共查询到20条相似文献，搜索用时 531 毫秒
1.
借助大量岩石薄片和铸体薄片鉴定以及扫描电镜观察等手段,对黄桥地区二叠系龙潭组进行储层特征分析,认为该区岩石成分成熟度较低,结构成熟度中等。该区储层的储集物性主要受沉积作用和成岩作用的共同影响。研究区储层碎屑岩的矿物粒度、分选性和磨圆度等因素直接导致了研究区储层的低孔渗值。成岩作用中的压实和胶结作用使储层原生孔隙迅速减少、渗透率降低,而溶蚀作用则是导致次生孔隙发育及改善砂岩储集性能的主要因素。黄桥地区龙潭组储集层主要处于中成岩B期阶段,决定了该区溶蚀型次生孔隙较为发育。结合成岩作用特征和研究区成岩演化模式,认为中成岩阶段A期晚期（白垩纪晚期）是研究区油气藏形成的最佳时期 相似文献
2.
白音查干凹陷桑合地区腾格尔组储层特征及主控因素分析 总被引：1，自引：0，他引：1
白音查干凹陷桑合地区腾格尔组碎屑岩储层岩性主要为长石砂岩、岩屑长石砂岩和长石岩屑砂岩,填隙物以钙质胶结物为主,孔隙式胶结。储集空间类型主要为原生孔隙,以点状、片状喉道为主,具有喉道半径差别大,分选差,孔隙连通性差等孔隙结构特征。沉积环境及成岩作用为该区储层发育的主控因素。扇三角洲平原和前缘过渡带为有利储层发育区。压实及胶结作用通过减小孔隙空间及填充喉道对储层起破坏性作用;溶蚀作用则通过形成次生溶孔对储层起建设性作用。纵向上,发育两个储层物性异常带;平面上,扇三角洲平原与前缘相的过渡带为近物源、多物源、快速堆积模式,压实作用占主导地位,沉积相带与成岩相带共同作用形成平衡带。多种控制因素的综合效应,是该平衡带储层物性变好的主要原因。 相似文献
3.
鄂尔多斯盆地大牛地气田下石盒子组盒2-3段储层成岩作用及其对储层物性的影响 总被引：1，自引：1，他引：0
鄂尔多斯盆地大牛地气田二叠系下石盒子组盒2-3段储层砂岩类型以岩屑石英砂岩和岩屑砂岩为主,岩石结构成熟度和成分成熟度均较低。研究表明该区目的储层的成岩阶段处于早成岩A期,主要发育机械压实、胶结、交代和溶解4种成岩作用。机械压实、胶结和交代作用为破坏性成岩作用,发育程度普遍较强。其中,压实作用和碳酸盐胶结作用是本区储集层中发育最普遍、最典型的两种成岩作用,也是导致储层物性变差的主要因素;溶解作用作为主要的建设性成岩作用,发育程度不高,但在局部区带发育相对较强,是引起该地区储层改善的主要成岩因素之一。储层物性随深度增加呈有规律变化,在2 670～2 750 m深度段孔隙度和渗透率出现异常高值区,该孔隙异常发育带是多种成岩作用综合的结果,油气运聚高峰期产生的有机酸引起的碎屑颗粒和碳酸盐胶结物等的溶蚀对其形成和保存有重大贡献。 相似文献
4.
辽河滩海西部凹陷古近系碎屑岩储层成岩作用及其对储层物性的影响 总被引：7，自引：5，他引：2
辽河滩海西部凹陷古近系储层砂岩类型主要以长石岩屑砂岩、岩屑长石砂岩、岩屑砂岩及杂砂岩为主,为近源、多源沉积体系,砂岩成分成熟度及结构成熟度低。孔隙类型包括原生孔隙、次生孔隙及混合型孔隙。研究表明该区古近系储层成岩阶段处于早成岩B段至晚成岩A段,主要发育机械压实、胶结、溶解及交代等4种成岩作用。其中溶解作用为主要的建设性成岩作用,发育程度普遍较强。机械压实、胶结及交代等成岩作用为破坏性成岩作用,发育程度中等。储层物性随深度增加呈现有规律的变化,在1 400~2 600 m和2 800~3 400 m深度范围内,孔隙度和渗透率出现异常高值。成岩作用的强度和期次是影响储层孔隙发育的主控因素之一,该区的两个异常孔隙发育带是各种成岩作用综合的结果。其中第一异常孔隙发育带与有机质成熟有关,成岩环境为酸性;第二异常孔隙发育带则与碱性成岩作用有关,硅质组分的溶解对次生孔隙的形成及保存具有重大的贡献作用。 相似文献
5.
山东桩海地区中生界碎屑岩储层特征及其控制因素 总被引：2，自引：1，他引：1
采用岩芯观察、薄片鉴定、扫描电镜分析及X-衍射分析等手段,对桩海地区中生界碎屑岩储层的成岩作用、储集空间和控制因素进行了研究。结果表明,桩海地区中生界碎屑岩储层经历了强烈的压实压溶作用和胶结交代作用、多期次的溶解作用和裂缝形成作用;成岩作用阶段可划分为早成岩B,中成岩A1,A2 和中成岩B期。储集空间以溶解孔隙和裂缝为主,裂缝主要有构造裂缝、压实裂缝和解理裂缝;溶解孔隙主要有长石溶解孔隙和碳酸盐胶结物溶解孔隙,其成因主要与大气降水溶解作用和沙河街组、东营组有机质演化过程中形成的有机酸溶解作用有关。桩海地区中生界碎屑岩储层的控制因素主要有沉积作用、成岩作用和构造作用。沉积作用控制了碎屑岩杂基、分选、磨圆等结构特征,进而控制了原生孔隙结构,为后期溶解作用的形成奠定了基础。断层和不整合面作为流体运移通道为溶解作用提供酸性介质,断层和不整合的规模越大对碎屑岩储层物性的控制作用越明显,距离断层和不整合面越近的储层物性越好。溶解作用受沉积作用和构造作用的控制,在原始孔隙结构好、压实作用和早期胶结作用弱以及裂缝发育的地区,溶解作用强烈、次生孔隙发育、储层物性好。在沉积作用、成岩作用和构造作用的综合控制下,中生界顶底及内部不整合面附近发育多个次生孔隙发育带,中生界顶部处于中成岩A1 亚期的储层次生孔隙最发育。 相似文献
6.
通过岩石铸体薄片和扫描电镜观察,结合压汞测试、微米CT扫描技术、X射线衍射、流体包裹体分析等,刻画琼东南盆地凹陷梅山组碎屑岩的岩石学面貌和物性特征,研究成岩作用以及对储集性能的影响,并通过成岩岩相分析预测了有效储层的可能发育区带。研究表明,琼东南盆地凹陷梅山组碎屑岩岩性以长石质石英细砂岩、粉砂岩为主,点-线接触,颗粒支撑结构。胶结物类型主要是黏土矿物和碳酸盐矿物。孔隙类型主要是粒间溶孔,其次为残余粒间孔和粒内溶孔,孔隙大小中等,以细-特细喉道为主,具有中孔、低渗-特低渗特征。破坏性成岩作用主要是压实作用,其次为胶结作用,主要的建设性成岩作用是溶蚀作用。三角洲前缘可能是研究区梅山组碎屑岩中有效储层发育的有利区带。 相似文献
7.
柴达木盆地柴西南区碎屑岩储层形成的主控因素分析 总被引：10，自引：4，他引：10
运用大量的岩矿分析测试资料系统地研究了柴达木盆地柴西南区碎屑岩储层性质的控制因素,指出沉积环境、岩石学特征、埋藏成岩史、异常高流体压力和盐湖水介质环境是控制储层成岩演化和储集性质的主要因素。该区广泛发育的三角洲平原和前缘的分流河道及滨湖砂坪微相砂岩是优质储层发育的基本条件。储层碎屑组分中的塑性颗粒含量和粒径是储层性质的重要控制因素;成岩作用是储层性质的决定性因素,其中压实作用对储层性质的影响最大,胶结作用仅在局部地区成为重要的控制因素,溶蚀作用的影响是比较有限的。而储层的压实作用主要受储层岩性、成岩胶结强度、埋藏史和地层流体压力等4个因素的控制。岩性是通过储层中塑性岩屑含量随粒径的变化以及不同粒级的储层具有不同的抗压性等两方面表现出来的,成岩期胶结物的发育可以使储层的压实作用明显减弱,埋藏史可以造成储层性质的较大差异,而高压地层流体压力可以有效地抑制压实作用的进行。 相似文献
8.
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
9.
以济阳坳陷桩海地区下古生界冶里—亮甲山组为研究对象,应用岩石铸体薄片、阴极发光、扫描电镜、成像测井资料、碳、氧同位素地球化学手段,并结合研究区成岩演化特征,对研究区冶里—亮甲山组白云岩储层建设性成岩作用的类型、成岩演化过程及其对储层的影响进行研究.结果表明,建设性成岩作用主要包括白云石化作用、破裂作用、溶蚀作用.区内白云岩主要为微-细晶白云岩,夹少量细-中晶白云岩和泥-微晶白云岩;碳、氧同位素特征显示研究区白云岩主要发生埋藏白云石化作用,极个别准同生白云石化作用,白云石化作用主要发育在加里东运动早期及海西运动中后期.白云石化作用可形成晶间孔发育的白云岩储层,与灰岩相比具有良好的孔渗条件,为后期裂缝的发育及流体的溶蚀提供岩石基础;破裂作用主要发育在印支运动末期、燕山运动期、喜马拉雅运动期早期,多期的构造运动使得区内构造裂缝发育,为流体的溶蚀提供通道;溶蚀作用在各构造运动阶段均有发生,主要包括表生大气淡水溶蚀、热液溶蚀以及有机酸溶蚀作用,对储层改造作用明显.整体看来,白云石化作用是白云岩优质储层形成的基础,破裂作用是条件,溶蚀作用是关键,3种成岩作用叠加,有利于次生孔隙的发育及后期改造,提高了储集物性,控制了现今白云岩优质储层的形成. 相似文献
10.
库车坳陷东部下第三系碎屑岩储层分异成因模式 总被引：1，自引：0，他引：1
库车坳陷东部下第三系优质储层主要发育于细粒碎屑岩, 而不是粗粒碎屑岩中.从构造沉积作用分析入手, 结合该区的古气候特征, 通过对两种碎屑岩沉积和成岩演化过程的深入分析, 认为粗粒与细粒碎屑岩经历了同沉积、浅埋藏区域地下水、中深埋藏压实、构造破裂与埋藏溶蚀、构造挤压与超压形成等多阶段的叠合改造, 不同阶段对碎屑岩储层特征影响不一, 从而使得储层储集空间特征出现较大分异.成岩与储层分异的结果形成了现今的油气储层, 主要发育于细粒的粉砂岩储层中, 据此建立了储层发育演化的成因模式. 相似文献
11.
吉林省南部早太古宙上壳岩是太古宙高级区的组成部分,它包括变质火山岩和变质沉积岩,其中各类变质火山岩的地球化学特征与康迪统计的太古宙同类岩石大致可此。本区上壳岩随SiO_2含量增高,ΣREE逐渐增高。各类岩石普遍具Ce、Eu的负异常,表明它们具相同的成岩环境。 相似文献
12.
13.
This study integrated surface and subsurface stratigraphic data with geophysical logs and hydrogeologic data in order to
characterize the hydraulic properties of the Silurian dolomite in northeastern Wisconsin. Silurian stratigraphy consists of
predictable alternations of characteristic facies associations. A vertical profile of hydraulic conductivity, obtained from
short-interval packer tests in a core hole that penetrates a majority of the Silurian section, indicates that hydraulic conductivity
ranges over five orders of magnitude (10–1 to 10–6 cm/s). Matrix conductivity is generally low and varies with texture; the finer-grained restricted-marine and transitional
facies being less permeable than the coarser-grained open-marine facies. High-conductivity values are generally associated
with bedding-plane fractures, and fracture frequency is greater in the restricted-marine facies.
High-flow features in 16 wells were identified using fluid-temperature/resistivity and heat-pulse flowmeter logs. Natural-gamma
logs were used to identify the stratigraphic position of flow features in each well and to correlate flow features to specific
stratigraphic horizons. By combining stratigraphic, geophysical, and hydrogeologic data, 14 high-permeability zones within
the Silurian aquifer have been identified and correlated in wells more than 16 km apart. These zones parallel bedding, appear
most pronounced at contacts between contrasting lithologies, and are most abundant in restricted-marine lithologies.
Electronic Publication 相似文献
14.
Delineation of capture zones for municipal wells in fractured dolomite, Sturgeon Bay, Wisconsin, USA 总被引：1，自引：1，他引：1
A wellhead protection study for the city of Sturgeon Bay, Wisconsin, USA, demonstrates the necessity of combining detailed
hydrostratigraphic analysis with groundwater modeling to delineate zones of contribution for municipal wells in a fractured
dolomite aquifer. A numerical model (MODFLOW) was combined with a particle tracking code (MODPATH) to simulate the regional
groundwater system and to delineate capture zones for municipal wells. The hydrostratigraphic model included vertical and
horizontal fractures and high-permeability zones. Correlating stratigraphic interpretations with field data such as geophysical
logs, packer tests, and fracture mapping resulted in the construction of a numerical model with five high-permeability zones
related to bedding planes or facies changes. These zones serve as major conduits for horizontal groundwater flow. Dipping
fracture zones were simulated as thin high-permeability layers. The locations of exposed bedrock and surficial karst features
were used to identify areas of enhanced recharge. Model results show the vulnerability of the municipal wells to pollution.
Capture zones for the wells extend several kilometers north and south from the city. Travel times from recharge areas to all
wells were generally less than one year. The high seasonal variability of recharge in the study area made the use of a transient
model necessary.
Electronic Publication 相似文献
15.
Previous researchers in Dazhuoma area of Southern Qiangtang Basin have found some sporadic oil and gas on the surface and collected a small amount of source rocks for analysis, but the exploration degree was generally low and they have not carried out systematic analysis of the generation, storage and cap of oil and gas. Based on the previous data, the authors in this paper have studied the characteristics of the source rocks, reservoir rocks and cap rocks in Dazhuoma area of Southern Qiangtang Basin by means of field petroleum geological survey, sample collection, indoor analysis and comparative research. The results suggest that the mudstone and shale of Adula Formation in the study area are considered as good source rocks, and the mudstone and silty mudstone of Sewa Formation are poor-medium source rocks, while Buqu Formation, Shari Formation and Suowa Formation are poor source rocks. The main reservoir rocks are the sandstone of Adula Formation and the dolomite of Buqu Formation. The cap rocks are argillaceous rocks, limestone and gypsum, and are mainly Ⅰ and Ⅱ cap rocks. Furthermore, the discovery of oil exposure shows that this basin has underwent the process of oil and gas generation, migration, gathering and losing, which builds the material foundation of oil and gas generation and the petroleum geological conditions of hydrocarbon accumulation. It is suggested that more drilling should be arranged in Darzhuoma anticline with good oil and gas storage conditions, and further deep research should be carried out to achieve oil and gas breakthrough in this area. 相似文献
16.
《地学前缘(英文版)》2018,9(6):1777-1794
Sedimentary rocks cover-73% of the Earth's surface and metamorphic rocks account for approximately91% of the crust by volume. Understanding the average behavior and variability of heat production for these rock types are vitally important for developing accurate models of lithospheric temperature. We analyze the heat production of ～204,000 whole rock geochemical data to quantify how heat production of these rocks varies with respect to chemistry and their evolution during metamorphism. The heat production of metaigneous and metasedimentary rocks are similar to their respective protoliths. Igneous and metaigneous samples increase in heat production with increasing SiO_2 and K_2 O, but decrease with increasing FeO, MgO and CaO. Sedimentary and metasedimentary rocks increase in heat production with increasing Al_2 O_3, FeO, TiO_2, and K_2 O but decrease with increasing CaO. For both igneous and sedimentary rocks, the heat production variations are largely correlated with processes that affect K_2 O concentration and covary with other major oxides as a consequence. Among sedimentary rocks,aluminous shales are the highest heat producing(2.9 μW~(-3)) whereas more common iron shales are lower heat producing(1.7 μW m~(-3)). Pure quartzites and carbonates are the lowest heat producing sedimentary rocks. Globally, there is little definitive evidence for a decrease in heat production with increasing metamorphic grade. However, there remains the need for high resolution studies of heat production variations within individual protoliths that vary in metamorphic grade. These results improve estimates of heat production and natural variability of rocks that will allow for more accurate temperature models of the lithosphere. 相似文献
17.
变质岩分类的三要素是:变质岩的物质成分(化学成分、矿物成分)、变质岩的组构(结构、构造)和变质岩的成因(变质作用类型和形成变质岩的物理化学条件).由于变质岩的化学成分、矿物成分、组构特征和形成变质岩的地质环境十分复杂,致使至今尚无以变质岩分类三要素为基础的、内容比较完善的分类方案.本文中主要变质岩的分类是以其分类三要素为基础编制的,首次将不同成因的变质岩类并列于同一表中、将鉴定变质岩的主要标志性矿物成分和组构特征列入同一分类表中.该分类对鉴定变质岩石具有可操作性和实用性,分类表中涵盖了自然界主要的变质岩石. 相似文献
18.
前人在南羌塘达卓玛地区零星发现了一些地表油气显示并采集了少量的烃源岩进行分析,但勘查程度总体较低,未开展系统的生、储、盖研究。结合前人资料,通过野外石油地质调查、样品采集、室内分析、对比研究等手段,对南羌塘盆地达卓玛地区的烃源岩、储集岩、盖层等油气地质条件进行了分析,认为研究区阿堵拉组泥岩、页岩为好烃源岩,色哇组泥岩、粉砂质泥岩为差—中等烃源岩,布曲组、夏里组和索瓦组发育差烃源岩; 储集岩主要为阿堵拉组砂岩和布曲组白云岩; 盖层有泥质岩、灰岩和石膏,以Ⅰ、Ⅱ类盖层为主。野外调查中发现了大量地表油气显示,盆地经历了油气生成、运移、聚集和散失的过程,具有油气生成的物质基础和成藏的油气地质条件。建议在油气存储条件良好的达卓玛背斜布置钻井,进一步开展深部研究,力争实现该地区油气突破。 相似文献
19.
CO2矿物捕获能力的研究进展 总被引：2，自引：0，他引：2
全球碳存储的研究表明, CO2最稳定的存储方式是 CO2的矿物捕获, 即将 CO2注入到地下,使其以方解石、菱铁矿、白云石及片钠铝石等碳酸盐矿物的形式存在.适合 CO2矿物捕获的岩石类型主要有火山岩、砂岩和火山碎屑岩.分析了3种岩石类型的金属元素含量、金属元素的释放能力、与 CO2反应生成的矿物类型及对 CO2的捕获量,并比较了3种岩石类型对 CO2矿物捕获能力的差异.其中玄武岩等火山岩的金属离子含量高,但其孔隙空间有限,制约了成岩反应,且 CO2注入后具有逸散的风险;砂岩分布广泛,有足够的孔隙利于流体注入,但是金属离子含量相对较低,对 CO2的矿物捕获所需时间相对较长;火山碎屑岩则结合了前2种岩石类型在矿物捕获方面的优势,是一种理想的 CO2矿物捕获的岩石类型. 相似文献
20.
A small-scale hydrogeological study was conducted in a fractured carbonate-rock aquifer located in a quarry to relate groundwater flow to the fracture network. The field study in the St-Eustache quarry, which integrates structural surveys, well logging and hydraulic tests, showed that the most important features that affect groundwater flow in the sedimentary aquifer are high hydraulic conductivity horizontal bedding planes. Vertical fractures are abundant in the quarry and throughout the region, but they have a minor effect on groundwater flow. To have a significant impact on the flow regime and lead to vertical groundwater flow, the permeability of all vertical joints need to be enhanced compared to what was generally observed at the site. Such an increase in permeability could potentially occur where dissolution and fracturing is more intense or at stress release locations such as near the surface in the quarry. 相似文献