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首页> 外文会议>Abu Dhabi International Petroleum Exhibition Conference >Reservoir-Scale Characterisation and Prediction of Microporous Limestones. Example the Arab Formation Upper Jurassic, Onshore United Arab Emirates
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Reservoir-Scale Characterisation and Prediction of Microporous Limestones. Example the Arab Formation Upper Jurassic, Onshore United Arab Emirates

机译：微孔石灰岩的储层规模特征与预测。 示例阿拉伯地层上部侏罗纪，陆上阿拉伯联合酋长国

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In the onshore sector of the United Arab Emirates, the Lower Arab D Member (Kimmeridgian) typically encompasses a thick succession of rather homogeneous low-energy mid-ramp carbonate mudstones interbedded with minor storm-induced cm-scale skeletal-rich floatstones. Within these deposits, the pore volume is dominated by locally abundant matrix-hosted micropores, along with variably abundant open to partially cemented fractures, primary intraparticle macropores and rare moulds and vugs. As a result of this variably developed pore system, measured porosity varies from poor to very good, while permeability changes from extremely poor to rarely good. Detailed petrographic observations (thin-sections, SEM) carried out within six cored wells in a sour gas reservoir highlight that the variations in reservoir properties are primarily linked to the micron-scale variations in the micritic fabric. Indeed, anhedral compact micrites with coalescent intercrystalline contacts are associated with very small and poorly connected micropores, while polyhedral to subrounded micrites with facial to subpunctic intercrystalline contacts show locally well-developed micropores and therefore better reservoir potential. δ(18)~O and δ(13)~C isotope measurements do not discriminate both micritic fabrics, indicating a recrystallisation of the matrix within shallow burial conditions. However, bulk XRF measurements, and especially SiO2, Al2O3 and Fe2O3 content indicate that poorly porous anhedral compact micrite host more insoluble material and have been prone to a greater compaction compared to porous polyhedral micrites. Log-derived elastic properties, including Young's Modulus (YME) along with porosity data, have been used in two wells to explore the potential relationship between micritic fabric, porosity, permeability and elastic properties. With the evolution of micritic fabric from anhedral compact to polyhedral / subrounded, Young's Modulus decreases with increasing porosity, indicating a decrease in the overall stiffness of the rock. Based on these two learning wells, specific porosity and YME cut-offs have been identified to discriminate the various micrite fabrics. Those cut-offs have been successfully tested in four other wells used as a blind test for the vertical prediction of the micritic fabrics, in which accurate predictions reached up to 90%. Following these results, porosity and YME cut-offs have been used to produce the first model of the distribution of the various micritic fabrics at the field-scale. These results have a fundamental impact on how sedimentologically homogenous microporous limestones can be described and predicted at the well and field-scales, especially in the context of exploring tight carbonate plays associated with intrashelf basins.
机译：在阿拉伯联合酋长国的陆军部门，中下游的成员（KimMeridgian）通常包括相当均匀的低能量中坡碳酸盐泥粘土，伴随着轻微的风暴诱导的CM型富含富含CM型骨质富含骨质浮石。在这些沉积物中，孔体积由局部丰富的基质托管微孔支配，以及可变地露天度，以部分粘合的骨折，初级骨质碎屑和罕见的模具和Vugs。由于这种可变发达的孔系统，测量的孔隙率因差而异，而渗透率从极差变化到很少。在酸性气体储层中的六个芯井内进行详细的岩体观测（薄膜，SEM）突出显示储层性能的变化主要与微米织物中的微米级变化相关联。实际上，具有结合结合的细胞间触点的AnheDral Compact Micrines与非常小且相连的微孔相关，而具有面部的多面体与副的微孔与副间介质触点​​有关，显示出局部发育良好的微孔，从而更好地储层潜力。 δ（18）〜O和δ（13）〜C同位素测量不区分微谱织物，表明在浅埋条件下的基质的重结晶。然而，Bulk XRF测量，特别是SiO 2，Al 2 O 3和Fe 2 O 3含量表明，与多孔多面体微型微管相比，多孔的AnheDral Compact Micrite主体更加不溶性材料，并且易于压实更大。在两个孔中使用了在两个孔中使用杨氏模量（YME），包括杨氏模量（YME），以探讨微织物，孔隙率，渗透率和弹性性质之间的潜在关系。随着微谱织物的演变，来自AnheDral Compact到多面体/次脑的，杨氏模量随着孔隙率的增加而降低，表明岩石的整体刚度降低。基于这两个学习井，已经识别出特定的孔隙率和YME截止措施以区分各种微型织物。这些截止已经成功地测试了四个其他井，用作微谱织物的垂直预测的盲试验，其中精确的预测达到90％。遵循这些结果，已经使用孔隙率和YME截止物来产生在场尺度下的各种微谱织物的分布的第一模型。这些结果对如何在井和场尺度描述和预测如何描述和预测沉积物同质均匀的微孔石灰岩的根本影响，尤其是在探索与薄壁盆地相关的紧密碳酸盐族的背景下。

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