沉积与特提斯地质2025，Vol.45Issue(2)：282-293,12.DOI:10.19826/j.cnki.1009-3850.2025.03001
鄂西北见天坝生物礁露头三维建模与气藏数值模拟:以传统露头数据集和无人机倾斜摄影模型为例
Three-dimensional modeling and gas reservoir numerical simulation of the Jiantianba reef outcrop in northwestern Hubei:A case study using traditional outcrop data set and the UAV oblique photography model
摘要
Abstract
By integrating traditional field investigation,UAV oblique photogrammetry,and 3D geological modeling techniques,a 3D quantitative prototype model was established using the outcrop of the Upper Permian Changxing Formation carbonate platform-margin reef at Jiantianba in northwestern Hubei as a case study.Numerical simulation of gas reservoirs was subsequently conducted.From bottom to top,13 sedimentary microfacies and 5 complete depositional cycles are identified at the outcrop section,exhibiting a shallowing-upward evolution vertically,with lithological evolution from bioclastic limestone(reef base)to framestone,bafflestone,boundstone,and finally micritic bioclastic limestone(reef top).3D modeling demonstrates significant spatial heterogeneity:micritic dolostone occurs as clusters in the reef top and cap,sponge-framestone forms banded layers in the middle-upper reef,algal-bound sponge reef limestone exhibits irregularly connected patches in the middle-lower reef,algal-bound reef limestone appears as sheet-like units in the lower reef,bioclastic micritic limestone is distributed as isolated points at the reef base.Pressure simulations show rapid pressure depletion(with an initial pressure of 41.5 MPa decreasing to 28 MPa after 1 year,and further to 12 MPa after 5 years)and gas saturation decline(with an initial level of 70%dropping to 56%at the reef top and 60%in the upper reef after 1 year,and further decreasing to 14%at the reef top and 38%in the upper reef after 5 years).The reef top,with superior reservoir quality,shows a rapid decline in gas saturation(to 42%),while the upper reef,with poorer properties,exhibits slower saturation reduction(to 22%).This study highlights that:The 3D geological model demonstrates the complexity and heterogeneity of the reef structure,with the dolomite in the upper part of the reef(reef cover)displaying the best reservoir characteristics.The numerical simulation results reflect that reef gas reservoir is characterized by a rapid decline in pressure during the early production stages and a slower decline in the later stages.In summary,the outcrop geological model based on the 3D digital outcrop model can better simulate the numerical seepage and residual gas distribution of reef gas reservoirs.关键词
无人机/数字露头/礁滩相/三维建模/气藏数值模拟/长兴组气藏Key words
UAV/digital outcrop/reef-beach facies/3D modeling/numerical simulation of gas reservoir/Changxing Formation gas reservoir分类
地质学引用本文复制引用
陈星月,印森林,孙敬,高全慧,唐攀,雷章树,段志文..鄂西北见天坝生物礁露头三维建模与气藏数值模拟:以传统露头数据集和无人机倾斜摄影模型为例[J].沉积与特提斯地质,2025,45(2):282-293,12.基金项目
长江大学地质资源与地质工程一流学科开放基金项目(2019KFJJ0818022) （2019KFJJ0818022）
油气藏地质与开发工程国家重点实验室开放基金(PLN2022_19) （PLN2022_19）
