Application of FMI data in fracture and tectonic stress field studies in Kal region,middle Tarim Basin
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摘要: 塔中卡1工区中、下奥陶统鹰山组储层主要以裂缝型和裂缝-孔隙型为主,储层发育和分布与裂缝关系密切。利用10口已钻井FMI资料进行裂缝识别、成因分类和走向统计分析,认为该工区高阻缝(构造充填缝)最发育,通常被方解石或泥质充填,高导缝(构造开启缝)和钻井诱导缝次发育。钻井诱导缝和井眼崩落受现今应力场控制,构造成因的高导缝和高阻缝的形成则受古构造应力场控制。卡1工区现今构造最大主应力为NE和NEE2组优势方向,中、晚奥陶世古构造应力场最大主应力方向主要有NNE,NEE2组,其中NNE走向裂缝的形成早于NEE走向的裂缝。Abstract: The reservoirs of the Lower-Middle Ordovician Yingshan Formation in Ka1 region of themiddle Tarim Basin are mainly fissure and fissure-pore types.Reservoir generation and distribution areclosely related to fissures.Fissure identification,origin classification and orientation analyses were car-ried out with FMI data from 10 drilled wells.High-resistant fractures account for the first place in theregion,usually filled with calcite and mud.High-conductive and drilling-induced fractures account forthe second place.Drilling-induced fractures and borehole breakouts are controlled by present stressfield,while high-conductive and high-resistant fractures caused by tectonic genesis are closely related topalaeo-stress field.The present stress field in Ka1 region is mainly NE and NEE oriented.The palaeo-stress field during the Middle and Late Ordovician was mainly NNE and NEE oriented,and the NNEoriented fractures were formed before the NEE oriented ones.
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Key words:
- FMI imaging logging /
- fracture /
- tectonic stress field /
- Ka1 region /
- middle Tarim Basin /
- Tarim Basin
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