Study on pore structure and heterogeneous features of shale in Wufeng Formation-Longmaxi Formation

in order to detect and study the pore features and micro heterogeneous features of the shale reservoir in wireng Formation-LongmnaxiFormation,basedon the samples from Wwufeng Formation-Longmaxi Formation in Chongging Nanchuan and aijing as the exampes the argon ion fgurn -rfed emiss io scamning electon microcopy.high pressure mercury,cryogenic nitrogen adsorption and other experiment techrica means were appied to the obsenvtion and analys s n the pore features of the shale reservoir. The pore structre develogment and distrbution features were sumarzed and the micro-scale heterogeneity of th shale reservoir was revealed. The results showed that there were multi pore types developed in the reservoir and the features were in bi oifference.The micro he erogenety of he pore vasstrong on the connecivityshape,pore diameter and distribution features. The diferences of the reservoir capacity and seepage fovw capacity were controled by the heterogeneity of the reservoir pore- microcrack.The fractal dimension value would be the quantiaive evaluation standard of the pore heterogeneity degree The study on he nanopore and heterogeneity of the shale reservir could provide a new ldeaof the resevir evaluLation and the micro heterogeneou features coud be appied to characterize the reservoir property.