發(fā)布時(shí)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(jìn),地層具有遞進(jìn)衰減變形的特征,所受擠壓應(yīng)力逐漸衰減。為探究擠壓力強(qiáng)弱對(duì)頁(yè)巖孔隙的影響程度,應(yīng)用高壓壓汞法和低溫液氮法測(cè)定了川東渝南不同地區(qū)龍馬溪組頁(yè)巖樣品的孔隙特征。研究表明:強(qiáng)烈的擠壓應(yīng)力會(huì)加劇孔隙壓實(shí)及黏土礦物轉(zhuǎn)化,對(duì)大孔及微裂隙的破壞明顯;擠壓應(yīng)力造成地層隆升,導(dǎo)致頁(yè)巖地層受熱,生烴時(shí)間產(chǎn)生差異,微孔、介孔發(fā)育受影響;滑脫面和儲(chǔ)層超壓在一定程度上加劇或緩沖擠壓應(yīng)力對(duì)頁(yè)巖儲(chǔ)層的破壞。受擠壓應(yīng)力改造后的頁(yè)巖儲(chǔ)層能較好地控制油氣的擴(kuò)散及滲流,且微、介孔的發(fā)育可為頁(yè)巖氣吸附提供大量空間,影響頁(yè)巖氣的賦存富集。該研究結(jié)合中上揚(yáng)子地臺(tái)構(gòu)造應(yīng)力學(xué)特征及頁(yè)巖儲(chǔ)層特征,為研究南方海相頁(yè)巖的賦存富集提供了科學(xué)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(guó)礦業(yè)大學(xué);煤層氣資源與成藏過(guò)程教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家基礎(chǔ)研究發(fā)展計(jì)劃“中國(guó)南方古生界頁(yè)巖氣賦存富集機(jī)理和資源潛力評(píng)價(jià)”(2012CB214702) 國(guó)家自然科學(xué)基金“中上揚(yáng)子地區(qū)龍馬溪組頁(yè)巖微孔結(jié)構(gòu)演變與頁(yè)巖氣成藏效應(yīng)”(41272155)
【分類號(hào)】：P618.13

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