布伦庙地区上古生界储集层特征及评价

为了解布伦庙地区上古生界储集层的基本特征及展布规律,对其沉积相、岩石学特征、成岩作用、储集空间类型、物性特征及孔隙结构等几方面进行了研究．主要储集层为太原组、山西组及上、下石盒子组．太原组、山西组以扇三角洲沉积为主,少部分海湾潮坪沉积．上、下石盒子组为河道砂体至泛滥平原沉积．太原组储集层岩性为粗～中粒、含砾中～粗粒石英砂岩．山西组为岩屑石英砂岩和石英砂岩．上、下石盒子组为长石石英砂岩、岩屑石英砂岩．储集层孔隙类型以次生溶孔为主,对孔隙形成具建设性的成岩作用是溶解作用．储集层物性特征总体上表现为低孔、低渗特点,孔隙度、渗透率相关性不明显．孔隙结构分析结果以Ⅲ类为主．储集层在纵向上是以下石盒子组相对最好．     

春风油田沙湾组储层特征及储集性能分析

春风油田位于准噶尔盆地西部车排子凸起的东北部,主要发育扇三角洲前缘水下分流河道与辫状河三角洲前缘水下分流河道微相。在地层精细划分对比及沉积微相研究基础之上,通过岩心、薄片观察,结合扫描电镜、X-衍射分析、压汞曲线等实验数据,对春风油田沙湾组一段1砂组展开储层特征及主控因素研究。研究结果表明:沙湾组一段1砂组N_1s_1~1层主要为棕褐色含砾不等粒砂岩,经鉴定认为属于岩屑质长石砂岩,目的层自下而上呈现出底砾岩→粗砂岩+含砾砂岩→细砂岩+泥质粉砂岩三层结构;储集空间主要为原生粒间孔,大孔粗喉型及大孔中喉型为目的层油气主要富集型孔隙结构;常见碳酸盐胶结,不同井区不同相带下碳酸盐含量差异较大,为影响储层物性的主控因素。     

下寒武统大林子组溶解蒸发岩系旋回层序及渗流构造成因

《科学通报》第44卷第16期发表了《华北中新元古代及早古生代地震灾变事件及与Rodinia的关系》[1]一文（以下简称《华北》）,涉及辽宁大连下寒武统大林子组的成因问题.我们曾先后于1984～1986,1993～1995和2001年对该组地层进行过详细的旋回层序、微层序和岩石学及微组构成因研究,对大林子组中段溶解蒸发岩系进行了几至几十厘米的超微层单元逐层观测取样,进行室内显微岩石组构和化学组分分析.本文按层序、岩石组构分析和比较     

东方1-1气田14井区储层孔隙结构特征研究

本文通过铸体薄片、扫描电镜、常规压汞及恒速压汞等实验分析手段,对东方1-1气田14井区储层孔隙结构特征进行研究。结果表明：研究区砂岩类型以岩屑石英砂岩为主,部分为石英砂岩,结构成熟度较高。研究区储层孔隙类型多样,结构相对复杂,根据常规压汞资料可将储层分为三类。孔隙结构是影响储层物性的主要因素,也是影响开发效果的重要因素。     

新疆十红滩铀矿床含矿目的层物质来源及其构造背景分析：来自岩石学和地球化学证据

十红滩铀矿床位于中国新疆吐哈盆地西南缘艾丁湖斜坡,是典型的层间氧化带型铀矿床,西山窑组为最重要含矿目的层之一。明确其岩石学和地球化学特征,对于盆地找矿和地浸采铀均十分重要。通过对矿区西山窑组碎屑岩岩石学研究、微量元素和稀土元素测试分析,可知西山窑组碎屑岩成分成熟度和结构成熟度均较低,以岩屑砂岩为主,为近物源沉积产物;母岩经历了较强风化作用,其成分特征与上地壳相似,轻稀土富集,重稀土较平坦,铕亏损较明显,物源主要来源于上地壳长英质岩石,母岩沉积构造背景为活动大陆边缘岛弧相关的沉积盆地。     

吐哈盆地布尔加地区含铀矿目的层岩石学特征及其意义*

布尔加地区位于吐哈盆地西北缘,中下侏罗统水西沟群是该区砂岩型铀矿床的主要含矿层位,具有较好的产铀前景。通过野外地质调查、钻孔及野外露头取样、室内镜下观察以及结合前人的研究成果,对该区的成矿砂岩的岩石学特征进行研究,发现目的层砂岩结构成熟度较低,具有搬运距离短,沉积速度快的特点。物源主要来自二叠系火山碎屑岩,砂岩的致密跟成岩作用和后期构造运动有关。砂岩的物性影响氧化流体的运移,与铀成矿紧密相关。     

Petrology and mineral chemistry of new ureilites found in Grove Mountains, Antarctica

Petrography and mineral chemistry of two new ureilites, GRV 021512 and 022931, from the Grove Mountains, Antarctica, are reported in this paper. GRV 021512 exhibits a typical ureilite texture, and consists of 48.3% olivine, 9.4% pigeonite and 38.1% carbonaceous interstitial material and/or reduction product. GRV 022931 has a cataclastic porphyritic texture, and consists of 19.1% olivine and 14.1% pigeonite embedded in 66.3% carbonaceous interstitial material and/or reduction product. The coarse-grained olivine and pigeonite in both meteorites have homogeneous cores, and they are FeO-rich within the range of the ferroan subgroup （subgroup I） of olivine-pigeonite ureilites. All olivine grains of the meteorites show reduction zones along boundaries and cracks. Abundant diamond coexists with graphite as graphite-rich patches and veins in the carbonaceous interstitial material. Petrogenesis of both meteorites and the origin of diamond are discussed.     

Evidence for metasomatic mantle carbonatitic magma extrusion in Mesoproterozoic ore-hosting dolomite rocks in the middle Kunyang rift, central Yunnan, China

The Kunyang rift lying on the western margin of the Yangtze platform is a rare Precambrian Fe-Cu mineralization zone. Wuding- Lufeng basin that is an important part of the zone is located on the west edge in the middle of the rift. The most important ore-hosting rocks are Mesoproterozoic dolomite rocks in the basin controlled by a ring fracture system, which is a fundamental structure of the basin. Plenty of silicate minerals and acicular apatite, feldspar phenocrysts and small vesicular, flown line and flown plane structures, melt inclusion and high temperature fluid inclusion found in most ore-hosting dolomites suggest that this kind of rocks could not be sedimentary dolomite, marble or hydrothermal carbonate rocks. The Zr/Hf and Nb/Ta values of the rocks are identical with those of associated mantle-derived rocks, and vary widely. For the monomineral dolomite, δ^18OSMOW‰=＋5.99 to ＋18.4 and δ^13CPDB‰ = -3.01 to ＋0.94, which fall within the range for all carbonatitic volcanic rocks of the world. As for the accessory minerals, the values of δ^18OSMOW‰ of magnetite （=＋3.47 to ＋5.99‰） are close to that of the mantle （〈5.7%）, and the δ^34S‰ values of sulfides （-5.09 to ＋5.78, averaging ＋1.50） are close to that of meteorite. For all the ore-bearing dolomite rocks, εNd = ＋0.19 to ＋2.27, and the calculated Isr=0.699143, while for the associated mantle-derived rocks, εnd = ＋3.18 to ＋3.72. All the data suggest that the mineral assemblage is not only igneous but also of metasomatic mantle origin. And the presence of acicular apatite indicates that the rocks were formed by magma rapidly cooling. And the phenocryst texture and vesicular, flown and ropy and pyroclastic structures suggest that the igneous rocks were extrusive. Therefore, the ore-bearing dolomite rocks are carbonatitic volcanic rocks. This conclusion implies that most iron and copper ore deposits hosted in the dolomite rocks should be of the carbonatite type.     

羌塘盆地羌南坳陷查郎拉地区储层的基本特征

为了研究羌塘盆地烃源岩的生烃潜力及其储集条件,在野外石油地质调查及室内综合研究的基础上,首次对羌南坳陷查郎拉地区储层的分布、岩石学特征、储集性能等方面进行了全面、系统的研究。指出区内主要以碎屑岩储层为主,其次为碳酸盐岩。碎屑岩岩石类型多为长石岩屑砂岩及岩屑砂岩,分布层位广、厚度大;碳酸盐岩发育相对差,厚度也普遍小。岩性主要为各类颗粒灰岩,储层露头样品物性、孔隙结构普遍差,属于非常规致密型储集层。但露头样品并不能客观地反遇地下储层的储集性能,尤其是羌塘盆地后期经历了多期强烈的构造活动,对储层性能的改善起着积极的意义。