Characteristics And Its Correlation With Oil Of Analcimes Of The Permian Pingdiquan Formation In The East Of Junggar Basin And Lucaogou Formation In The Jimusar Sag,Xingjiang

Analcime is a kind of rich sodium aluminum silicate minerals,the ideal structure of the chemical formula for Na16Al16Si32O96·16H2O,can be formed in the sedimentary rock,volcanic rock and various genetic types of rock,often with other zeolite mineral assemblage.Analcite extensively in the western region in China,the cementation facies of authigenic zeolite has been reported literature,most of them on its mechanism on diagenesis and meaning,and other types of analcime rarely reported.The author's research team found in the study of the northern xinjiang in recent years on the abundant analcime,according to the research team in eastern junggar anticline Permian series in the ground fire mountain springs group and jimusar sag of the middle Permian LuCaoGou group research,combined with rock thin section,X-ray diffraction,electron probe and other methods,the LuCaoGou group characteristics and genetic analysis of analcime discourses and discussion.Through core observation,microscopic identification and the methods of X-ray diffraction,on lithology classification standards,combining with the content of analcime,we will study area Permian flat springs group and LuCaoGou lithology is divided into tuff,low limestone,tuffaceous dolomite,dolomite,limestone,sandstone and analcite rocks(analcime content>25%).Different rock types of the zeolite content and distribution:there exist certain differences analcime mainly exists in low limestone,the average content of about 7%;Tuff China's uneven distribution of zeolite,and the average content of about 3.9%,21 samples only eight samples containing analcime,up to 23.1%.Several other lithologic China zeolite content is a huge difference,which is about 6%.Through the microscopic,scanning electron microscopy(sem)and back scattering image observation,we think research OuDeFang zeolite on the macro to the form,and a half since the form and its three forms.Automorphic extent better analcime again according to its occurrence scattered into granular structure,porphyritic and vein;Half euhedral analcime is given priority to with dispersive granular and crumb;Its shape analcime shows cementation and filling.Analcite main chemical composition in the study area slightly different,the content of Si02 in fire area is about 59.6%,jimusar area is about 62.3%,and the content of A1203 and content of Na20 approximation,respectively,in between 19%?23%and 5.3%?10.4%,average analcime Si/Al 2.57 and 2.58,respectively,but the fire mountain floating is bigger,the minimum is 2.22,the maximum is 2.83-acid volcanic rocks in this suggests analcite from relevant and the cause of the fire mountain analcime is more complicated:there are native analcime participation.Analcite distribution and area of oil and gas shows presents a good compatibility,and the change trend of analcime content and porosity,permeability change trend of roughly the same.Analcite effect on the physical property of reservoir is embodied in:on the one hand,the existence of analcime increased the reservoir permeability and porosity,which is beneficial to form the advantages of the reservoir,on the other hand analcime formed in the early stage of buried,have the effect of the compaction resistance,so the interparticle primary pore preservation of abundant.