基于交会图决策树的缝洞体类型常规测井识别方法——以塔河油田奥陶系为例

doi:10.11743/ogg20170417

Abstract

Abstract: The Ordovician in Tahe oilfield are rich in oil and gas resources.It develops caves,vugs and fractures filled with different materials due to karstification.Different reservoir spaces and fillers form a variety of fracture-vug complex types.So the conventional logging responses are complex and it is very difficult to identify the fracture-vug complex types.Based on outcrops,cores,borehole image logging data,six fracture-vug complex types are determined.They are unfilled cave type,sand and shale-filled cave type,breccias-filled cave type,calcite-filled cave type,fractured-vuggy type and fractured type,respectively.In combination with the differences of lithologies and physical properties between different fracture-vug complex types,their characteristics of dual lateral,natural gamma,sonic,neutron and density logging and distribution patterns are analyzed.Nine crossplots sensitive to fracture-vug complexes are selected from the pairwise logging response cross plots and are integrated with decision tree to formulate a step by step fracture-vug complex type identification method.This method is applied to real well data processing and interpretation in Tahe oilfield.Compared with of cores and geologic logging,the coincidence rates of the identification results with core and geologic logging data are greater than 85%.The method can reduce the confusion among the conventional logging responses of different fracture-vug complex types,thus increase the accuracy of identification results.

Key words: crossplot, decision tree, conventional logging, fractur-vug complex, carbonate rock, Ordovician, Tarim Basin

CLC Number:

TE122.2

Wang Xiaochang, Zhang Jun, Li Jun, Hu Song, Kong Qiangfu. Conventional logging identification of fracture-vug complex types data based on crossplots-decision tree:A case study from the Ordovician in Tahe oilfield,Tarim Basin[J]. Oil & Gas Geology, 2017, 38(4): 805-812.

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Conventional logging identification of fracture-vug complex types data based on crossplots-decision tree:A case study from the Ordovician in Tahe oilfield,Tarim Basin

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