Abstract：The TH12402 well area of the Tahe oilfield that is located in silurian overlying area is characterized by typical paleokarst fractured-cave reservoirs. It is one of the main production and construction sites of the Ordovician in the northwest of Tahe oilfield. Based on 3D seismic data,well logging data and drilling data and pickup technique of seismic attribute,the karst development conditions and reservoir development characteristics of the Lower Ordovician in this area were studied,and the dominant factors and development patterns of karst caves were illustrated. The result shows that the TH12402 well area is located in the south wing of a secondary nose-like structure oriented in the NW direction. This area records the karstification during the third phase of the Middle Caledonian,where the karst landform is mainly composed of low-relief dissolved hills and depressions,the surface water system extends from north to south without abundant branch water system. The karst reservoir space is composed of large maze karst caves and separated single caves that are unfilled,which are mainly located at 40~100m under the unconformity. Strike faults approximately oriented in WE direction,secondary nose-like structure and pinch-out lines of the Upper Ordovician together catrolled the development of paleokarst caves. A karst cave pattern is established considering the influence of strike faults on water concentration in areas within relatively flat karst landforms. These results provide a theoretical basis for paleokarst reservoir prediction and well location deployment in other well regions with similar conditions.
Jiang Ying-Bing,Li Xing-Juan. Development model of paleokarst caves in the Middle-Lower Ordovician of TH12402 well area in Tahe oilfield,Tarim Basin[J]. JOPC, 2021, 23(4): 824-836.
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