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1.
浅水三角洲前缘砂体是松辽盆地主要勘探开发目标之一,由于该类储层砂泥岩薄互层十分发育,一直以来都是储层预测中的难点。利用覆盖全区的三维地震资料和已有钻井、测井信息,在建立研究区青三段高分辨率层序地层格架的基础之上,运用"相位调整-地震相-地层切片"的地震沉积学综合研究方法,对松辽盆地南部乾安地区上白垩统青山口组三段的砂体类型、特征及层序格架内砂体演化规律作了进一步探讨。研究表明,青三段可划分为2个三级层序,三级层序内进一步划分为12个四级层序;地震资料进行相位调整后,将地震同相轴与岩相建立相互对应关系,红色波峰代表偏砂相,黑色波谷代表偏泥相;在四级层序约束下提取典型地层切片,并识别出枝状水下分流河道、曲流状水下分流河道和末端水下分流河道3类主要砂体,各类砂体具有不同的地震相特征;SQ1三级层序早期以发育末端水下分流河道为主,晚期以发育枝状水下分流河道和曲流状水下分流河道为主。SQ2三级层序湖侵体系域早期以发育枝状水下分流河道为主,晚期以发育末端水下分流河道为主。SQ2三级层序湖退体系域以发育枝状水下分流河道和曲流状水下分流河道为主。 相似文献
2.
Aromatic hydrocarbons are generally main distillation of crude oil and organic extract of source rocks. Bicyclic and tricyclic aromatic hydrocarbons can be purified by two-step method of chromatography on alumina. Carbon isotopic composition of individual aromatic hydrocarbons is affected not only by thermal maturity, but also by organic matter input, depositional environment, and hydrocarbon generation process based on the GC-IRMS analysis of Upper Ordovician, Lower Ordovician, and Cambrian source rocks in different areas in the Tarim Basin, western China. The subgroups of aromatic hydrocarbons as well as individual aromatic compound, such as 1-MP, 9-MP, and 2,6-DMP from Cambrian-Lower Ordovician section show more depleted 13 C distribution. The 13 C value difference between Cambrian-Lower Ordovician section and Upper Ordovician source rocks is up to 16.1‰ for subgroups and 14‰ for individual compounds. It can provide strong evidence for oil source correlation by combing the 13 C value and biomarker distribution of different oil and source rocks from different strata in the Tarim Basin. Most oils from Tazhong area have geochemical characteristics such as more negative 13C9-MP value, poor gammacerane, and abundant homohopanes, which indicate that Upper Ordovician source rock is the main source rock. In contrast, oils from Tadong area and some oils from Tazhong area have geochemical characteristics such as high 13C9-MP value, abundant gammacerane, and poor homohopanes, which suggest that the major contributor is Cambrian-Lower Ordovician source rock. 相似文献
3.
矿集区找矿预测研究——以辽东青城子铅锌-金-银矿集区为例 总被引：7，自引：4，他引：3
矿集区找矿预测有着不同于典型矿床和区域性成矿预测的规律和特点,是在厘定区内主要类型矿床的成因类型基础上,以"三位一体"(即成矿地质作用与成矿地质体、成矿构造与成矿结构面、成矿作用特征标志)和成矿系统为主要内容开展工作。文章以辽宁青城子铅锌-金-银矿集区为例,系统总结了矿集区的矿床类型、岩浆-成矿系统、"三位一体"找矿预测要素等关键科学问题。青城子矿集区是中国重要的铅锌-金-银矿集区,由于多年的开采,青城子等矿山濒临危机,如何取得该地区找矿突破,是一个亟待解决的问题。对前人研究成果分析表明,该矿集区内铅锌矿床和金、银矿床的成因类型可能均属于岩浆热液型,而非元古代喷流沉积型,矿床的"层控"现象实为特定岩性界面控制的有利成矿结构面;成矿作用主要与印支期花岗斑岩有关,铅锌矿和金、银矿可能是同一岩浆系统演化的产物。在未来的找矿预测中,应重点开展以下5方面工作:(1)查明矿床的具体成矿地质体;(2)进一步提炼成矿期构造控矿规律和成矿结构面样式;(3)凝练有效的成矿作用特征标志,重点是与成矿有关的远程蚀变标志;(4)构建和完善矿集区中生代岩浆-成矿系统,并注意新矿种、新矿床类型的寻找;(5)探索研究矿集区的自然边界,扩大找矿范围和深度。 相似文献
4.
From the viewpoint of environmental remote-sensing applications, this article explains the overall technical characteristics of the Chinese HJ-1A and HJ-1B satellites. It also investigates the spectral characteristics and potential applications of charge-coupled devices, and the infrared and hyperspectral data obtained by the satellites. Examples of applications, such as the remote-sensing monitoring of algal bloom in Taihu Lake, straw burning in southern China, and aerosol optical depth in the area around Bohai sea are presented. These examples illustrate the application characteristics of the HJ-1A and HJ-1B satellite data. 相似文献
5.
Oils, condensates and natural gases in the Kekeya Field, southeast depression of the Tarim Basin were studied for their geochemical characteristics. According to the distribution analysis of the C2/C3 values with C1/C2 values, C2/C3 values with C1/C3 values, as well as C2/C3 values with dryness index, there are two different types of natural gases in the studied field, which are spatially regularly distributed. One is the oil cracking gas, located on shallow reservoirs over X 25 reservoir, namely Upper oil legs; the other is kerogen cracking gas, located on X 27 reservoirs, X8 reservoirs and E2 k reservoirs, namely Lower oil legs. In addition, the distribution patterns of molar concentration of oils and condensates with different carbon numbers of the n-alkanes in the Kekeya Field indicate that the crude oils have experienced several kinds of secondary alterations, which were closely related to the charging of gaseous hydrocarbons after petroleum accumulation. These results indicate that, based on the research of δ 13C values of individual hydrocarbons, heptane values and isoheptane values of light hydrocarbons and aromatic maturity parameters for oils, condensates and natural gases, oils and gases were charged at different geological time in the Kekeya Field.
相似文献6.
内蒙古道郎呼都格地区A型花岗岩年代学、地球化学及地质意义 总被引：5，自引：3，他引：2
道郎呼都格钾长花岗岩体位于华北克拉通北缘白乃庙构造带。SHRIMP锆石U-Pb定年获得139.6±1.7Ma岩体侵位年龄。岩体富硅(SiO2=75.79%~78.07%)、富碱(K2O+Na2O=7.39%~8.29%)、贫钙(CaO=0.22%~0.59%);稀土配分曲线呈现"海鸥式"分布特征,显示强烈的Eu负异常(δEu =0.03~0.12);微量元素特征显示具有较高Ga(21.2×10-6~26.6×10-6)、Zr(173×10-6~417×10-6)、Nb(32.3×10-6~42.4×10-6)和Y(24.6×10-6~53.9×10-6)含量,较低的Sr(14×10-6~44×10-6)、Ba(18×10-6~211×10-6)含量,在微量元素原始地幔标准化蛛网图上显示明显的Ba、Sr、P、Eu和Ti的负异常。以上特征表明道郎呼都格钾长花岗岩为A型花岗岩,为高温低压下长英质地壳的部分熔融及其后长石、榍石等的分离结晶作用的产物。结合区域构造演化,本文认为该区钾长花岗岩形成于板内伸展背景。在晚中生代期间,华北板块北缘的构造体制经历了重要的转变,由挤压体制转变为岩石圈减薄和地壳伸展,在伸展体制下,软流圈地幔上涌对上覆长英质地壳的直接加热作用促使其部分熔融形成该区A型花岗岩。 相似文献
7.
Absolute concentration of normal alkanes (n-alkanes) and aromatic hydrocarbons in bitumen extracted from source rocks in the period of thermodegradation from Turpan-Hami Basin suggests that aromatic hydrocarbons are dominant in coal and carbargilite while n-alkanes are dominant in mudstones. Bulkrock analysis and gas chromatograph/mass spectrum (GC-MS) of source rocks shows aromatic hydrocarbons are dominant in total ion chromatograms (TIC) of samples with poor perhydrous macerals while n-alkanes are dominant in TICs of samples with abundant perhydrous macerals. The identification of oil-prone and gas prone property based on GC-MS of bitumen “A” together with bulkrock analysis indicates that source rocks from Shengbei area are more oil-prone while source rocks from Qiudong and Xiaocaohu areas are more gas-prone, coinciding with the distribution of oil and gas reservoirs in Taibei Sag. Ratios used to identify oil-prone and gas-prone property for source rocks from Turpan Basin are proposed: n-alkanes >110 μg·mg?1, aromatics <15 μg·mg?1, and n-alkanes/aromatics >8 for oil-prone source rock bitumen while n-alkanes <82 μg·mg?1, aromatics >40 μg·mg?1, and n-alkanes/aromatics <1.5 for gas-prone source rock bitumen. 相似文献
8.
大量研究表明辽宁青城子地区主要成矿作用与印支期岩浆活动有密切关系,为了进一步研究印支期岩浆活动与成矿关系,文章在详细野外工作的基础上,对印支期侵入岩体进行了岩石地球化学测试分析。结果表明,青城子地区印支期花岗岩的w(SiO2)介于61.67%～77.69%,w(K2O)介于3.96%～6.67%,w(Na2O)为0.04%～4.42%,里特曼指数为0.57～5.19,多数小于3.3,主要为高钾钙碱性和钾玄岩系列;在以w(SiO2)为横坐标、其他氧化物为纵坐标的哈克图解中,除了w(Na2O)、w(K2O)与w(SiO2)的线性关系不明显外,其他氧化物均与w(SiO2)呈线性关系,说明它们具有明显的岩浆演化关系;微量元素均富集大离子亲石元素,亏损高场强元素,原始地幔标准化配分曲线呈右倾模式,稀土元素球粒陨石标准化配分模式呈轻稀土元素富集、重稀土元素亏损的右倾模式;构造判别图指示了青城子地区印支期岩浆活动产于同碰撞大地... 相似文献
9.
新疆西天山莱历斯高尔斑岩型铜钼矿床辉钼矿Re-Os同位素年龄及流体包裹体研究 总被引：6，自引：3，他引：3
莱历斯高尔斑岩型铜钼矿床位于依连哈比尔尕晚古生代残余洋盆和博罗霍洛早古生代岛弧的结合部位,矿体赋存于花岗闪长斑岩体内及岩体与围岩的接触带中。矿石中5件辉钼矿的Re-Os同位素模式年龄加权平均值为372.5±5.0Ma、等时线年龄为379.9±8.3Ma,表明莱历斯高尔铜钼矿床形成于晚泥盆世。石英中主要发育气液两相水溶液包裹体(W型)、含CO2三相包裹体(C型)及含子矿物多相包裹体(S型),并有少量纯CO2及纯CH4包裹体。成矿早阶段钾长石化花岗闪长斑岩石英斑晶中主要为W型包裹体,均一温度介于300~395℃之间,峰值为358~395℃,盐度介于7.59%~11.22%NaCleqv;主成矿阶段石英细脉中主要发育W型、C型和S型包裹体,并可见少量纯CO2包裹体,均一温度主要介于230~378℃,盐度变化较大,介于0.02%~52.00%NaCleqv;成矿晚阶段石英-方解石脉中仅见气液两相包裹体,均一温度介于118~241℃之间,盐度主要介于1.57%~9.54%NaCleqv。主成矿阶段流体包裹体类型多样、且具有相似的均一温度,指示流体沸腾现象的存在,其流体包裹体捕获温度为210~343℃,压力为17~59MPa,对应的成矿深度介于1.7~2.2km之间。成矿流体不混溶或沸腾作用是金属硫化物沉淀的主要机制。推测莱历斯高尔斑岩型铜钼矿床形成于晚泥盆世依连哈比尔尕残余洋盆向伊犁-中天山微板块之下俯冲的陆缘弧环境。 相似文献
10.
新疆西天山科克赛岩体年代学、地球化学及地质意义 总被引：7，自引：1，他引：6
新疆西天山科克赛岩体位于赛里木地块北部,岩石类型为二长花岗斑岩,属高钾钙碱性系列.元素地球化学组成表明,该二长花岗斑岩主量元素SiO2 、Al2O3和MgO含量分别为70.56％ ～71.46％、15.27％ ～16.01％和0.77％ ～ 1.02％;轻稀土元素富集,(La/Yb)N为14.99 ～23.69,重稀土元素亏损,δEu值显示弱负异常或正异常(0.88 ～1.21);微量元素Sr、Y和Yb含量分别为363×10-6 ～577×10-6、7.40×10-6～8.50×10-6和0.60×10-6 ～0.72×10-6.上述特征显示二长花岗斑岩具有埃达克岩的地球化学特征.同位素地球化学特征表明该二长花岗斑岩具有较低的锶初始值(ISr=0.705078 ～0.705572)、正的εNd(t)值(2.82 ～3.56)和相对年轻的两阶段Nd模式年龄(774 ～ 835 Ma).锆石LA-MC-ICP-MS U-Pb年龄为301.9±1.8Ma,表明岩体形成于晚石炭世末期.元素地球化学和同位素地球化学特征显示科克赛岩体为新元古代增生的地壳物质部分熔融的产物,形成于晚石炭世后碰撞初期阶段. 相似文献