Moscow University Geology Bulletin ( IF 0.3 ) Pub Date : 2022-04-14 , DOI: 10.3103/s0145875222010161 D. E. Zagranovskaya 1 , S. I. Isaeva 1 , A. P. Vilesov 1 , V. A. Shashel 1 , O. A. Zakharova 1 , E. O. Belaykov 1 , V. Y. Demin 2 , I. L. Kudin 2 , G. A. Kalmykov 3
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Abstract
The properties of unconventional prospective deposits are interconnected by the processes of reservoir formation and oil and gas formation. Dispersed dolomite formed in situ during the maturation of TOC from syngenetic magnesium in the rock matrix increases the pore space of the rock, thereby forming an unconventional reservoir filled with autochthonous hydrocarbons and oil components. In the process of TOC maturation and hydrocarbon migration the TOC components are redistributed in the pore space; the released volume of rocks is thus filled with stationary resinous asphaltene substances, which sharply reduces the reservoir properties of unconventional reservoirs. As a result, the definition of “organic” porosity includes a broader concept than just the porosity of kerogen. This is a more complex physicochemical process of transformation of the organic matter itself and the redistribution of elements within the formation as a result of the maturation of TOC components and hydrocarbon migration. When assessing the oil and gas potential in the section we distinguish three groups of rocks: unconventional reservoirs with an increased TOC content and the presence of mobile hydrocarbons; bituminous rocks, in which part of the pore volume is filled with resinous-asphaltene substances, and host dense carbonate rocks without organic matter. As well, sporadically developed traditional reservoirs are distinguished throughout the section of the Domanik type rocks.
中文翻译：
Domanik组连续储层结构及岩石物理解释方法
摘要
非常规远景矿床的性质通过成藏过程和油气形成过程相互关联。岩石基质中的同生镁在 TOC 成熟过程中原位形成的分散白云石增加了岩石的孔隙空间，从而形成了充满原生烃和石油成分的非常规储层。在 TOC 成熟和油气运移过程中，TOC 组分在孔隙空间中重新分布；因此，释放的岩石体积中充满了静止的树脂沥青质物质，这大大降低了非常规储层的储层特性。因此，“有机”孔隙度的定义包括比干酪根孔隙度更广泛的概念。这是一个更复杂的物理化学过程，即有机质本身的转化和由于 TOC 组分的成熟和烃类迁移导致地层内元素的重新分布。在评估该部分的油气潜力时，我们区分了三组岩石：TOC 含量增加的非常规储层和流动碳氢化合物的存在；沥青岩，其中部分孔隙体积充满树脂-沥青质物质，并含有致密的碳酸盐岩，不含有机物。同样，在 Domanik 型岩石的整个剖面中都可以看到零星发育的传统储层。在评估该部分的油气潜力时，我们区分了三组岩石：TOC 含量增加的非常规储层和流动碳氢化合物的存在；沥青岩，其中部分孔隙体积充满树脂-沥青质物质，并含有致密的碳酸盐岩，不含有机物。同样，在 Domanik 型岩石的整个剖面中都可以看到零星发育的传统储层。在评估该部分的油气潜力时，我们区分了三组岩石：TOC 含量增加的非常规储层和流动碳氢化合物的存在；沥青岩，其中部分孔隙体积充满树脂-沥青质物质，并含有致密的碳酸盐岩，不含有机物。同样，在 Domanik 型岩石的整个剖面中都可以看到零星发育的传统储层。
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