【摘要】：以渝東南綦江、南川、石柱及涪陵的龍馬溪組下部頁巖為例,通過X射線衍射、氬離子拋光-場發(fā)射掃描電鏡、TOC、脆性力學、高壓壓汞實驗、低溫氮吸附實驗等測試手段,綜合探明頁巖儲層礦物組分、有機質(zhì)特征、孔隙特征、力學脆性等巖石學特征,對儲層進行巖石學角度的評價,并討論巖石學特征對優(yōu)質(zhì)儲層形成的影響。結(jié)果顯示:龍馬溪組下部頁巖儲層巖石礦物組分可以分為以石英為主的脆性礦物和以伊利石為主的黏土礦物,底部脆性礦物含量更高;TOC平均值高于2%,達到過成熟階段;孔隙類型復雜,識別出有機質(zhì)納米孔、黏土礦物片狀孔、骨架礦物溶蝕孔等多種形貌-成因孔隙,納米孔提供了主要的比表面積和儲集空間;孔隙形貌復雜,發(fā)育平行板狀等多種形態(tài)類型;巖石力學脆性較好,有利于微裂隙發(fā)育與壓裂造縫。研究區(qū)龍馬溪組下部頁巖形成于深海陸棚相,經(jīng)歷了晚成巖作用階段,礦物組分適宜,納米孔、微裂隙發(fā)育,具有較好的力學脆性,是具有特殊巖石學特征的優(yōu)質(zhì)頁巖氣儲層。頁巖儲層的巖石物質(zhì)組成特征是優(yōu)質(zhì)儲層形成的基礎,從巖石學特征的角度對儲層展開研究,對探究頁巖儲層的物性成因及其受控因素具有重要意義。
[Abstract]:Taking the lower shale of Longmaxi formation in Qijiang, Nanchuan, Shizhu and Fuling of southeast Chongqing as examples, the petrological characteristics of shale reservoir are evaluated by means of X-ray diffraction, argon ion polishing and field emission scanning electron microscope, TOC, brittleness mechanics, high pressure mercury injection experiment and low temperature nitrogen adsorption experiment to comprehensively find out the petrological characteristics of shale reservoir, such as mineral composition, organic matter characteristics, pore characteristics, mechanical brittleness and so on. The influence of petrological characteristics on the formation of high quality reservoirs is also discussed. The results show that the rock mineral components of the lower shale reservoir of Longmaxi formation can be divided into brittle minerals dominated by quartz and clay minerals dominated by Illite, and the content of brittle minerals at the bottom is higher, the average value of TOC is higher than 2%, and reaches the overmature stage. The pore types are complex, and many kinds of morphologies, such as organic matter nanoporous, clay mineral flake pore, skeleton mineral dissolution pore and so on, are identified, which provide the main specific surface area and reservoir space; the pore morphology is complex and parallel plate shape is developed, and the rock mechanics brittleness is good, which is beneficial to the development of microfracture and fracturing fracture. The shale in the lower part of Longmaxi formation in the study area was formed in the deep-sea shelf phase and experienced late diagenetic stage. It has suitable mineral components, nano-pores and microfissures, and has good mechanical brittleness. It is a high quality shale gas reservoir with special petrological characteristics. The rock material composition characteristics of shale reservoir are the basis of high quality reservoir formation. It is of great significance to study the reservoir from the point of view of petrological characteristics in order to explore the physical origin and controlled factors of shale reservoir.
【作者單位】： 中國礦業(yè)大學資源與地球科學學院;煤層氣資源與成藏過程教育部重點實驗室;中國石油大學(北京)地球科學學院;河南理工大學資源環(huán)境學院;
【基金】：國家重點基礎研究發(fā)展計劃(973)項目(2012CB214702) 煤層氣資源與成藏過程教育部重點實驗室(中國礦業(yè)大學)開放基金資助項目(2015-007);中國礦業(yè)大學大學生創(chuàng)新訓練項目(201560)
【分類號】：P618.13

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