Shallow-level igneous intrusions are a common feature of many sedimentary basins, and there is increased recognition of the syn-emplacement deformation structures in the host rock that help to accommodate this magma addition. However, the sub-seismic structure and reservoir-scale implications of igneous intrusions remain poorly understood. The Trachyte Mesa intrusion is a small (∼1.5 km²), NE–SW trending satellite intrusion to the Oligocene-age Mount Hillers intrusive complex in the Henry Mountains, Utah. It is emplaced within the highly porous, aeolian Entrada Sandstone Formation (Jurassic), producing a network of conjugate sets of NE–SW striking deformation bands trending parallel to the intrusion margins. The network was characterized by defining a series of nodes and branches, from which the topology, frequency, intensity, spacing, characteristic length, and dimensionless intensity of the deformation band traces and branches were determined. These quantitative geometric and topological measures were supplemented by petrological, porosity and microstructural analyses. Results show a marked increase in deformation band intensity and significant porosity reduction with increasing proximity to the intrusion. The deformation bands are likely to impede fluid flow, forming barriers and baffles within the Entrada reservoir unit. A corresponding increase in Y- and X-nodes highlights the significant increase in deformation band connectivity, which in turn will significantly reduce the permeability of the sandstone. This study indicates that fluid flow in deformed host rocks around igneous bodies may vary significantly from that in the undeformed host rock. A better understanding of the variability of deformation structures, and their association with intrusion geometry, will have important implications for industries where fluid flow within naturally fractured reservoirs adds value (e.g. hydrocarbon reservoir deliverability, hydrology, geothermal energy and carbon sequestration).

中文翻译：

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与犹他州亨利山脉的Trachyte Mesa侵入有关的形变带分析：对油藏连通性和基岩侵入周围流体流动的影响

浅层火成岩侵入是许多沉积盆地的共同特征，人们对基质岩中同位变形构造的认识得到了增强，这些构造有助于适应岩浆的增加。但是，对火成岩侵入的亚地震构造和储层规模的影响仍然知之甚少。Trachyte Mesa侵入很小（〜1.5  km ²），NE–SW趋向卫星入侵犹他州亨利山脉的渐新世时代的Hillers侵入综合体。它被放置在高孔隙度的风成因恩达（Entrada）砂岩地层（侏罗纪）中，形成了一个NE-SW共轭组网络，这些共轭组具有与侵入边界平行的走向的变形带。该网络的特征是定义了一系列节点和分支，由此确定了变形带迹线和分支的拓扑，频率，强度，间距，特征长度和无量纲强度。这些定量的几何和拓扑度量得到岩石学，孔隙度和微观结构分析的补充。结果表明，随着侵入距离的增加，变形带强度显着增加，孔隙率显着降低。变形带很可能会阻碍流体流动，从而在Entrada储层单元内形成障碍和挡板。Y节点和X节点的相应增加突出显示了变形带连通性的显着增加，这反过来将显着降低砂岩的渗透性。这项研究表明，火成岩周围变形的宿主岩中的流体流动可能与未变形的宿主岩中的流体明显不同。更好地了解变形结构的变异性及其与侵入几何学的联系，对自然裂缝储层中的流体流增加了价值的行业（例如，油气藏的可输送性，水文学，地热能和碳固存）具有重要意义。在Entrada水库单元内形成屏障和挡板。Y节点和X节点的相应增加突出显示了变形带连通性的显着增加，这反过来将显着降低砂岩的渗透性。这项研究表明，火成岩周围变形的宿主岩中的流体流动可能与未变形的宿主岩中的流体明显不同。更好地了解变形结构的变异性及其与侵入几何学的联系，对自然裂缝储层中的流体流增加了价值的行业（例如，油气藏的可输送性，水文学，地热能和碳固存）具有重要意义。在Entrada水库单元内形成屏障和挡板。Y节点和X节点的相应增加突出显示了变形带连通性的显着增加，这反过来将显着降低砂岩的渗透性。这项研究表明，火成岩周围变形的宿主岩中的流体流动可能与未变形的宿主岩中的流体明显不同。更好地了解变形结构的变异性及其与侵入几何学的联系，对自然裂缝储层中的流体流增加了价值的行业（例如，油气藏的可输送性，水文学，地热能和碳固存）具有重要意义。反过来会大大降低砂岩的渗透性。这项研究表明，火成岩周围变形的宿主岩中的流体流动可能与未变形的宿主岩中的流体明显不同。更好地了解变形结构的变异性及其与侵入几何学的联系，对自然裂缝储层中的流体流增加了价值的行业（例如，油气藏的可输送性，水文学，地热能和碳固存）具有重要意义。反过来会大大降低砂岩的渗透性。这项研究表明，火成岩周围变形的宿主岩中的流体流动可能与未变形的宿主岩中的流体明显不同。更好地了解变形结构的变异性及其与侵入几何学的联系，对自然裂缝储层中的流体流增加了价值的行业（例如，油气藏的可输送性，水文学，地热能和碳固存）具有重要意义。