Hai Tao, Yao Junbo, Li Bojie, Ding Lei, Zhang Shiliang, Liu Hongguang. Characteristics and controlling factors of the Middle and Lower Ordovieian carbonates in the 12th district of the Tahe Oil Field[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2015, 37(S1): 16-19. doi: 10.11781/sysydz2015S1016
Citation: Hai Tao, Yao Junbo, Li Bojie, Ding Lei, Zhang Shiliang, Liu Hongguang. Characteristics and controlling factors of the Middle and Lower Ordovieian carbonates in the 12th district of the Tahe Oil Field[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2015, 37(S1): 16-19. doi: 10.11781/sysydz2015S1016

Characteristics and controlling factors of the Middle and Lower Ordovieian carbonates in the 12th district of the Tahe Oil Field

doi: 10.11781/sysydz2015S1016
  • Received Date: 2015-08-01
  • Rev Recd Date: 2015-10-27
  • Publish Date: 2015-12-31
  • The Middle-Lower Ordovician reservoir is considered the main developing interval in the 12th district of the Tahe Oil Field. Multi-phase orogeneses and karstifications are the main cause for the highly matured dissolved fissures and caves within the Middle-Lower Ordovician, which may also result in complex reservoir heterogeneity. This paper comprehensively utilizes data of seismic survey, coring, thin section, logging and laboratory test to clarify the fissure-cave reservoir characteristics within the Middle-Lower Ordovician in the 12th district of the Tahe Oil Field, and further discusses its dominating factor. The results indicate that, three reservoir types exist in the study area:cave type, fissure-cave type and fissure type. Primary pores take up only a tiny proportion in the accumulating spaces. Kart caves type occupies the majority, with the secondary fissure-cave type ranking behind. Dissolved fissure may undertake a favorable connecting conduit. Moreover, the reservoir dominating by fissure-fracture system, developing dissimilarly along the fissure-fracture system, may be controlled by multiple developing model along the paleochannel. Those findings may imply that underground-river conduit and monadnock existing in the lateral side of surface river are supreme zones for reservoir developing, while the dissolved fracture surface follows.

     

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