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首页> 外文期刊>Facies >Lacustrine microporous micrites of the Madrid Basin (Late Miocene, Spain) as analogues for shallow-marine carbonates of the Mishrif reservoir Formation (Cenomanian to Early Turonian, Middle East)
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Lacustrine microporous micrites of the Madrid Basin (Late Miocene, Spain) as analogues for shallow-marine carbonates of the Mishrif reservoir Formation (Cenomanian to Early Turonian, Middle East)

机译：马德里盆地（西班牙中新世晚期）的Lacustrine微孔微晶岩，类似于Mishrif油藏组（西诺曼尼亚至早期土伦期）的浅海碳酸盐岩

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Shallow-marine microporous limestones account for many carbonate reservoirs. Their formation, however, remains poorly understood. Due to the lack of recent appropriate marine analogues, this study uses a lacustrine counterpart to examine the diagenetic processes controlling the development of intercrystalline microporosity. Late Miocene lacustrine microporous micrites of the Madrid Basin (Spain) have a similar matrix microfabric as Cenomanian to Early Turonian shallow-marine carbonates of the Mishrif reservoir Formation (Middle East). The primary mineralogy of the precursor mud partly explains this resemblance: low-Mg calcites were the main carbonate precipitates in the Cretaceous seawater and in Late Miocene freshwater lakes of the Madrid Basin. Based on hardness and petrophysical properties, two main facies were identified in the lacustrine limestones: a tight facies and a microporous facies. The tight facies evidences strong compaction, whereas the microporous facies does not. The petrotexture, the sedimentological content, and the mineralogical and chemical compositions are identical in both facies. The only difference lies in the presence of calcite overgrowths: they are pervasive in microporous limestones, but almost absent in tight carbonates. Early diagenetic transformations of the sediment inside a fluctuating meteoric phreatic lens are the best explanation for calcite overgrowths precipitation. Inside the lens, the dissolution of the smallest crystals in favor of overgrowths on the largest ones rigidifies the sediment and prevents compaction, while partly preserving the primary microporous network. Two factors appear essential in the genesis of microporous micrites: a precursor mud mostly composed of low-Mg calcite crystals and an early diagenesis rigidifying the microcrystalline framework prior to burial.
机译：浅海微孔石灰岩占许多碳酸盐岩储层。然而，它们的形成仍然知之甚少。由于缺乏合适的海洋类似物，本研究使用湖相对应物来检查控制晶间微孔发展的成岩过程。马德里盆地（西班牙）的中新世晚期湖相微孔微晶岩具有与西诺曼期相似的基质微结构，与米什里夫储层（中东）的早期土伦浅海碳酸盐相一致。前体泥的主要矿物学部分解释了这一相似之处：低镁方解石是马德里盆地白垩纪海水和中新世晚期淡水湖中的主要碳酸盐沉淀。基于硬度和岩石物性，在湖相石灰岩中确定了两个主要相：致密相和微孔相。紧密的相表明强烈的压实作用，而微孔的相则没有。两种相的岩石纹理，沉积学含量以及矿物学和化学组成都相同。唯一的区别在于方解石的过度生长：它们普遍存在于微孔石灰岩中，而在紧密碳酸盐中几乎不存在。波动的潜水透镜内部沉积物的早期成岩作用转变是方解石过度生长沉淀的最佳解释。在晶状体内部，最小晶体的溶解有利于最大晶体上的过度生长，从而使沉积物硬化并防止压实，同时部分保留了主要的微孔网络。在微孔微晶矿的成因中似乎有两个重要的因素：一种主要由低镁方解石晶体组成的前驱泥浆，以及一个早期成岩作用，在埋藏前使微晶骨架变硬。

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