Study On Shale Reservoir Characteristics Of The Shanxi Formation Of WY1 Well In Wuxiang,Shanxi Province

Taking Shanxi formation shale of well WY1 in Wuxiang area of Shanxi province as the research object,Taking Shanxi formation shale reservoir in Wuxiang county of Shanxi province as the research object,Based on the field geological observation and sample collection,using X-ray diffraction,scanning electron microscope,high pressure mercury pressure and low temperature nitrogen adsorption and other testing techniques,the paper had systematically studied the material composition,pore fracture structure characteristics of the shale reservoir in Shanxi formation and the main factors affecting the development of pore fissure.The study shows that the shale reservoir of Shanxi formation in the study area is composed of clay minerals and brittle minerals,the average content of clay minerals is 64.75%,which is mainly kaolinite and illite/montmorillonite.And the average content of brittle minerals is33.98%,which is mainly quartz minerals.The organic carbon content?TOC?of shale reservoir is 4.43%on average,the type of kerogen is mainly type?kerogen,and the vitrinite reflectance?Ro?is between 1.55%-2.06%,the organic matter evolution stage is in the high mature stage.The pores of shale are concentrated below 50nm,and the pores in the range of 2⁵0nm are the most developed.The average pore size is about 5.7nm;Pores at 15nm and below are the main contributors to pore volume,and crack pores and“fine bottleneck”pores are relatively developed.The average permeability of the reservoir is 0.0003×10^-3?m² and the average porosity is 2.87%,it belongs to the typical“low porosity and low permeability”reservoir,the pore structure of the reservoir is extremely complex and the heterogeneity is strong.The key factors in the controlling development of shale reservoir are investigated at Shanxi formation,including from the microscopic perspective,such as mineral composition,organic matter abundance.From the macroscopic perspective,it is controlled by the marine-terrestrial sedimentary environment,stable evolution history of the tectonic subsidence,dissolution,transformation of clay minerals,hydrocarbon expulsion of organic matter and other diagenesis.