擠壓應力對川東渝南龍馬溪組頁巖孔隙的影響
發(fā)布時間：2018-07-13 19:53
【摘要】：湘西渝南隔槽式褶皺向川東隔擋式褶皺推進,地層具有遞進衰減變形的特征,所受擠壓應力逐漸衰減。為探究擠壓力強弱對頁巖孔隙的影響程度,應用高壓壓汞法和低溫液氮法測定了川東渝南不同地區(qū)龍馬溪組頁巖樣品的孔隙特征。研究表明:強烈的擠壓應力會加劇孔隙壓實及黏土礦物轉(zhuǎn)化,對大孔及微裂隙的破壞明顯;擠壓應力造成地層隆升,導致頁巖地層受熱,生烴時間產(chǎn)生差異,微孔、介孔發(fā)育受影響;滑脫面和儲層超壓在一定程度上加劇或緩沖擠壓應力對頁巖儲層的破壞。受擠壓應力改造后的頁巖儲層能較好地控制油氣的擴散及滲流,且微、介孔的發(fā)育可為頁巖氣吸附提供大量空間,影響頁巖氣的賦存富集。該研究結(jié)合中上揚子地臺構(gòu)造應力學特征及頁巖儲層特征,為研究南方海相頁巖的賦存富集提供了科學依據(jù)。
[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.
【作者單位】： 中國礦業(yè)大學;煤層氣資源與成藏過程教育部重點實驗室;
【基金】：國家基礎(chǔ)研究發(fā)展計劃“中國南方古生界頁巖氣賦存富集機理和資源潛力評價”(2012CB214702) 國家自然科學基金“中上揚子地區(qū)龍馬溪組頁巖微孔結(jié)構(gòu)演變與頁巖氣成藏效應”(41272155)
【分類號】：P618.13
本文編號：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.
【作者單位】： 中國礦業(yè)大學;煤層氣資源與成藏過程教育部重點實驗室;
【基金】：國家基礎(chǔ)研究發(fā)展計劃“中國南方古生界頁巖氣賦存富集機理和資源潛力評價”(2012CB214702) 國家自然科學基金“中上揚子地區(qū)龍馬溪組頁巖微孔結(jié)構(gòu)演變與頁巖氣成藏效應”(41272155)
【分類號】：P618.13
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