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1.
伊通盆地岔路河断陷不同构造带成岩作用比较 总被引：1，自引：0，他引：1
应用有机质热演化指标,结合黏土矿物分布规律对伊通盆地岔路河断陷不同构造带储层的成岩阶段进行了划分。在黏土矿物分布、地层水分布规律及成岩阶段分析的基础上,结合薄片和扫描电镜及压汞孔隙分析手段,对岔路河断陷储层成岩作用的类型、分布规律与构造、沉积微相、黏土矿物和地层水的关系进行了研究。结果表明:从南往北相应的成岩阶段深度变浅,梁家构造带、万昌构造带和波太凹陷存在3个次生孔隙带,孤店斜坡带均存在2个次生孔隙带,新安堡凹陷不明显;次生孔隙的形成受有机酸、不整合界面处的地表水淋滤及深部碱性作用控制;不同构造带不同微相内压实和胶结作用对储层的影响程度明显不同。 相似文献
2.
伊通地堑岔路河断陷储层成岩演化史与成岩模式 总被引：1，自引：0，他引：1
依据岔路河断陷大量的岩心、薄片、扫描电镜、X衍射等资料,详细研究了岔路河地区储集层特征及成岩作用类型.按照成岩阶段划分标准,将成岩阶段分为早成岩A期和B期,晚成岩A期和B期,其中晚成岩A期又分为A1和A2两个亚期;运用BasinMod软件对主要构造部位进行埋藏史和热史的分析,并结合孔隙演化史的研究,分析了储层成岩演化过程,结果显示,在30Ma以前,储层以压实和胶结作用为主,下部的双阳组和奢岭组孔隙度从32%左右下降至15%左右,上部的永吉组和万昌组孔隙度从32%左右下降至20%左右.在30～10Ma,各地层都沉降至最大埋深,较深部的双阳组和奢岭组砂岩中长石大量溶解,孔隙度增加至18%左右,为油气储存提供了良好的孔隙空间,永吉组和万昌组孔隙度变化不大.在充分考虑了岔路河地区的埋藏史、有机质热演化史、成岩作用演化史以及岩石类型与沉积相等影响因素的基础上,建立了该断陷的3种成岩模式:冲积扇成岩模式、扇三角洲成岩模式和半深湖-深湖相成岩模式. 相似文献
3.
济阳坳陷石炭系—二叠系储层成岩作用及孔隙演化 总被引：1，自引：0，他引：1
石炭纪—二叠纪海陆交互沉积背景下发育的碎屑岩是济阳坳陷主要的储集岩。薄片、扫描电镜等多种微观分析研究表明,储层成岩作用主要有压实作用、胶结作用、交代作用、溶蚀作用及裂缝形成作用等。依据残留地层叠置样式及埋藏史,结合古地温、有机质热演化参数、黏土矿物转化序列、自生矿物以及成岩事件等多方面研究成果,将储层划分为古最大埋深等于现今埋深、古最大埋深大于现今埋深两种成岩阶段类型,前者处于中成岩B阶段和晚成岩阶段,后者处于中成岩A阶段和B阶段。多期复杂的构造运动导致储层具有多变的成岩环境及复杂的成岩演化序列,并控制了储层的成岩演化史、孔隙演化史及储集性能。 相似文献
4.
伊通地堑鹿乡断陷致密储层埋藏成岩作用与孔隙演化 总被引：2，自引：0，他引：2
依据鹿乡断陷岩心、薄片、扫描电镜、X射线衍射及有机包裹体等资料,研究了双阳组储集岩岩石学特征、成岩作用与孔隙演化;运用BasinMod软件进行了地层埋藏史与热史模拟,恢复了双阳组致密储层孔隙演化史;测算了鹿乡断陷成油峰期砂岩可保存孔隙度.结果显示:鹿乡断陷主要经历了压实、胶结、交代、溶蚀4个成岩期,压实和胶结作用是降低孔、渗性能的主要因素.36.5 Ma以前,地层以压实与胶结作用为主,双阳组孔隙度下降了近13%;36.5~30.0 Ma有机质成熟,深部储集岩中硅酸盐与碳酸盐类成岩矿物大量溶解,使溶蚀段孔隙度回升至25%左右,为油气储集提供了良好的次生孔隙空间;10 Ma以后,双阳组地层暂时性抬升而形成微裂隙,此时深部热液沿裂隙侵入造成了裂缝填积、再胶结及白云岩化,但深部双阳组白云岩化作用弱,储集岩孔隙度继续下降. 相似文献
5.
6.
综合利用岩心观察、普通薄片、铸体薄片鉴定观察、图像分析、埋藏演化史与有机质热史演化分析,膏盐层脱水及黏土矿物转化分析等技术方法,对库车坳陷克拉苏冲断带克深区块深部巴什基奇克组致密储层进行了孔隙演化定量研究。这套致密储层主要经历了"黏土膜→早期缓慢浅埋压实作用→长石、岩屑溶蚀和石英加大→早期方解石胶结→中期快速深埋强烈压实作用→长石、碳酸盐胶结物溶蚀→碳酸盐致密胶结→晚期挤压推覆形成裂缝→裂缝溶蚀扩大"的埋藏-成岩演化过程。以孔隙结构特征为基础,定量计算各关键成岩作用对储集空间的影响量(初始孔隙度为37.87%,压实损孔量为27.62%,胶结损孔量为7.51%,溶蚀增孔量为1.7%,裂缝增孔量为1.32%),并以埋藏-成岩演化史为主线及约束,恢复校正不同历史时期不同成岩作用对储层物性演化的控制量,从而恢复储层实际孔隙演化史。研究表明,不同成岩作用对储集层孔隙度的影响量不同,孔隙度整体变化趋势为逐渐减小。克深区块晚期气藏充注时期与区域构造挤压造缝时期配置良好,结合较好的储层孔隙度(6.2%),有利于烃类充注成藏,形成有利勘探目标。 相似文献
7.
塔里木盆地西部碳酸盐岩成岩环境特征及其对储层物性的控制作用 总被引：8，自引：2，他引：8
塔里木盆地西部碳酸盐岩在其漫长的地质演化过程中 ,主要经历了大气淡水成岩环境、海水成岩环境和埋藏成岩环境的改造 ,形成了丰富的成岩组构和成岩作用类型。根据宏观和微观岩石学特征的研究 ,并结合地球化学 ,阴极发光和微量元素分析资料 ,可在研究区鉴别出十三种基本的成岩段类型和八种有利的复合成岩段 ,并详细描述了不同成岩段的成岩组构、成岩矿物组合特征和储集空间类型 ,同时深入探讨了不同成岩段与储层物性间的关系及其受控因素 ,从而将碳酸盐岩成岩演化特征与储层物性特征有机地联系起来 ,为客观评价和预测储集层在纵向和平面上的展布规律确立了理论基础 相似文献
8.
箕状断陷盆地缓坡带层序格架特征与演化--以济阳坳陷为例 总被引：3，自引：0，他引：3
彭传圣 《华东地质学院学报》2005,28(3):239-243
依据缓坡带对层序类型、地层结构特征的控制及地貌特征、成因将济阳坳陷缓坡带分为单断-沉积坡折型、单断-斜坡型和双断-构造坡折型三种类型.三种缓坡类型构造-沉积演化背景不同,形成了不同的层序格架特征.济阳断陷盆地的构造演化史决定了较完整的缓坡带层序演化由双断-构造坡折型向单断-沉积坡折型再向单断-斜坡型演化. 相似文献
9.
《世界地质》2019,(4)
在岩芯观察的基础上,利用普通薄片、铸体薄片和黏土矿物含量等实验分析结果及镜下扫描照片,对松辽盆地北部徐家围子断陷沙河子组致密砂砾岩储层的岩石特征、物性特征、矿物成分、成岩作用以及所处成岩阶段和成岩演化序列进行了研究。结果表明:沙河子组致密砂砾岩储层经历压实、胶结、溶蚀及交代等成岩作用,现今正处于中成岩B期及晚成岩阶段。根据成岩作用类型和强度,成岩矿物及其对储层物性的影响,结合测井分析,将储层划分为强压实钙质胶结相、强压实黏土胶结相、中压实弱溶蚀相及中压实强溶蚀相4种组合成岩相。选取声波时差、电阻率和自然伽马等常规测井曲线,通过岩芯刻度测井归纳了4类成岩相测井响应特征,并采用主成分分析法明确22口井纵向成岩相展布特征,总结归纳出沙河子组致密储层以强压实钙质胶结相为主,有利相为中压实强溶蚀相和中压实弱溶蚀相,且主要分布在断陷两侧。 相似文献
10.
库车凹陷克拉2气田深层优质储层成因及成岩作用模式 总被引：7，自引：1，他引：6
基于成岩作用的影响因素及库车盆地的实际,深入研究了克拉2气田次生孔隙发育段储层岩石成分特征及早期古气候条件下胶结物对于成岩作用及次生孔隙的影响,分析了地层压力系统中超高压带、构造裂缝、自生矿物分带的成因、作用、特点及其与储层物性、成岩环境的相关关系,评价了储层中长石、方解石的溶解,白云石对方解石的交代,压实、胶结等主要成岩作用类型对次生孔隙的具体影响和贡献,认为该区早期碱性成岩环境下方解石胶结物的溶解是形成该区次生孔隙发育带的主导因素,并根据该区自生矿物流体包裹体及埋藏史特征,建立了该区成岩作用及孔隙演化的模式。 相似文献
11.
南海渐新世以来粘土矿物的演变特征及意义 总被引：14，自引：1，他引：13
通过对南海北部ODP184航次1148站32.8Ma以来深海沉积物中粘土矿物组成及其变化特征的分析,发现以15.5Ma为界,下部沉积物粘土矿物组成中蒙脱石含量高达70%,上部则以伊利石和绿泥石逐步增高、蒙脱石含量明显下降为特征,揭示出该区深海沉积物中粘土矿物演变可以分为32.8～15.5Ma的构造控制期和15.5Ma以来的气候控制期。在构造控制期,粘土矿物成分记录了南海扩张演变的历史;而在气候控制期,粘土矿物特征除反映出南海北部周边总体降温的过程外,还显示了3Ma的突然降温,与该站底栖有孔虫氧同位素资料反映的全球气候变化具有很好的对比性。 相似文献
12.
Luke J. Wooldridge Richard H. Worden Joshua Griffiths James E. P. Utley 《Sedimentology》2019,66(3):1118-1138
The specific mineralogy of clay grain coats controls the ability of the coat to inhibit quartz cementation in sandstones during prolonged burial and heating. How and why clay‐coat mineralogy varies across marginal marine systems is poorly understood, even though these eogenetic phenomena strongly influence subsequent mesodiagenesis and reservoir quality. The novel development of the ability to predict the distribution of clay‐coat mineralogy would represent an important development for sandstone reservoir quality prediction. In marginal marine sediments, clay minerals occur as grain‐coats, floccules, mud intraclasts, clay‐rich rock fragments or as dispersed material. However, the relationships between clay mineralogy, the amount of clay, and its distribution is poorly understood. This study focused on the Ravenglass Estuary, UK. The key aim was to develop and apply a novel methodology utilising scanning electron microscope – energy dispersive spectrometry, for the first time, on grain coats in modern sediments, to differentiate the clay‐coat mineral signature from that of the bulk sediment, and reveal the distribution of clay minerals across marginal marine sediments. The study showed that marginal marine sediments principally have their clay mineral assemblage present as clay‐coats on sand grains. These clay‐coats have a mixed clay mineralogy and are spatially heterogeneous across the range of marginal‐marine depositional environments. The study further showed that clay‐coat mineralogy is governed initially by the hydrologically‐controlled segregation of the clay minerals within inner estuarine depositional environments, and subsequently by the selective abrasive removal of specific clay mineral types during reworking and transport into the outer estuary and the marine environment. The highest relative abundance of grain‐coating chlorite was in sand‐flat and tidal‐bar depositional environments. The availability of an analogue data set, and an understanding of the controlling processes of clay‐coat mineralogy, offer crucial steps in building a predictive capability for clay‐coat derived elevated reservoir quality in deeply buried sandstones. 相似文献
13.
根据粘土矿物的相对含量研究了准噶尔盆地南缘新生界砂岩粘土矿物类型、组合特征及纵、横向分布规律及其主要影响因素。划分出无序伊/蒙混层型、部分有序伊/蒙混层型、伊利石+伊/蒙混层型、蒙皂石型以及含坡缕石型等5类粘土矿物组合。按照伊/蒙混层相对含量的变化,粘土矿物纵向上演化呈正常转化型(伊/蒙混层相对含量降低)、反向转化型(伊/蒙混层相对含量增加)和“S”型(伊/蒙混层相对含量呈曲线变化)3种形式。平面上,伊/蒙混层和伊利石这两类主要粘土矿物从湖盆的边缘向中心分别呈现减少和增多的趋势,湖盆边缘相带以无序伊/蒙混层型、蒙皂石型和含坡缕石型为主,湖盆中心则为部分有序伊/蒙混层型和伊利石+伊/蒙混层型组合等类型。上述分布规律的控制因素主要有沉积环境、构造运动及层序发育等。 相似文献
14.
《Geodinamica Acta》2013,26(5-6):259-272
The contents and the distribution of clay minerals in modern sediments of the Cadiz bay and the continental shelf have been studied aiming to establish the sedimentary exchange model and the pathways followed by the clay fraction between the bay and the adjoining continental shelf. The most abundant clay minerals in the muddy sediments consist mainly of illite, smectite, interstratified illite-smectite, kaolinite and chlorite. The application of factor analysis method (PCA) to clay minerals data are considered to be useful in the determination of sedimentary transport patterns. The data from clay mineral assemblages, and their distribution map, make possible to establish the fine sediments transport paths in the study area using clay mineral as natural tracers. This model of transport takes in consideration the facies distribution, the supplies sources and the way of fine sediments are incorporated to the marine environment. Two flows paths have been established: the outflows coming from Cadiz bay and the littoral zones; and the inflows coming from external marine zones of the bay. These flows are controlled by tidal currents and the morphology of the coast. The action of surge and the marine currents, specially the Atlantic Surface Water flow, are also important in the transport of fine sediments coming from sources located to the north of the study zone. 相似文献
15.
Senapathi Venkatramanan Thirunavukkarasu Ramkumar Irudhayanathan Anithamary 《Arabian Journal of Geosciences》2013,6(5):1371-1380
The aim of this study is to understand the various sources and factors controlling the abundance and distribution of clay minerals, sand, silt, clay and organic matter of the surface sediments of Tirumalairajanar Estuary in two different seasons. The study was undertaken for two seasons, based on ten selected stations all along the estuary, mouth and freshwater zone. Furthermore, along the estuary region, clay and silt were observed and also at few stations in the upstream end. Organic matters in the sediments appeared to be the main mechanisms for the distribution of clay minerals in estuary indicated that the distributions of clay minerals were comparatively higher during postmonsoon than in premonsoon season. The clay mineral assemblage consists mainly of chlorite, kaolinite, montmorillonite, illite and very scarce gibbsite. The clay from the sediments has been separated and studied for mineral identification using X-ray diffraction analysis. The present study also reveals that sediment texture is one of the main controlling factors for the distribution of organic matter. 相似文献
16.
鄂尔多斯盆地白垩系粘土矿物的分布特征及其沉积-成岩环境意义 总被引：5，自引：0，他引：5
系统地分析了鄂尔多斯盆地白垩系粘土矿物的特征及其沉积、成岩环境意义。研究结果表明:白垩系砂岩、泥质岩的粘土矿物组合以I+C+I/S型、I+C型为主,具有高伊利石含量,较高绿泥石、伊/蒙混层矿物含量的粘土矿物组成特点;其中泥质岩粘土矿物主要为陆源碎屑成因,次为沉积成岩过程中形成的自生粘土矿物,而砂岩粘土矿物兼有陆源碎屑成因和沉积成岩过程自生成因的特征;白垩系沉积时气候总体特征为干旱—半干旱,但局部时段发生干—湿气候波动而处于短暂的湿热气候环境;白垩系沉积物源富含长石等硅酸盐矿物,沉积物质主要自北、南、西向盆地内部搬运沉积;白垩系沉积和埋藏成岩过程中水介质整体上具有盐度较高,偏碱性,富K+、Fe2+、Mg2+的特点,且总体上盆地南部水介质中的这些指标都高于北部。 相似文献
17.
The study of REE distribution in the clay fraction of sedimentary rocks from two coalfields made it possible to distinguish
several types of REE distribution, which correlate with their mineral composition. It is shown that the REE fractionation
was related to the mineral reconstruction of the primary clay fraction and some detrital minerals in the course of postsedimentary
transformations of rocks during diagenesis, early catagenesis, and beginning of late catagenesis. These transformations were
governed by several factors, such as the composition of sediments; hydrochemical features of accumulation environment; the
chemical composition, dynamics, and feeding sources of pore solutions; the porosity and permeability of sediments and rocks;
and the content of organic matter and its reaction ability. 相似文献
18.
Werner Ehrmann Gerhard Schmiedl Yvonne Hamann Tanja Kuhnt 《International Journal of Earth Sciences》2007,96(4):769-780
Extensive published data sets and some new data on the clay mineral composition of surface sediments in the Aegean Sea, northeastern
Mediterranean Sea, have been compiled in order to map the distribution patterns of clay mineral assemblages and to decipher
source areas and transport paths. We distinguished six provinces, a Northwest Aegean Province, a Marmara-Dardanelles Province,
a West Turkey Province, a Southeast Aegean Province, a Kithira Province and a Central Aegean Province. The clay mineral assemblages
in the coastal and shelf areas carry the signature of the riverine sediment discharge from southeast Europe and Turkey, respectively.
The southern Aegean Sea is probably influenced by the River Nile discharge and transport of clay minerals by surface currents.
The clay minerals in the central Aegean Sea form a mixed assemblage comprising components of the other assemblages. A dispersion
and dilution of clay minerals by surface currents is obvious. 相似文献
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20.
细粒土路基填料承载比试验技术要求及影响因素 总被引：1，自引：0，他引：1
分析了美国、英国、日本和我国交通行业标准对承载比(CBR)试验要求的异同,强调了承载比试验的操作技术及注意事项,并对试验中的一些问题进行了有益的探讨。为了研究影响黏性土CBR值的主要因素,结合在建高速公路15组填料进行了物理、力学试验。分别从土体的颗粒组成、矿物成分以及黏土矿物成分等几方面研究了黏性土填料CBR值的影响。结果显示,在标准的试验方法和相同的试验条件下,当土体的塑性指数相同时,影响CBR值的因素主要是土体中矿物类型及其含量的多少,其次为黏粒组颗粒曲线分布情况及黏粉比m。 相似文献