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首页> 外文会议>SPE Latin American and Caribbean Petroleum Engineering Conference >Chemostratigraphical Characterization of Stratigraphic Sequences: Upper B Sandstones of Eocene Misoa Formation, Maracaibo Basin, Western Venezuela
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Chemostratigraphical Characterization of Stratigraphic Sequences: Upper B Sandstones of Eocene Misoa Formation, Maracaibo Basin, Western Venezuela

机译：地层序列的化学读物表征：委内瑞拉西部Maracaibo Basin的Himene Misoa Changation上B砂岩

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The Misoa Formation (Eocene) is characterized by a monotonous succession of sandstones and shales with scarce faunal content. This unit has been divided into several operational bodies based on its lithological, electric and radioactive log character. Its rich oil content, expressed in the wells studied in the area, leads to the need for a better knowledge and understanding of its stratigraphic development, in order to enhance its exploitation. This works is focus on the upper informal units (Bl, B2, B3, B4 and B5) where their lithological content of interbedded sandstones and shales, make difficult to generate accurate chronostratigraphic correlations. Chemical analysis of 298 samples from three wells were developed to establish concentrations of major (wt%) chemical elements expressed in oxide SiO2, TiO2, A12O3, Fe2O3, MnO, CaO, MgO, Na2O, K2O, P2O5, minor and trace elements (ppm) Ba, Ce, Co, Cu, La, Mo, V, S, Sn, Rb, Sr, Zr, Y, Cr, Ni, Pb and Zn, by using optical emission spectrometry with inductively coupled plasma (ICP-OES). In addition, mutivariate statistical analysis was undertaken to conduct chemical characterization of informal units for each well. The use of inter-elemental ratio (V/Al) and V/(V+Ni) help to define maximum flooding surfaces (MFS) and flooding surfaces (FS), allowing to confirm the MFS-43 previously defined by seismic correlation in the study area. These results point out those B-informal units have higher geochemical fingerprint that can be chemically correlated and used in other areas of interest at this level of the Misoa Formation. This method probe to be a valuable tool, to be applied reliably statistically in siliciclastic sequences with little or no biostratigraphic control in order to reduce the uncertainty of the stratigraphic model, also this method contributes to the definition of high-frequency stratigraphic surfaces (thirth, fourth, fifth and up to sixth order).
机译：Misoa形成（eocene）的特点是单调连续的砂岩和诸如稀缺群含量的桑克斯和罗萨。本机已划分为几个操作体，基于其岩性，电动和放射性日志字符。其丰富的石油含量在该地区研究的井中表达，导致需要更好地了解其地层发展的知识和理解，以提高其剥削。这项工作专注于上非非正式单元（BL，B2，B3，B4和B5），其中壁板和Shales的岩性含量，难以产生准确的计时性相关性。制定了来自三个孔的298个样品的化学分析，以建立氧化物SiO2，TiO 2，A12O3，Fe 2 O 3，MNO，CaO，MgO，Na 2 O，K 2 O，P2O5，次要和微量元素和微量元素（PPM）的主要（WT％）化学元素的浓度（ppm ）通过使用具有电感耦合等离子体（ICP-OES）的光发射光谱法（ICP-OES），BA，Ce，Cu，Cu，La，Mo，V，S，Sn，Rb，Sr，Zr，Y，Cr，Ni，Pb和Zn。此外，进行了统计分析，以对每个井进行非正式单位的化学表征。使用间质间比（V / Al）和V /（V + Ni）有助于定义最大泛洪表面（MF）和泛洪表面（FS），允许确认先前通过地震相关性定义的MFS-43研究区。这些结果指出那些B-Informal单元具有更高的地球化学指纹，可以在这种水平的Misoa形成水平的其他感兴趣领域中使用。该方法探测是一个有价值的工具，待统计上的硅基序列，少数或没有生物数据库控制，以减少地层模型的不确定性，这种方法也有助于定义高频地层表面（Thrith，第四，第五，最多六阶）。

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