| The middle Jurassic in land in the north of Junggar basin the J2x1from the M wellblock interval is an important oil and gas exploration target,small layers in the study area,this paper combined with datas of geologic aspects,logging data and so on.By the J2x1 from the M wellblock is a fine little layer division between interlayer and sand body distribution research of sedimentary microfacies and reservoir characteristics,the existing classification and distribution of reservoir system to investigate the relationship between reservoir sedimentary micro facies reservoir.Combined with the sedimentary cycle characteristics and logging marks in the study area,J2x1of xishanyao formation in M9 well area is divided into 2 small layers:J2x11and J2x12,of which J2x11is divided into 3 single sand layers:J2x11-1,J2x11-2and J2x11-3.The J2x12is divided into two single sand layers:the sand body thickness of J2x12-1and J2x12-2is 30?45m,with an average thickness of about 40m,and the thickness of single sand layer is 3?10m.The calcareous septum developed between each single sand body,with a thickness of 0.5?11m and an average thickness of 4.5m,mainly in J2x11.On the basis of fine small-bed division and sand-body intercalation study,four types of sedimentary microfacies were divided into four types:underwater channel,branched channel mouth bar,distal bar and between tributary bar.According to the results of thin section identification has the casting thin sections,core data and logging interpretation result,such as the study area is given priority to with fine-grained lithic sandstone in light grey,in low permeability reservoirs,the separation medium,rounded,combined with reservoir classification show bout some preliminary development in the main reservoir in the study area as the main research area of the Midwest J2x11-2,according to the different microfacies types of porosity,permeability,branch river mouth dam reservoir property is best. |
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