基于无人机倾斜摄影的辫状河三角洲露头构型表征:以克孜努尔沟侏罗系阿合组为例OA

In order to reveal the formation process and depositional characteristics of the braided river delta of the Ahe Formation in the Kuqa Depression of the Tarim Basin,traditional fieldwork methods were combined with unmanned aerial vehicle(UAV)oblique photography technology to systematically observe the profile of the Ahe Formation in the Kezinuer Gully.In this study,the reservoir sand body was quantitatively characterized through cyclical constraints and hierarchical anatomical analyses with the guidance of the reservoir conformation theory.The results showed that:(1)6 typical sedimentary structures,13 lithofacies,and 3 typical fourth-level conformational units,i.e.,distributary channel,distributary bar,and abandoned channel,were identified.(2)Vertically,the fourth-order conformational units showed superimposition patterns,such as distributary channel over distributary channel,distributary channel over distributary bar,and distributary channel over abandoned channel.Laterally,the structure demonstrated the cut and stacking features,including distributary channel paired with the distributary channel,the cut and stack of the distributary bar with the distributary channel,and the cut and stacking of the distributary bar with the distributary bar.(3)The thickness of the distributary channel ranged from 1.18 to 8.38 m,with an average of 4.27 m.The width of the distributary channel spaned from 24.8 to 74.36 m,with an average of 48.92 m.The correlation coefficient between the width of the distributary channel and the thickness of the distributary bar was 0.74.The thickness of the distributary bar ranged from 1.02 to 6.84 m,with an average of 3.19 m.The correlation coefficient between the thickness of the distributary channel and the distributary bar was 0.71.Field measurements and quantitative analyses of each constitutive unit allowed the establishment of quantitative models.These models were constrained and corrected through computational adjustments,facilitating an improved quantitative characterization of the Ahe Formation.The research results provided a theoretical basis for Jurassic hydrocarbon exploration in the Tarim Basin.