3D Outcrop Geological Modeling Of Jiantianba Area Based On UAV Oblique Photography Data

Lichuan city,Enshi prefecture,Hubei province,is located between the Exi rift trough and the eastern Sichuan carbonate platform.In Changxing period,a set of large-scale platform-bordered bioherm deposits developed in this area.Previous studies on sequence division,sedimentary characteristics,internal composition of quasi-sequence groups,reef-forming model and comprehensive reservoir prediction in this area have achieved periodic results,but the studies on the morphology,plane distribution,scale direction and superposition relationship of the configurational microfacies unit of the reef-beach facies are not detailed enough.Considering existing limitation in obtaining outcrop geological knowledge base,cutting-edge UAV technology was introduced to geological work,use its agility,globality perspective and a high degree of quantification to acquisite and processing data and serve the geology interpretation in Typical outcrop area of organic reef in Jiantianba area in Lichuan city,Hubei province.Based on the combination of traditional artificial reconnaissance and UAV(unmanned aerial vehicle)technology,the geological knowledge base of outcrop area is established.Take this as the data support,a 3D geological model of typical outcrop in the field was established.From the perspective of reservoir architecture,conduct a research of organic reef of Changxing formation in Jiantianba area in Lichuan city Hubei province.Researches show that: The organic reef of Jiantianba area in Lichuan city,Hubei province is a regressive platform marginal reef.The formation skeleton model and lithology primary model which were established on the basis concluding POS(positioning and orientation system)data,image data,and the established reservoir geological knowledge base,etc.has a good reflection of the geological scale and topographic relief within a small range of the study area,but the lithology distribution law is relatively disorderly,which is far from the actual distribution pattern of reef and shoal facies.Taking multi-point geostatistics as the theoretical guidance,taking training image as a geological constraint,the quadratic model is established which better reflects the sedimentary pattern of the study area,which is more consistent with the existing geological understanding.The results of the later uncertainty analysis(parameter analysis and model comparison)show that the quadratic model is more reliable.Take the precise reservoir geologic modeling of Jiantianba area as a typical model,present constructive suggestions in 3D outcrop geological modeling based on UAV oblique photography data and the reservoir architecture of reef flat facies.