基底呈NE向格局,埋深起伏变化较大。盆地主要发育NE向和NW向两组断裂。盆地被两条NE向的边界断裂所控制。NW向断裂是盆地内的次级断裂,控制了盆地内坳陷和隆起的分布范围和形态,使北黄海盆地形成三坳两隆的构造体系。规模较小的NE向3级断裂分布在坳陷内部,将坳陷分为不同规模的局部凹陷和局部隆起。火成岩主要分布在西部隆起带的南端和南部隆起带上,火成岩对坳陷内部影响不大。 相似文献
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《海洋地质与第四纪地质》2015,(4)
北黄海盆地是中国东部勘探及研究程度较低的含油气盆地之一,多期构造活动伴生形成的大量火成岩进一步增加了北黄海盆地油气勘探工作深入的难度。为了掌握北黄海盆地某区块火成岩的空间分布特征,利用盆地近年最新采集处理的某区块三维地震资料,通过区内钻测井资料综合分析建立特有火成岩岩石物理模型,运用双参数约束三维地震叠前同时反演技术对研究区的火成岩分布进行预测。结果显示利用纵波阻抗和纵横波速度比双参数联合约束的地震叠前同时反演技术,可以对区内的火成岩进行较为有效的刻画,分析认为北黄海盆地某区块内火成岩由多期形成,中深部的火成岩主要以岩株、岩墙或岩脉状为主,具有规模小、分布广的特点。 相似文献
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东海陆架盆地发育在中生代晚期古太平洋板块俯冲背景下,是中国近海面积最大的中、新生代沉积盆地,目前的油气发现均来自于新生界,而中生界的分布特征及其资源潜力尚缺乏足够的认识。前人研究表明,东海陆架盆地西部坳陷带的中生界遭到后期不同程度的构造抬升和剥蚀,总体表现为残留盆地的分布特征;而东部坳陷带的中生界缺乏钻井直接揭示,受制于中深层地震的资料品质,识别难度较大。本文从东海陆架盆地西部坳陷带钻遇中生界的井震标定出发,通过区域地震剖面的中生界地震相分类和识别,划分了中生界侏罗系和白垩系的构造层序格架,梳理了中生界残留盆地的结构和平面分布特征,并结合基本石油地质条件分析,认为东海陆架盆地中生界具有不可忽视的勘探潜力。 相似文献
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《海洋地质与第四纪地质》2010,(3)
西部坳陷位于北黄海盆地西部,是盆地6个彼此分割的二级构造单元之一。从实际地震资料出发,结合区域地质及盆地东部钻井资料,运用地震地层学、层序地层学等方法,对西部坳陷的地层发育及分布特征、沉积环境及沉积相等进行了初步分析,认为本坳陷具东西双断的三层结构特征,发育上侏罗统、下白垩统、始新统、渐新统、新近系等地层,中新生代沉积巨厚,最厚达10 200 m,以河—湖—三角洲等陆相沉积为主,具有较好的油气条件及资源前景。 相似文献
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二叠系烃源岩是南黄海盆地多套优质烃源岩之一,多年来,由于地震测线少和品质差,导致对其分布一直认识不清。基于南黄海盆地近年来新采集处理的大量二维地震测线,结合老地震测线和5口钻遇二叠系的钻测井资料,通过单井相分析、地震-沉积相分析,开展了对南黄海下二叠统、上二叠统的沉积相及有利烃源岩分布预测研究。分析表明:下二叠统栖霞组沉积时期,青岛坳陷及崂山隆起西部以台地相为主、中东部以盆地相发育为主;上二叠统龙潭组沉积时期,青岛坳陷南部和勿南沙隆起以三角洲平原相、崂山隆起和青岛坳陷西部以三角洲前缘沉积相、青岛坳陷东北部及崂山隆起东部以滨浅海沉积相发育为主。结合有利烃源岩沉积相和残留地层厚度分析,认为崂山隆起中部及青岛坳陷东北部是下二叠统烃源岩有利分布区,崂山隆起中东部及青岛坳陷东北部是上二叠统烃源岩有利分布区。 相似文献
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北黄海盆地东部M隆起构造特征及演化 总被引：1，自引：0，他引：1
《海洋地质与第四纪地质》2016,(5)
北黄海盆地是中国东部近海中生代断陷型盆地,详细记载着中国东部复杂的构造活动信息,期间经历了多期岩浆活动和构造反转。M隆起位于北黄海盆地东部,其构造活动记录比周边的坳陷更为详细。为充分认识M隆起的地质结构及沉积响应关系,在充分利用地震、钻测井等资料的基础上,结合区域构造背景,从构造运动学和动力学等方面探讨分析其构造演化历程,进而为北黄海盆地乃至中国东部地区的构造演化提供新的依据。高精度三维地震资料及地质分析揭示,该隆起区发育有5个典型的不整合面,纵向上可划分为5个构造层。结合北黄海盆地所处构造位置、构造变形和沉积充填特征,及板块运动和区域构造演化史,将北黄海盆地东部M隆起自中侏罗世至今的构造演化划分为5个阶段(共9期):裂陷阶段(稳定沉积期、掀斜形成期、早白垩世凹陷沉积期)、构造反转阶段(晚白垩世抬升剥蚀期)、再次裂陷阶段(早渐新世初沉积期、早渐新世末剥蚀期、F2断层活跃期)、再次构造反转阶段(整体抬升期)、区域沉降阶段(区域沉降期)。 相似文献
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《海洋地质与第四纪地质》2015,(5)
充分利用钻井岩心观察、薄片鉴定、扫描电镜和能谱分析等多种技术手段,分析了储层的岩石学特征,探讨了热液作用对储层的影响。研究认为,北黄海盆地东部坳陷中生界储层溶蚀缝洞大量充填与热液活动相关的自生矿物,热液作用对砂岩储层主要起破坏性作用。分析发现,北黄海盆地中生界具有热异常以及与岩浆作用有关的热力作用条件,发育与岩浆相关的热液活动地质背景;热液作用的发育纵向上具有层位性,主要位于上侏罗统顶部,平面分布则多与断裂发育有密切关系。 相似文献
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为了预测南黄海盆地油气远景,利用最新采集的383个站位的低层大气烃类检测数据进行评价。烃类检测结果为:高值甲烷异常区主要分布在南黄海北部坳陷西南,次高值甲烷异常区主要分布在中部隆起带西部和南部坳陷中部,而南北向带状分布的甲烷异常带位于南黄海的东部。结合南黄海盆地航磁异常和部分浅地层剖面资料,认为中部隆起带东侧及紧邻的北部坳陷西南具有较好的油气远景。 相似文献
9.
北黄海盆地东部坳陷构造演化与油气地质特征 总被引：1，自引：0，他引：1
北黄海盆地是我国近海海域惟一没有形成工业油气流的含油气盆地,东部坳陷是北黄海盆地勘探潜力最好的一个区域,该坳陷的油气地质特征和勘探方向研究成为实现这一盆地油气勘探突破的关键。通过对已取得的勘探成果和现有资料的综合研究,指出东部坳陷存在三套生、储、盖组合,其中下白垩统生、储、盖组合最具勘探潜力。 相似文献
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临南洼陷带沙四段滨浅湖滩坝相成因的砂体广泛发育,近年来已成为该区十分重要的勘探后备阵地。但该区火成岩发育,地震资料品质较差,滩坝砂的分布发育不清,不利于勘探部署。在深化研究沙四上亚段古地貌、沉积特征的基础上,运用频谱分解等技术提高地震资料分辩率,综合利用了正演及属性分析等技术,对滩坝砂岩的发育范围进行了预测,取得了良好的效果,为该层系油藏的勘探提供了可靠的依据。 相似文献
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东海陆架盆地及其邻域岩浆岩时空分布特征 总被引：6，自引：0，他引：6
基于二维地震资料和重磁资料的处理、解释,研究了东海陆架盆地及其邻域岩浆岩时空分布特征,并收集整理浙闽地区相关地质资料,将海陆连为一体进行综合解释。浙闽陆区岩浆岩非常发育,并且大致沿28°N为界,北侧岩浆岩大体呈NE向带状分布,南侧则呈NNE向带状分布,且埋深较浅,甚至在有些地区出露地表,其分布特征受区内大断裂的控制。综合地震、重磁资料研究认为,海域岩浆岩多分布在隆起部位或凹陷的边缘位置,发育情况与断裂的展布密切相关。收集整理了海域钻遇岩浆岩的15口钻井资料,沿自SW至NE一线,对岩浆岩的同位素年龄进行了统计分析,并结合其侵入关系对岩浆活动进行了期次和展布特征的划分,初步划分为4期:燕山期、四川期、华北期和喜马拉雅期;4带:浙闽隆起区、中部隆起区、钓鱼岛隆褶带和琉球岛弧带。 相似文献
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Deniz Cukur Senay Horozal Dae C. Kim Gwang H. Lee Hyun C. Han Moo H. Kang 《Marine Geophysical Researches》2010,31(4):299-313
This paper presents results of two-dimensional seismic mapping of the northern East China Sea Shelf Basin. Various igneous
features such as sills, volcanic edifices and stocks were identified by the geophysical exploration. The sills are most common,
and are observed at more than 90 locations. Most mapped sills in the study area are characterized by high-amplitude continuous
reflections with distinct terminations. Saucer- and cup-shaped sills are observed locally. The stocks are discordant (nearly
vertical) igneous bodies and they are characterized by seismic transparency, with upturned host rocks and uplifted overburden.
The volcanic edifices and/or necks consist of irregular mounds and peaks and are characterized by strong positive top reflections
with chaotic internal facies. The oldest igneous activity in the northern East China Sea Shelf Basin is Early Cretaceous (123.3 ± 3.7).
This igneous activity coincides with those observed in eastern China which has been related mainly to the subduction of the
Pacific Plate beneath Eurasia Plate. The Miocene igneous activity is well constrained based on seismic stratigraphic relationships
within the folded stratigraphy, age dating, and the occurrence of igneous sills. The timing of this intrusion is coincident
with the intensive igneous activity as previously suggested for the eastern China. Igneous rocks can produce hydrocarbon traps,
reservoirs and they can act as a seal, and therefore are of great importance in petroleum study. 相似文献
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根据地震反射特征、古生物组合、湖水面变化及构造变动，应用层序地层学原理，对下第三系进行层序划分，分析了地震相类型，总结出主要的沉积体系特征及其展布规律 相似文献
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浅层地震声学剖面的声地层学解释 总被引：5，自引：2，他引：5
潘国富 《海洋地质与第四纪地质》1991,11(1):93-104
浅层地震声学剖面测量是用声波探测水深和海底沉积物分层结构的技术方法,并采用声地层学方法来进行浅层地震声学剖面解释.通过对东海某区的剖面海底浅层沉积物有效地解释和研究,具有良好的应用前景. 相似文献
17.
Solomon Assefa Clive Mc Cann Jeremy Sothcott 《Marine Georesources & Geotechnology》2013,31(2):119-140
Abstract There are few published seismic (P- and S-waves) properties for seafloor bedrocks. At low pressures (1 to 10 MPa), velocities and attenuations are determined mainly by open microcracks. At higher pressures, the microcracks close, and the velocities and attenuations depend primarily on the matrix porosity. We have investigated both the relationships between the acoustic, petrophysical, and geological properties of the rocks at 40 MPa pressure and the effect of microcracks on the acoustic properties at 10 MPa pressure. In this paper we discuss the former; the latter will be discussed separately. P- and S-wave velocity and attenuation measurements were carried out on a suite of seabed sedimentary and igneous rocks at effective pressures from 10 to 40 MPa at ultrasonic frequencies. The porosities and permeabilities of the rocks ranged from 0% to 32% and 0 to 110 mDarcy, respectively. Characterization of the rocks revealed that most of the sandstones have a substantial clay content (kaolinite, illite, and chlorite) and fractures. Most of the igneous rocks are chloritized. The seismic properties of the rocks are markedly lower than those of similar continental rocks because of the microporosity formed by the alteration of feldspars, micas, and mafic minerals to clays (e.g., chloritization of pyroxenes) and the corresponding reduction of the elastic moduli. The results of this study suggest that the values of velocities and quality factors used for ocean acoustic propagation models are lower than normally assumed. 相似文献
18.
南海北部深水区新生代岩浆岩分布规律及其与海底地质灾害的相关性 总被引：2，自引：1，他引：1
前人对南海北部新生代陆缘盆地结构、构造样式和期次等做了大量的研究工作,但对于具体体现内动力过程的岩浆活动关注较少,尤其是北部深水区的研究鲜有涉及。本文基于二维地震剖面的解译分析,将南海北部新生代岩浆岩划分为3个集中分布区:琼东南-西沙区、神狐区和东沙区。各区域岩浆岩的产出状态有所差异,其中琼东南-西沙区岩浆岩的平面展布规律性极强,主要受右行右阶的走滑断裂控制;神狐区岩浆岩位于NW向与NE向断裂的交汇处,侵位空间受先存断裂制约;东沙区岩浆岩的产生与东沙运动期间区域伸展过程有直接关系。作为内动力的表征,岩浆作用对于海底地形地貌具有重要的改造作用,与活动断裂、海底滑坡、浅层气等海底地质灾害也具有成因上的关联。 相似文献
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During deposition in the Palaeogene, the Pearl River Mouth Basin (Enping Sag) was filled by sediments derived from northern and southern source regions. The northern sources are the fold belt Caledonian and Hercynian metamorphic rocks that are widely exposed along the South China block and stacked with Mesozoic igneous rocks, and the southern sources are Mesozoic igneous rocks from the southern Panyu lower uplift. We analysed the characteristics of the provenance and sediment-dispersal patterns of the beach and bar systems in the Palaeogene third-order sequence framework on the basis of detritus, thin section, zircon and the geophysical response test data. The source and deposition areas were distinguished based on their palaeogeomorphology. The sedimentary material composition of the deposition area was determined based on the characteristics of the detrital assemblage and cathode luminescence, and the characteristics of the age distribution were determined in detail using detrital zircon U–Pb dating. This study suggests that the provenance system in the Palaeogene mainly consisted of Palaeozoic metamorphic rocks and Mesozoic igneous rocks, with a supplement of Proterozoic metamorphic rocks. The transport capacity of three large fault troughs that delivered the northern provenances gradually increased from the Wenchang Formation (E2w) to the Enping Formation (E3e), whereas the southern provenances were transported by four or five incised valleys in E2w and then submerged in E3e. In the 3D seismic area, the features of the beach and bar sedimentary systems were described and interpreted based an analysis of the well-based sedimentary facies, seismic reflection characteristics and multiple attribute clustering. The results show that the beach and bar systems by the short-axis braided deltas mainly developed in the upper member of E2w and that the beach and bar systems on the subaqueous high in E3e developed during the Palaeogene. In addition, the bedrock-beach bar sedimentary system in the lower member (E3eL) was transferred to the braided delta–beach bar sedimentary system in the upper member (E3eU). 相似文献