挤压应力对川东渝南龙马溪组页岩孔隙的影响
发布时间：2018-07-13 19:53
【摘要】：湘西渝南隔槽式褶皱向川东隔挡式褶皱推进,地层具有递进衰减变形的特征,所受挤压应力逐渐衰减。为探究挤压力强弱对页岩孔隙的影响程度,应用高压压汞法和低温液氮法测定了川东渝南不同地区龙马溪组页岩样品的孔隙特征。研究表明:强烈的挤压应力会加剧孔隙压实及黏土矿物转化,对大孔及微裂隙的破坏明显;挤压应力造成地层隆升,导致页岩地层受热,生烃时间产生差异,微孔、介孔发育受影响;滑脱面和储层超压在一定程度上加剧或缓冲挤压应力对页岩储层的破坏。受挤压应力改造后的页岩储层能较好地控制油气的扩散及渗流,且微、介孔的发育可为页岩气吸附提供大量空间,影响页岩气的赋存富集。该研究结合中上扬子地台构造应力学特征及页岩储层特征,为研究南方海相页岩的赋存富集提供了科学依据。
[Abstract]:The cross-channel fold in Yunan of Xiangxi is advancing to the blocking fold in East Sichuan. The strata have the characteristics of progressive attenuation and deformation, and the compressive stress is gradually decreasing. In order to investigate the influence of extrusion pressure on shale porosity, the pore characteristics of shale samples of Longmaxi formation in different areas of Yunan Sichuan were measured by high pressure mercury injection method and low temperature liquid nitrogen method. The results show that the strong extrusion stress will aggravate pore compaction and clay mineral transformation, and destroy the macropores and microcracks obviously, and the extrusion stress will cause strata uplift, which will lead to the heat of shale formation and the difference of hydrocarbon generation time. The development of mesoporous is affected, and the overpressure of slip surface and reservoir intensifies or buffers extrusion stress to some extent to destroy shale reservoir. The shale reservoir modified by extrusion stress can control the diffusion and percolation of oil and gas well, and the development of mesoporous can provide a large amount of space for shale gas adsorption and affect the occurrence and enrichment of shale gas. This study combined with the structural mechanics and shale reservoir characteristics of the Meso-Upper Yangtze platform provides a scientific basis for the study of the occurrence and enrichment of marine shale in southern China.
【作者单位】： 中国矿业大学;煤层气资源与成藏过程教育部重点实验室;
【基金】：国家基础研究发展计划“中国南方古生界页岩气赋存富集机理和资源潜力评价”(2012CB214702) 国家自然科学基金“中上扬子地区龙马溪组页岩微孔结构演变与页岩气成藏效应”(41272155)
【分类号】：P618.13
本文编号：2120560
[Abstract]:The cross-channel fold in Yunan of Xiangxi is advancing to the blocking fold in East Sichuan. The strata have the characteristics of progressive attenuation and deformation, and the compressive stress is gradually decreasing. In order to investigate the influence of extrusion pressure on shale porosity, the pore characteristics of shale samples of Longmaxi formation in different areas of Yunan Sichuan were measured by high pressure mercury injection method and low temperature liquid nitrogen method. The results show that the strong extrusion stress will aggravate pore compaction and clay mineral transformation, and destroy the macropores and microcracks obviously, and the extrusion stress will cause strata uplift, which will lead to the heat of shale formation and the difference of hydrocarbon generation time. The development of mesoporous is affected, and the overpressure of slip surface and reservoir intensifies or buffers extrusion stress to some extent to destroy shale reservoir. The shale reservoir modified by extrusion stress can control the diffusion and percolation of oil and gas well, and the development of mesoporous can provide a large amount of space for shale gas adsorption and affect the occurrence and enrichment of shale gas. This study combined with the structural mechanics and shale reservoir characteristics of the Meso-Upper Yangtze platform provides a scientific basis for the study of the occurrence and enrichment of marine shale in southern China.
【作者单位】： 中国矿业大学;煤层气资源与成藏过程教育部重点实验室;
【基金】：国家基础研究发展计划“中国南方古生界页岩气赋存富集机理和资源潜力评价”(2012CB214702) 国家自然科学基金“中上扬子地区龙马溪组页岩微孔结构演变与页岩气成藏效应”(41272155)
【分类号】：P618.13
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