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首页> 外文期刊>Frontiers of earth science >Geological controls of shale gas accumulation and enrichment mechanism in Lower Cambrian Niutitang Formation of western Hubei, Middle Yangtze, China
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Geological controls of shale gas accumulation and enrichment mechanism in Lower Cambrian Niutitang Formation of western Hubei, Middle Yangtze, China

机译：中国湖北省湖北省下寒武纪NiutiItang组的页岩气累积和富集机理的地质控制

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摘要

The lower Cambrian Niutitang Formation is of crucial importance for shale gas target reservoirs in western Hubei, China; however, little work has been done in this field, and its shale gas accumulation and enrichment mechanism are still unclear. Based on survey wells, outcrop data, and large numbers of tests, the geological conditions of shale gas accumulation were studied; moreover, the factors that influence the gas content were thoroughly discussed. The results show that the Niutitang Formation (?(1)n) can be divided into three sections: the first section (?(1)n(1)), the second section (?(1)n(2)), and the third section (?(1)n(3)). The ?(1)n(2) is the main shale gas reservoir. The deep shelf facies is the main sedimentary facies and can be divided into three main lithofacies: argillaceous siltstone, carbonaceous shale and carbonaceous siliceous rock. The total organic carbon (TOC) content shows gentle growth trends until bottom of the ?(1)n(2) and then decreases rapidly within the ?(1)n(1), and the TOC content mainly ranges from 2% to 4% horizontally. The calcite and dolomite dissolution pores, clay intergranular pores and organic pores are the main pore types and the micropore types are clearly related to the mineral compositions and the TOC content. Vertically, the gas content is mainly affected by the TOC content. Horizontally, wells with high gas contents are distributed only southeast of the Huangling anticline, and the combination of structural styles, fault and fracture development, and the distribution of the regional unconformity boundary between the upper Sinian Dengying Formation (Z(2)d) and the ?(1)n(2) are the three most important factors affecting the gas content. The favorable areas must meet the following conditions: a deep shelf environment, the presence of the ?(1)n(1), wide and gentle folds, far from large normal faults that are more than 5 km, moderate thermal evolution, and greater than 500 m burial depth; this includes the block with the YD2-ZD2 wells, and the block with the Y1 and YD4 wells, which are distributed in the southern portion of the Huangling anticline and northern portion of the Xiannvshan fault.
机译：下寒武纪Niutiitang组对中国湖北部的页岩气目标水库至关重要;但是，在这一领域已经完成了一点工作，其页岩气体积聚和富集机制仍然不清楚。基于调查井，露头数据和大量测试，研究了页岩气累积的地质条件;此外，彻底讨论了影响煤气含量的因素。结果表明，Niutitang地层（α（1）n）可分为三个部分：第一部分（？（1）n（1）），第二部分（？（1）n（2）），和第三部分（？（1）n（3））。 ？（1）n（2）是主要页岩气藏。深层架子面是主要沉积相，可分为三个主要的岩岩：泥石石，碳质页岩和碳质硅质岩石。总有机碳（TOC）含量显示温和的生长趋势，直到α（1）N（2）底部，然后在α（1）n（1）内快速降低，TOC含量主要为2％至4 ％水平。方解石和白云石溶出孔，粘土骨髓孔和有机孔是主要的孔隙类型，微孔类型与矿物组合物和TOC含量明显相关。垂直地，气体含量主要受到TOC含量的影响。水平，具有高气体含量的井只分布黄岭斜倚线的东南，以及结构风格，故障和断裂发育的组合，以及地区简陋的地层（Z（2）D）之间的区域不整合边界的分布？（1）N（2）是影响煤气含量的三个最重要因素。有利的区域必须符合以下条件：深度货架环境，存在？（1）n（1），宽和柔和的褶皱，远远距离大于5公里，温和的热量进化，更大超过500米的埋葬深度;这包括具有YD2-ZD2孔的块，以及带Y1和YD4孔的块，其分布在黄岭斜线和Xiannvshan故障的北部的南部。

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