塔河油田碳酸盐岩缝洞型油藏堵水效果地质影响因素

doi:10.11743/ogg20110618

Abstract

Abstract:

The major reservoirs of Tahe oilfield consist of fractured-vuggy carbonates which underwent multiple stages of karstification and hydrocarbon charging.These reservoirs are of strong heterogeneity,complex oil-water contact and poor water shutoff effect.This study indicates that reservoir types and oil-water distribution patterns are the two key geological factors affecting water shutoff.The remaining oil distribution of the carbonate reservoirs of fractured-vuggy type is quite complicated due to the existence of big solution cavities,especially the high-angle fractures.The big solution cavities can make plugging water diffcult,while the high-angle fractures can easily result in complete shutoff,leading to poor shutoff effects.The fracture-vuggy reservoirs show quasi-homogeneity similar to sandstone reservoirs,thus their water shutoff effects are fair.Oil-water relationship pattern of quasi-homogeneous type corresponding to the reservoir types and wells with slowly-increasing or step-wise increasing water cuts have better water shutoff effects.Moreover,the existence of tight sections also can improve the water shutoff effects.

Key words: oil production stabilization through water cut controlling, geological factor, water shutoff effect, fractured-vuggy reservoir, Tahe oilfield

CLC Number:

TE358

Rong Yuanshuai, Gao Yanxia, Li Xinhua. Geological factors influencing water shutoff effects of fractured-vuggy carbonate reservoirs in Tahe oilfield[J]. Oil & Gas Geology, 2011, 32(6): 940-945.

References

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Geological factors influencing water shutoff effects of fractured-vuggy carbonate reservoirs in Tahe oilfield

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