【摘 要】
：
Due to the existence of water content in shale reservoir,it is quite meaningful to clarify the effect of water content on the methane adsorption capacity(MAC)of shale.However,the role of spatial configura-tion relationship between organic matter(OM)and cl
【机 构】
：
State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 10
论文部分内容阅读
Due to the existence of water content in shale reservoir,it is quite meaningful to clarify the effect of water content on the methane adsorption capacity(MAC)of shale.However,the role of spatial configura-tion relationship between organic matter(OM)and clay minerals in the MAC reduction process is still un-clear.The Silurian Longmaxi Formation shale samples from the Southern Sichuan Basin in China were pre-pared at five relative humidity(RH)conditions(0％,16％,41％,76％,99％)and the methane adsorption experiments were conducted on these water-bearing shale samples to clarify the MAC reduction process con-sidering the spatial configuration relationship between clay minerals and OM and establish the empirical model to fit the stages.Total organic carbon(TOC)content and mineral compositions were analyzed and the pore structures of these shale samples were characterized by field-emission scanning electron microscopy(FE-SEM),N2 adsorption and high-pressure mercury intrusion porosimetry(HPMIP).The results showed that the MAC reduction of clay minerals in OM occurred at different RH conditions from that of clay min-erals outside OM.Furthermore,the amount of MAC reduction of shale samples prepared at the same RH condition was negatively related with clay content,which indicated the protection role of clay minerals for the MAC of water-bearing shale samples.The MAC reduction process was generally divided into three stages for siliceous and clayey shale samples.And the MAC of OM started to decline during stage(1)for calcareous shale sample mainly because water could enter OM pores more smoothly through hydrophobic pathway pro-vided by carbonate minerals than through hydrophilic clay mineral pores.Overall,this study will contribute to improving the evaluation method of shale gas reserve.
其他文献
In recent years,significant progress in shale gas exploration has been achieved in the Upper Ordovician(Wufeng Formation)-Lower Silurian(Longmaxi Formation)shales in the Upper Yangtze area,South China.Although many studies have been carried out on the Upp
Sandy-conglomerate reservoir has gradually become a major target of oil and gas explora-tion.Complex diagenetic process and diagenetic fluid play a significant role in affecting reservoir hetero-geneity.Carbonate cements form at various stages of the diag
Natural fractures,as the main flow channels and important storage spaces,have significant effects on the migration,distribution,and accumulation of tight oil.According to outcrop,core,formation micro image(FMI),cast-thin-section,and scanning electron micr
The Lenghu area is one of the most crucial tectonic belts for oil and gas exploration in the Qaidam Basin.However,reservoir distribution and the factors controlling petroleum accumulation in this area have not been studied in detail.In this paper,the stru
Unconventional volcanic reservoir is different from conventional reservoir in reservoir space,diagenesis,pore formation and evolution.The Carboniferous volcanic reservoir was selected in Junggar Basin,Northwest China because based on sediment/rock cores a
Hydrocarbon source potential of the Paleogene Pabdeh Formation was studied by means of organic geochemistry and distribution of calcareous nannofossils.Based on the results,an Eocene-aged organic matter(OM)-rich interval was identified and traced across d
大柳泉地区F7断裂附近的沙三段和沙四段地层中发现大量油气,但F7断裂伴生裂缝对油气的输导作用尚不明确.基于F7断裂伴生裂缝及其分布特征建立F7断裂伴生裂缝输导油气能力定量评价方法.研究认为:F7断裂①号伴生裂缝和②号伴生裂缝输导油气能力评价参数平均值分别为186和8;F7断裂伴生裂缝输导油气能力评价参数在沙三上亚段为572、在沙三中亚段为176、在沙三下亚段为23、在沙四上亚段为5;平面上受F7断裂伴生裂缝输导油气能力控制,①号伴生裂缝输导油气能力相对较强、油气富集,②号伴生裂缝输导油气能力相对较弱、油气
Investigating the variation of water content in shale reservoir is important to understand shale gas enrichment and evaluate shale gas resource potential.Low water saturation is widely spread in Longmaxi marine organic-rich shale.To illustrate the formati
The Cenozoic basalts exposed in Bo Phloi Gem Field,Kanchanaburi Province,western Thailand are a host to different gem materials(e.g.,sapphire,black spinel,black pyroxene and zircon)as well as other xenocrysts and xenoliths from the deep-seated formations
The burial depth of the metamorphic buried hill of the Bozhong sag is more than 4 500 m,however,the controlling factors of the reservoirs are not clear.Based on cores and sidewall cores obtained from 15 wells,this paper describes the reservoir characteris