陕北青化砭油田长2砂岩储层物性的控制因素   总被引：4，自引：0，他引：4  

冯娟萍  李文厚  欧阳征健  余芳  曹红霞  赵阳 《吉林大学学报(地球科学版)》2008,38(3):417-424

青化砭油田上三叠统长2辫状河砂岩储集层物性主要受沉积相及成岩作用的控制。沉积相通过控制储集岩的颗粒粒度及粘土矿物含量来控制储集物性,河道中心砂岩的物性好于河道侧翼砂岩,河道间沉积的储集物性最差。压实作用是造成砂岩原生孔隙丧失的主要原因,碳酸盐矿物和石英的次生加大胶结是降低储层物性的主要胶结作用,经溶解作用改造的辫状河河道砂体成为储集性能良好的油气储集体,是今后研究区长2油层组的主攻目标。  相似文献   

沉积环境对苏锡常地区潜水水质空间分布的影响分析          下载免费PDF全文

王彩会  陈杰  黄晓燕 《江苏地质》2008,32(2):122-125

在全面的水质调查的基础上,对苏锡常地区采集潜水水样进行分析。测试结果表明：苏锡常地区潜水水质在空间分布上具有较为明显的分带性。通过分析认为：苏锡常地区潜水的水质在空间上的差异与含水层及其包气带的沉积环境有着密切的联系;基底构造的继承性差异沉降运动、气候冷暖交替引起的海面频繁升降以及河流、湖泊的搬运与沉积均对区内潜水水质的水化学特征的形成起到控制性作用。  相似文献   

辽河西部凹陷储层成岩作用及有利储层预测          下载免费PDF全文

张学军  谢庆宾  邹育良 《甘肃地质》2008,17(1):72-78

通过成岩作用研究与储层综合评价技术,预测辽河西部凹陷南区沙河街组有利储层的平面展布。通过对薄片的鉴定,确定本区砂岩主要类型;利用普通薄片、铸体薄片、扫描电镜、阴极发光等手段研究不同地区、不同层位、不同沉积环境的成岩作用;同时确定主要孔隙类型;以及依据有机质成熟度有关指标等成岩序列和成岩阶段划分标志,进行成岩作用的研究结果表明,划分成岩阶段;通过217口井的薄片资料、沉积相分布和油气分布区图例的分析,确定本区成岩相主要类型;依据岩心测试、测井解释成果,以及孔隙度—深度关系图,发现纵向上储层发育3个主要次生孔隙发育带;通过对储层次生孔隙带形成的主控因素分析得知,通过建立储集物性与沉积相关系、建立成岩作用与储集特征的关系、构造活动与储层发育之间的关系,结合沉积相图、成岩相图、各井储层物性综合评价图,平面上圈定出有利储层、较有利储层发育区。  相似文献   

鸳鸯沟洼陷西斜坡成岩作用定量表征及有利区带预测   总被引：3，自引：0，他引：3  

陈振岩  孟元林  高建军  黄文彪 《地学前缘》2008,15(1):71-79

储层实测孔隙度、普通薄片、铸体薄片和扫描电镜的资料表明,辽河坳陷鸳鸯沟洼陷西斜坡新生界储层在纵向上发育三个次生孔隙带。从而在一个普遍低孔渗背景下,形成了孔隙度相对较高的优质储层。优质储层的形成和分布主要受沉积微相和成岩作用的双重影响与控制。它们形成于辫状分流河道、河口坝+席状砂沉积微相,目前处于早成岩阶段B期—中成岩阶段A1亚期,发育溶蚀成岩相。该文通过成岩作用定量表征方法,预测了鸳鸯沟洼陷西斜坡成岩阶段和成岩相的横向展布。通过成岩相图和沉积微相图的叠合,预测了沙三中上亚段优质储层的分布。预测结果表明,优质储层主要发育于斜坡区的中部。  相似文献   

Controls on the first appearance of jadeitic pyroxene, northern Diablo Range, California     

B. E. PATRICK  H. W. DAY 《Journal of Metamorphic Geology》1989,7(6):629-639

A reaction producing jadeitic pyroxene in metagreywackes of the northern Diablo Range has been identified on the basis of mineral distribution, isograd patterns and composition of coexisting minerals. The appearance of jadeitic pyroxene (∼Jd₈₀) is closely followed by the disappearance of pumpellyite, which indicates that pumpellyite plays a major role in the pyroxene-producing reaction. A new projection from hematite, lawsonite, chlorite, quartz and H₂O on to the NaAlO₂-FeO-MgO ternary confirms the role of pumpellyite in pyroxene production and suggests a reaction of the form: 1.00 pumpellyite + 0.31 chlorite + 8.71 albite + 0.70 hematite + 2.00 H₂O = 8.54 jadeite + 0.57 glaucophane + 3.09 lawsonite + 5.26 quartz. Metagreywackes of the northern Diablo Range were metamorphosed under conditions of P _H2O= P _total at 200-300 °C and 7.5-10.0 kbar. Despite the low temperatures attained during metamorphism, the assumption of equilibrium yields results consistent with field observations and phase relations.  相似文献   

Palaeomagnetic Results From the Tibetan Sedimentary Series of the Manang Area (North Central Nepal)     

E. Appel  R. Müller  R. W. Widder 《Geophysical Journal International》1991,104(2):255-266

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太子河流域早寒武世馒头期沉积环境及硬石膏矿床成因     

马恩国  聂振声  金正焕 《国土资源》1991,(2)

太子河流域下寒武统馒头组可划分4个相带,即潮上膏云岩相,潮上白云岩相,潮间灰岩白云岩相,潮下云斑灰岩相,属障壁海碳酸盐潮坪沉积。石膏形成于潮上带萨布哈,是干旱、燥热环境下的产物。成矿有利的古地理环境是古岛的前缘。  相似文献   

False metamorphic events inferred from misinterpretation of microstructural evidence and P–T data     

R. H. VERNON  R. W. WHITE  G. L. CLARKE 《Journal of Metamorphic Geology》2008,26(4):437-449

Geometrical relationships involving inclusions and partial inclusions in metamorphic microstructures can be inadequate for inferring an order of crystallization and hence a metamorphic reaction. Unique spatial and/or chemical relationships need to be defined for mineral inclusions, in the context of a reference paragenesis, commonly the matrix assemblage. Corona microstructures are reliable indicators of metamorphic reactions, but require considerable care when used to infer reactions or changes in P–T conditions, owing to kinetic problems, as well as to changes in the effective reaction volume during changes across relatively broad P–T stability fields of assemblages. Mineral equilibria models, most commonly implemented through P–T pseudosections, may allow the order in which different minerals become stable along a given P–T path to be inferred. However, the order in which two minerals become stable may be different from the order in which two grains of these minerals nucleate. Furthermore, such diagrams cannot make predictions about which minerals will form porphyroblasts and which minerals will form inclusions in porphyroblasts. An evaluation of three examples from the Australian Proterozoic shows that modelling, in combination with inclusion‐host relationships, is a powerful tool for understanding the metamorphic evolution of a rock, but involves considerable uncertainty.  相似文献   

凭祥-东门大断裂中段特征及控岩控相初析--以宁明-板利地区为例     

蒙有言  周秋娥  李玉坤 《南方国土资源》2002,15(4):1-4

文章收集了凭祥-东门大断裂在宁明-板利地区的详细资料,研究该断裂在该地区的表现特征,分析其活动性质及期次,阐明了该大断裂具有多期次活动的特点,并且在不同期次和不同地段具有不同的活动特点和表现形式,在此基础上结合区域地层、岩石特征,阐明其对区域的控岩、控相作用,为三级构造单元界线的划分提供了基础资料.  相似文献   

Geochemical constraints of the eclogite and granulite facies metamorphism as recognized in the Raobazhai complex from North Dabie Shan,China     

Y. L. Xiao  J. Hoefs  A. M. Van Den Kerkhof  S. G Li 《Journal of Metamorphic Geology》2001,19(1):3-19

A combined study of major and trace elements, fluid inclusions and oxygen isotopes has been carried out on garnet pyroxenite from the Raobazhai complex in the North Dabie Terrane (NDT). Well‐preserved compositional zoning with Na decreasing and Ca and Mg increasing from the core to rim of pyroxene in the garnet pyroxenite indicates eclogite facies metamorphism at the peak metamorphic stage and subsequent granulite facies metamorphism during uplift. A P–T path with substantial heating (from c. 750 to 900 °C) after the maximum pressure reveals a different uplift history compared with most other eclogites in the South Dabie Terrane (SDT). Fluid inclusion data can be correlated with the metamorphic grade: the fluid regime during the peak metamorphism (eclogite facies) was dominated by N₂‐bearing NaCl‐rich solutions, whereas it changed into CO₂‐dominated fluids during the granulite facies retrograde metamorphism. At a late retrograde metamorphic stage, probably after amphibolite facies metamorphism, some external low‐salinity fluids were involved. In situ UV‐laser oxygen isotope analysis was undertaken on a 7 mm garnet, and impure pyroxene, amphibole and plagioclase. The nearly homogeneous oxygen isotopic composition (δ¹⁸O_VSMOW = c. 6.7‰) in the garnet porphyroblast indicates closed fluid system conditions during garnet growth. However, isotopic fractionations between retrograde phases (amphibole and plagioclase) and garnet show an oxygen isotopic disequilibrium, indicating retrograde fluid–rock interactions. Unusual MORB‐like rare earth element (REE) patterns for whole rock of the garnet pyroxenite contrast with most ultra‐high‐pressure (UHP) eclogites in the Dabie‐Sulu area. However, the age‐corrected initial ε_Nd(t) is ? 2.9, which indicates that the protolith of the garnet pyroxenite was derived from an enriched mantle rather than from a MORB source. Combined with the present data of oxygen isotopic compositions and the characteristic N₂ content in the fluid inclusions, we suggest that the protolith of the garnet pyroxenite from Raobazhai formed in an enriched mantle fragment, which has been exposed to the surface prior to the Triassic metamorphism.  相似文献