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1.
砂砾岩体是断陷盆地陡坡带主要的油气储集体。结合地震、测井、录井、岩心、镜下薄片、粒度分析、孔渗化验等资料,对山东省东营市盐家油田永921-920区块沙四上亚段砂砾岩体的沉积特征、成因机制及储层特征进行了研究。结果表明,该区块砂砾岩体受控于北部边界断裂控制的近岸水下扇,岩石结构成熟度与成分成熟度均低,粒度概率曲线发育缓慢上拱形与低斜两段式以及块状层理、反粒序层理、鲍马序列(Ta,Tb,Td段)、截切构造、泥岩撕裂屑、滑塌揉皱变形层理等均反映了重力流沉积特点,同时也可见槽状交错层理、平行层理、沙纹层理及水平层理等反映牵引流的沉积构造;识别出4期砂砾岩扇体,早期叠置连片,晚期孤立分散,呈退积型沉积复合体,第Ⅰ、Ⅱ及Ⅲ期上部砂砾岩体储层质量较好,其中扇中辫状水道物性最好,扇中前缘与内扇主水道物性相对较差。 相似文献
2.
南大港构造带下降盘沙河街组沙三段岩石类型为砾岩、砂岩、粉砂岩及泥岩组合。岩心中发育块状构造、交错层理、变形层理等重力流和牵引流沉积构造,炭屑、植物茎干、同生断层、泥质砂岩团块等现象也常见。粒度概率累计曲线为一段式和二段式,测井曲线可分为箱形、钟形、漏斗形和平直形4类。地震剖面上也可识别出水下扇的反射特征。综合岩性、粒度、电性和地震反射特征,明确了南大港构造带发育水下扇沉积,并可进一步分为内扇主水道、中扇分支水道、中扇水道间、水道前端朵叶体、水下天然堤及决口扇6种微相。自沙河街组沙三段沉积开始,南大港断层活动强烈,在五断块形成了远源水下扇;而在歧南9X1断块发育近源水下扇。两种类型的水下扇在物源、岩性、电性、地震反射特征和形态上都表现出不同特征。近源水下扇以扇形为主,规模小而数量多,以古隆起物源、沉积物粒度粗、电性整体箱形、地震反射杂乱振幅强为特征;远源水下扇以朵叶形为主,规模大而数量少,以三角洲前缘物源、沉积物粒度细、电性整体钟形、地震反射杂乱振幅弱为特征。 相似文献
3.
《地质科技情报》2017,(5)
深水沉积砂岩储层是近年来全球油气勘探重点领域之一,对于深水沉积模式认识、沉积类型划分、储层分布规律及宏观演化规律能否实现系统深入的认知也成为制约全球油气勘探获得更多突破的关键问题之一。以典型深水沉积广泛发育的西非被动大陆边缘尼日尔三角洲盆地和刚果扇盆地为研究区,以地震资料为主,钻井资料为辅,开展针对性的深水沉积体系层序界面识别,明确研究区层序及体系域划分方案,建立深水沉积层序地层格架;综合2个研究区的深水沉积特征,探索建立了一套西非地区的深水沉积类型的划分方案,将其划分为陆坡峡谷、块体流、水道体、朵叶体、半深海泥5种亚相;将块体流细化为滑移体和滑塌碎屑流2种微相,将水道体进一步划分为高侵蚀充填型水道、低侵蚀过路加积型水道、过路高弯度水道、废弃水道、堤岸-漫溢5种微相,将朵叶体细分为末端朵叶和决口扇朵叶2种微相;同时系统总结解剖了各微相的岩性组合、地震反射及平面发育特征;深入分析了研究区深水沉积体系的宏观演化特征及展布规律,认识到尼日尔三角洲盆地深水沉积体系中水道体和朵叶体均有发育,自下向上,随着相对海平面先下降再上升的过程,早期主要发育朵叶体沉积,晚期则转变为以发育大型浊积水道为主。刚果扇盆地深水沉积则主要为水道体沉积,朵叶体较少发育,早期水道规模小,中期开始发育多支复合水道并呈退积趋势,水道发育程度逐渐降低,至晚期水道能量及侵蚀能力复又转强,甚至形成较大的陆坡峡谷及多支水道体。 相似文献
4.
应用深水沉积学和地震沉积学的相关理论,通过岩心观察描述、钻测井资料分析及平面沉积相编图,对下刚果盆地A区块白垩系Pointe Indienne组深水重力流的类型、沉积特征、垂向沉积组合及沉积模式进行了探讨分析,指出该地区发育砂质碎屑流、泥质碎屑流、浊流及与重力流形成过程相关的滑动—滑塌沉积,并总结了该深水重力流的沉积模式。结果表明:砂质碎屑流沉积以块状层理细砂岩为主,含大型漂浮泥砾和泥岩撕裂屑;泥质碎屑流沉积以泥级碎屑为主,含有少量的暗色泥岩碎屑和砂质团块,见“泥包砾”结构;浊流沉积以发育完整或不完整的鲍马序列为特征;滑动—滑塌沉积具有明显的剪切滑移面,可见旋转火焰构造、砂岩扭曲杂乱分布及褶皱变形层;纵向上可识别出4种类型的重力流沉积垂向组合,以多期砂质碎屑流沉积叠置和砂质碎屑流沉积与浊流沉积叠置最为常见;研究区深水重力流沉积可分为上部扇、中部扇和外部扇3部分,上部扇以主水道沉积为主;中部扇以辫状水道和溢岸沉积为主,砂体厚度较大;外部扇以朵叶体沉积和薄层浊积岩为主,砂体厚度相对较薄。 相似文献
5.
在济阳坳陷砂砾岩体油气勘探中,砂体复杂分布和油水差异聚集等问题引发了对现有近岸水下扇沉积充填样式的思考、探索和补充。为完善断陷湖盆陡坡带砂砾岩体发育模式提供实验素材和地质实例,在系统梳理前人研究硕果的基础上,通过开展水槽沉积模拟实验、解析沉积充填过程,并结合油气勘探实践论证。可将断陷湖盆陡坡带近岸水下扇分为扇根、扇中、扇间和扇端4种沉积亚相,并包括9种沉积微相;较之以往,补充建立了扇中坡积朵叶体微相和扇间侧向迁移朵叶体微相,前者多超覆在早期扇主体斜坡之上,纵向呈独特的前积式反旋回并表现为“底凹上凸”的外部形态,后者则以发育正粒序中—细砂岩为主,沉积充填特征显著;二者均与半深湖—深湖泥岩、扇端和扇间泥岩紧密接触,利于形成岩性圈闭;济阳坳陷陡坡带以坡积朵叶体和侧向迁移朵叶为勘探目标的多口井接连获得高产、稳产工业油气流,在勘探实践中验证了近岸水下扇扇体沉积新认识,拓宽了断陷湖盆砂砾岩体的勘探新空间。科学发展的动力之一来源于理论与实验的矛盾,油气地质学更是着重表现出“问题由实践中来,认识到实践中去”的特点,基于水槽模拟实验的沉积充填模式探讨是促进沉积学繁荣发展的有效手段。 相似文献
6.
冲绳海槽西南端1.3ka以来异重流沉积记录及其古气候响应 总被引：1，自引：1，他引：0
以冲绳海槽西南端的HOBAB4?S1岩芯为研究对象,综合利用粒度、沉积构造、AMS14C测年等资料,对研究区异重流沉积特征进行研究,对异重流发育的时间段与晚全新世气候事件进行对应。结果表明,岩芯中发育17段异重流沉积,其沉积物组分以砂质粉砂为主,粒度频率分布曲线多呈以70~130 μm为中心的单峰,C?M图上样品点集中分布区间大致平行于C=M基线,且位于PQ段以下,表明沉积物搬运方式为重力流悬浮搬运。异重流内部发育平行层理、爬升沙纹层理和粒序层理等沉积构造。异重流沉积类型主要有两类,一类是厚层异重流沉积,底部侵蚀面发育,内部发育多组逆—正粒序组合,指示了水动力较强,侵蚀作用和沉积作用均较明显的异重流近端沉积;另一类是薄层异重流沉积,底部侵蚀面不发育,内部不发育或仅发育一组逆—正粒序组合,指示了水动力较弱的异重流边部沉积。HOBAB4?S1岩芯的异重流层段集中发育在800~1 300 A.D.之间,指示了当时气候条件为高温高湿,台风、洪水频发,降雨量较大,验证了“中世纪暖期”在东亚地区的存在。 相似文献
7.
综合岩心观察、薄片鉴定、砂砾岩厚度及百分含量等资料,对东营凹陷北带沙四段砂砾岩的沉积特征、成因类型及沉积演化模式进行了系统研究。结果表明,东营凹陷北带沙四段砂砾岩储层中块状层理、粒序层理、平行层理、叠覆冲刷构造、交错层理发育,同时变形构造、泥岩撕裂屑、重荷模和火焰构造常见。碎屑颗粒表现为无分选-中等分选、棱角状-次棱角状到次圆状的近物源沉积特征。岩相类型以块状层理砾岩相、递变层理砾岩相、递变层理砂质砾岩相、交错层理砾质砂岩相、平行层理砾质砂岩相、块状层理砾质砂岩相、块状砂岩相、平行层理砂岩相、块状层理砂岩相、变形层理砂岩相、泥质撕裂变形砂岩相、薄层透镜状或压扁层理砂岩相为主。综合古地貌、砂砾岩沉积特征及沉积机制等,认为东营凹陷北带沙四段主要发育近岸水下扇、湖底扇和扇三角洲等成因类型的砂砾岩扇体。在沉积演化上,沙四下亚段沉积时期,胜坨地区和民丰地区发育近岸水下扇沉积,利津地区发育扇三角洲沉积,扇体规模较小,横向连续性较差;沙四上亚段沉积时期,胜坨地区和民丰地区广泛发育近岸水下扇-湖底扇沉积,利津西部地区发育扇三角洲沉积,扇体规模较大,横向连片发育。 相似文献
8.
利用高分辨率三维地震资料分析了孟加拉扇上扇某区块的深水沉积体特征。发现了六种典型地震相:下切充填相、海鸥翼状相、楔形发散相、透明相、强振幅平行相和弱振幅平行相。下切充填相代表粗粒的水道充填沉积;海鸥翼状相代表水道-天然堤复合体;楔形发散相代表细粒的天然堤沉积;透明相代表块体搬运沉积;强振幅平行相代表朵叶体沉积;弱振幅平行相代表深海披覆沉积。通过对典型地震剖面特征和平面属性分布分析可知:上扇垂向上依次沉积了朵叶体、水道和堤岸、朵叶体、水道-天然堤复合体。 相似文献
9.
珠江口盆地白云凹陷荔湾深水区为油气勘探有利区域,通过岩石学和古生物组合特征研究,认为该区珠江组下部属于典型的深水扇沉积,可划分为早期盆地扇和晚期斜坡扇两种类型,两类深水扇都以发育颗粒流、砂质碎屑流及低密度浊流等顺坡重力流沉积为主,同时夹有少量内波和等深流等深水牵引流改造沉积。砂质碎屑流为两类深水扇水道砂体的主要沉积类型,发育有逆-正粒序层理、平行层理和水平层理,粒序层内可见各种丰富的液化变形和生物逃逸构造,而水平层内发育有更多的生物钻孔和扰动现象。两类深水扇的沉积构造和古生物特征有明显差异,其中盆地扇水道砂岩中普遍含硅质小砾石,水道间泥岩中含有较多保存完好的抱球虫化石,斜坡扇水道砂岩以富含炭泥屑为典型特征,水道间泥岩含有更丰富的颗石藻和抱球虫化石,其中部分抱球虫和颗石具有遭受海底溶蚀作用的现象,指示斜坡扇相对盆地扇有更大的水体深度。平面上两类深水扇具有相似的重力流沉积的分带性,都具有自陆架坡折向盆地方向由颗粒流沉积逐渐向砂质碎屑流和近源高密度浊流、远源低密度浊流等单向演化的特点。 相似文献
10.
鄂尔多斯晚三叠世湖盆异重流沉积新发现 总被引：15，自引：4，他引：11
水下重力流沉积作为重要的油气储层,已成为当前学术研究和油气工业共同关注的焦点.在鄂尔多斯盆地南部延长组长7~长6油层组深湖相沉积中,发现一种不同于砂质碎屑流沉积和滑塌浊积岩的重力流成因砂岩.其沉积特征为一系列向上变粗的单元(逆粒序层)和向上变细的单元(正粒序层)成对出现;每一个粒序层组合内部的泥质含量变化(高-低-高)与粒度变化一致;上部正粒序层与下部逆粒序层之间可见层内微侵蚀界面;砂岩与灰黑色纯泥岩、深灰色粉砂质泥岩互层;粉砂质泥岩层内也表现出类似的粒度变化特征.通过岩芯观察和薄片鉴定,认为该岩石组合形成于晚三叠世深湖背景下的异重流(hyperpycnal flow)沉积.其沉积产物--hyperpycnite(异重岩?)以发育逆粒序和层内微侵蚀面而区别于其它浊积岩,逆粒序代表洪水增强期的产物,上部的正粒序层为洪水衰退期的沉积,逆粒序-正粒序的成对出现代表一次洪水异重流事件沉积旋回;层内微侵蚀面是洪峰期流速足以对同期先沉淀的逆粒序沉积层侵蚀造成的.鄂尔多斯盆地延长组异重岩的发现,不仅为探索陆相湖盆环境下的异重流沉积提供了一个范例,而且对于深水砂体成因研究、储层预测和油气勘探具有理论和现实意义. 相似文献
11.
异重流沉积研究进展 总被引：5，自引：1，他引：4
在相关文献调研基础上,综述了异重流沉积研究现状,并结合中生代湖相异重岩研究实例,建立了“沟道-舌状体-朵状体”异重流沉积模式。异重流(hyperpycnal flow)是一种由洪水期河口直接注入、因密度大于汇水盆地水体密度而沿水体底部分层流动的持续型浊流。它呈牛顿流变性质、紊乱流动状态、湍流支撑机制,具有更高的发生频率和稳定的沉积物供给。异重流主要受地形、气候、密度差等因素控制,海洋和湖泊均有发生;水体密度小、近物源、地形高差大、中-小河流发育、构造活动强烈的陆相淡水湖泊更利于异重流的产生,但陆相湖盆异重流沉积并未引起足够的重视。异重流自近端向远端总体呈稀释趋势,依次对应于特定的沉积构造及序列;由异重流形成的沉积岩被称作异重岩(hyperpycnite),以发育由洪水增强-减弱所产生的逆粒序-正粒序组合、层内微侵蚀面、富含陆源有机质区别于其他浊积岩。深入研究异重流沉积,不仅有益于完善重力流沉积理论、分析沉积环境,而且有利于指导深水非常规油气勘探,具有重要的科学价值和现实意义。 相似文献
12.
Grace I. E. Cosgrove Miquel Poyatos-Moré David R. Lee David M. Hodgson William D. McCaffrey Nigel P. Mountney 《Sedimentology》2020,67(1):431-456
Shelf-margin clinothem successions can archive process interactions at the shelf to slope transition, and their architecture provides constraints on the interplay of factors that control basin-margin evolution. However, detailed textural analysis and facies distributions from shelf to slope transitions remain poorly documented. This study uses quantitative grain-size and sorting data from coeval shelf and slope deposits of a single clinothem that crops out along a 5 km long, dip-parallel transect of the Eocene Sobrarbe Deltaic Complex (Ainsa Basin, south-central Pyrenees, Spain). Systematic sampling of sandstone beds tied to measured sections has captured vertical and basinward changes in sedimentary texture and facies distributions at an intra-clinothem scale. Two types of hyperpycnal flow-related slope deposits, both rich in mica and terrestrial organic matter, are differentiated according to grain size, sorting and bed geometry: (i) sustained hyperpycnal flow deposits, which are physically linked to coarse channelized sediments in the shelf setting and which deposit sand down the complete slope profile; (ii) episodic hyperpycnal flow deposits, which are disconnected from, and incise into, shelf sands and which are associated with sediment bypass of the proximal slope and coarse-grained sand deposition on the medial and distal slope. Both types of hyperpycnites are interbedded with relatively homogenous, organic-free and mica-free, well-sorted, very fine-grained sandstones, which are interpreted to be remobilized from wave-dominated shelf environments; these wave-dominated deposits are found only on the proximal and medial slope. Coarse-grained sediment bypass into the deeper-water slope settings is therefore dominated by episodic hyperpycnal flows, whilst sustained hyperpycnal flows and turbidity currents remobilizing wave-dominated shelf deposits are responsible for the full range of grain sizes in the proximal and medial slope, thus facilitating clinoform progradation. This novel dataset highlights previously undocumented intra-clinothem variability related to updip changes in the shelf process-regime, which is therefore a key factor controlling downdip architecture and resulting sedimentary texture. 相似文献
13.
随着页岩油气勘探开发和相关领域研究的不断深入,细粒沉积物的搬运和沉积已成为当前沉积学研究的热点问题之一,但中国中生代湖泊环境中的泥质重力流沉积尚未引起应有的关注。通过岩心观察、薄片鉴定等手段及综合研究,分析了鄂尔多斯盆地晚三叠世湖相泥质重力流沉积特征,探讨了其形成机制与成因分类。鄂尔多斯盆地三叠系延长组湖相泥页岩结构类型多样,发育泥质块体流沉积、泥质碎屑流沉积、泥质浊流沉积和泥质异重流沉积等多种重力流沉积类型。按照泥质含量将重力流划分为砂质重力流、泥质重力流和混合重力流3种亚类,并根据成因将重力流划分为滑塌体、碎屑流、浊流及异重流等4种亚类;结合成因和泥质含量,将重力流沉积共划分为12种类型。滑塌岩、碎屑岩分布于三角洲前缘斜坡脚附近;浊积岩、异重岩广泛分布于三角洲斜坡至沉积中心。认为泥质沉积物可以在强水动力条件下搬运-沉积;重力流沉积细粒物质在湖相沉积中占据很大的比例;泥质重力流对泥页岩中的碎屑物质、黏土矿物及有机质的搬运和沉积起到重要作用,因而对于页岩油气的生烃、储集性能和压裂工艺研究具有重要意义。 相似文献
14.
Sandy hyperpycnal flows and their deposits, hyperpycnites, have been documented in modern environments and, more recently, in Cretaceous and Tertiary strata; they may be more common in the rock record, and within petroleum reservoirs, than has been previously thought. Muddy hyperpycnites also occur within the rock record, but these are more difficult to document because of their finer‐grained nature and lack of common sedimentary structures. This paper documents the presence of submarine slope mudstone and siltstone hyperpycnites (and muddy turbidites) in the delta‐fed, Upper Cretaceous Lewis Shale of Wyoming; based on field measurements, analyses of rock slabs and thin sections, and laser grain‐size distributions. Four lithofacies comprise laminated and thin‐bedded mudstones that are associated with levéed channel sandstones: (L1) grey, laminated, graded mudstone with thin siltstone and sandstone interbeds; (L2) dark grey to tan, laminated mudstone with very thin siltstone and sandstone stringers; (L3) light grey, laminated siltstones; and (L4) laminated mudstones and siltstones with thin sandstone interbeds. Two styles of mudstone grain‐size grading have been documented. The first type is an upward‐fining interval that typically ranges in thickness from 2·5 to 5 cm. The second type is a couplet of a lower, upward‐coarsening interval and an upper, upward‐fining interval (sometimes separated by a micro‐erosion surface) which, combined, are about 3·8 cm thick. Both individual laminae and groups of laminae spaced millimetres apart exhibit these two grain‐size trends. Although sedimentary structures indicative of traction‐plus‐fallout sedimentary processes associated with sandier hyperpycnites are generally absent in these muddy sediments, the size grading patterns are similar to those postulated in the literature for sandy hyperpycnites. Thus, the combined upward‐coarsening, then upward‐fining couplets are interpreted to be the result of a progressive increase in river discharge during waxing and peak flood stage (upward increase in grain‐size), followed by waning flow after the flood begins to abate (upward decrease in grain‐size). The micro‐erosion surface that sometimes divides the two parts of the size‐graded couplet resulted from waxing flows of sufficiently high velocity to erode the sediment previously deposited by the same flow. Individual laminae sets which only exhibit upward‐fining trends could be either the result of waning flow deposition from either dilute turbidity currents or from hyperpycnal flows. The occurrence of these sets with the size‐graded couplets suggests that they are associated with hyperpycnal processes. 相似文献
15.
《Sedimentology》2018,65(6):2149-2170
Hyperpycnal currents are river‐derived turbidity currents capable of transporting significant volumes of sediment from the shoreline onto the shelf and potentially further to deep ocean basins. However, their capacity to deposit sand bodies on the continental shelf is poorly understood. Shelf hyperpycnites remain an overlooked depositional element in source to sink systems, primarily due to their limited recognition in the rock record. Recent discoveries of modern shelf hyperpycnites, and previous work describing hyperpycnites deposited in slope or deep‐water settings, provide a valuable framework for understanding and recognizing shelf hyperpycnites in the rock record. This article describes well‐sorted lobate sand bodies on the continental shelf of the Neuquén Basin, Argentina, interpreted to have been deposited by hyperpycnal currents. These hyperpycnites of the Jurassic Lajas Formation are characterized by well‐sorted, medium‐grained, parallel‐laminated sandstones with hundreds of metre extensive, decimetre thick beds encased by organic‐rich, thinly laminated sandstone and siltstone. These deposits represent slightly obliquely‐migrating sand lobes fed by small rivers and deposited on the continental shelf. Hyperpycnites of the Lajas Formation highlight several unique characteristics of hyperpycnal deposits, including their distinctively thick horizontal laminae attributed to pulsing of the hyperpycnal currents, the extraction of coarse gravel due to low flow competence, and the extraction of mud due to lofting of light interstitial fluid. Recognition of shelf hyperpycnites in the Lajas Formation of the Neuquén Basin allows for a broader understanding of shelf processes and adds to the developing facies models of hyperpycnites. Recognizing and understanding the geometry and internal architecture of shelf hyperpycnites will improve current understanding of sediment transfer from rivers to deeper water, will improve palaeoenvironmental interpretations of sediment gravity‐flow deposits, and has implications for modelling potentially high‐quality hydrocarbon reservoirs. 相似文献
16.
Deep-water gravity flows are one of the most important sediment transport mechanisms on Earth. After 60 years of study,significant achievements have been made in terms of classification schemes,genetic mechanisms,and depositional models of deep-water gravity flows. The research history of deep-water gravity flows can be divided into five stages: incipience of turbidity current theory; formation of turbidity current theory; development of deep-water gravity flow theory; improvement and perfection of deep-water gravity flow theory; and comprehensive development of deep-water gravity flow theory. Currently,three primary classification schemes based on the sediment support mechanism,the rheology and transportation process,and the integration of sediment support mechanisms,rheology,sedimentary characteristics,and flow state are commonly used.Different types of deep-water gravity flow events form different types of gravity flow deposits. Sediment slump retransportation mainly forms muddy debris flows,sandy debris flows,and surge-like turbidity currents. Resuspension of deposits by storms leads to quasi-steady hyperpycnal turbidity currents(hyperpycnal flows). Sustainable sediment supplies mainly generate muddy debris flows,sandy debris flows,and hyperpycnal flows. Deep-water fans,which are commonly controlled by debris flows and hyperpycnal flows,are triggered by sustainable sediment supply; in contrast,deep-water slope sedimentary deposits consist mainly of debris flows that are triggered by the retransportation of sediment slumps and deep-water fine-grained sedimentary deposits are derived primarily from finegrained hyperpycnal flows that are triggered by the resuspension of storm deposits. Harmonization of classification schemes,transformation between different types of gravity flow deposit,and monitoring and reproduction of the sedimentary processes of deep-water gravity flows as well as a source-to-sink approach to document the evolution and deposition of deep-water gravity flows are the most important research aspects for future studies of deep-water gravity flows study in the future. 相似文献
17.
深水重力流沉积领域是当前全球油气勘探与研究的热点,陆相盆地深水重力流沉积研究在我国已有50年历程,大致可以分为3个阶段,即浊流理论探索与发展阶段（1970—1980年）、浊流理论工业化应用阶段（1990—2000年）和砂质碎屑流研究阶段（2010年以后）。近10年来,随着国际深水沉积理论的发展与我国油气勘探技术的进步,湖盆深水沉积研究工作进展迅速,涌现出了大量的新成果、新认识,主要包括以下4个方面: 1）湖盆中央深水区至少存在浊流、异重流、砂质碎屑流及底流4种类型的重力流与牵引流沉积;2）湖盆中不同类型的流体在搬运与沉积过程中存在互相转化,形成混合事件层（Hybrid Event Bed）;3）建立了湖相砂质碎屑流搬运—沉积过程的鉴别标志—— “泥包砾”结构（Mud-coated intraclasts）;4）地震沉积学理论与技术方法在湖相重力流内部沉积单元解剖、湖盆深水沉积模式建立等方面取得巨大成功。展望未来,为适应油气工业勘探开发需求,湖盆深水沉积研究发展趋势主要有5个方面: 1）深水砂体成因类型划分、搬运—沉积过程及沉积模式的建立与完善;2）深水泥页岩（细粒沉积）成因机理、类型划分及其油气意义研究;3）深水沉积“源—汇”系统与地震响应及评价预测研究;4）深水沉积搬运—沉积过程实验模拟研究;5）新的深水沉积理论体系建立及其在油气勘探开发中的应用。 相似文献
18.
辽河西部凹陷雷家地区古近系沙四段混合沉积特征研究 总被引：12，自引：0，他引：12
雷家地区古近系沙四段广泛发育湖相碳酸盐与陆源碎屑混合沉积。通过对研究区混合沉积的区域地质背景、岩石学特征、沉积环境等分析,认为该区混合沉积特征为结构混合和互层混合,其中结构混合（狭义的混积岩）在不同构造部位混积岩岩石成分不同,西部以内源型混合沉积为主,中东部以陆源型混合沉积为主,局部为火山岩型混积岩。混合沉积作用类型包括渐变式混合沉积和复合式混合沉积Ⅰ类,局部发育突变式混合沉积。最后,分析本区白云岩的成因,进而探讨形成混合沉积的地质条件和沉积环境。 相似文献