Characteristics and evolution mode of the Ordovician paleodrainage system architecture in northwestern Tahe oilfield,Tarim Basin,China
WANG Yan1,2, WANG Nuoyu3,4, YANG Debin1,2, ZHANG Heng3,4, ZHANG Juan1,2, ZHANG Changjian1,2, ZHANG Xiao1,2
1 Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-Vuggy Reservoirs,CNPC,Urümqi 830011,China; 2 SINOPEC Northwest Company of China Petroleum and Chemical Corporation,Urümqi 830011,China; 3 Hubei Provincial Key Laboratory of Oil and Gas Exploration and Development Theory and Technology (China University of Geosciences(Wuhan)),Wuhan 430074,China; 4 Key Laboratory of Tectonics and Petroleum Resources,China University of Geosciences(Wuhan), Ministry of Education,Wuhan 430074,China
Abstract：The deep surface water system structure developed in the Middle and Lower Ordovician in the northwest of Tahe Oilfield has a significant impact on the development of karst fractures and caves on both sides of the water system. Therefore,it is crucial to quantitatively describe the water system structure and conduct researches on its evolution mode. Based on three-dimensional seismic data,seismic attribute extraction technology was utilized to identify paleokarst platform and paleokarst surface water systems. In addition,the planar and vertical morphologic structure parameters of the surface drainage system were quantitatively characterized. Consequently,the formation and evolution patterns of paleokarst surface water systems was explored,and the relationship between surface water system evolution and paleokarst cave-fissure development was analyzed as well. The research results indicate that: (1)Three paleokarst paltform and a deep meandering gorge type surface watershed structure are developed from east to west in the northwest of Tahe Oilfield. The main water system in this basin flows in a north-south direction,while the branch water system flows in an east-west direction,exhibiting an asymmetric distribution pattern. (2)The curvature rate of a single river bend in the water system is greater than 1.5,exceeding the critical value for defining the curvature rate of a meander bend,and featuring typical meander characteristics. The curvature rate of the east-west meander belt is 2.42,and the curvature rate of the north-south meander belt is 1.78. (3)The east-west water system mainly has a single V shape,while the north-south water system has a composite V shape. The incision depth of the water system in the three paleokarst platform gradually deepens from east to west,and the average width to depth ratios of the water system are 4.06,3.52,and 3.03,respectively. (4)The paleokarst surface water system in the study area experienced two stages: free meandering and entrenched meandering, reflecting the lateral and vertical erosion processes of the water system, respectively. Among them,vertical erosion of the water system occurs gradually,adapting to the gradual uplift of the three paleokarst paltform. (5)Deep meandering is the lowest drainage reference level in a region,controlling the development of large karst underground rivers on both sides of the river. Each karst platform has an independent water circulation structure,and the gradual uplift of the karst platform promotes the differential evolution of the water system,thereby controlling the differences in the scale and type of karst underground rivers. The understanding of the paleokarst water system structure and its evolution in the research area provides important reference basis for the study of the development characteristics and distribution patterns of paleokarst fracture cave storage space.
WANG Yan,WANG Nuoyu,YANG Debin et al. Characteristics and evolution mode of the Ordovician paleodrainage system architecture in northwestern Tahe oilfield,Tarim Basin,China[J]. JOPC, 2024, 26(6): 1467-1482.
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