A Quantitative Study of Fault Zone Sealing

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A Quantitative Study of Fault Zone Sealing

A fault is not simply a plane, but a zone consisting of a series of broken planes or lower faults. The greater the scale of faults, the wider and more complex the fault zone is. Fault-sealing properties are influenced by the fault zone itself, whose fault displacement, depth, net-to-gross-ratio of mudstone, fault plane angle, and fault mechanical properties play important controlling roles. The sealing of hydrocarbon by the fault zone depends on whether the fault zone can form a continuous sealing zone and if the pore throats connecting those fault zones are small enough. The concept of fault zone-sealing potential is proposed here, and a quantitative formula is established by using a great amount of practical statistical data as well as the fuzzy comprehensive evaluation method, which is a comprehensive characterization parameter to judge whether or not fault zones could seal oil hydrocarbon. The greater the value of the fault zone-sealing potential, the better sealed the fault is. For example, with increasing depth, the sealing degree of the Xin 68 Fault in the Dongxin 1 oilfield changes greatly, reflecting the complexity of fault-sealing properties.

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作 者: LI Yang ZHAO Mifu  
作者单位:LI Yang(Department of Exploration and Development, SINOPEC, Beijing 100029, China)水利论文Gf#k"JP
ZHAO Mifu(Dongxin Production Factory, Shengli Oilfield Branch Company, SINOPEC, Dongying 207068, China) 
刊 名:地质学报(英文版)  SCI
英文刊名:ACTA GEOLOGICA SINICA 
年,卷(期):2010 84(1) 
分类号:P5 
关键词:fault   fault-sealing properties   fault zone-sealing potential   Xin 68 Fault  
机标关键词:Fault Zonefault zonesmechanical propertiesfault displacementevaluation methodstatistical datacharacterizationquantitativedepthconnectingcomplexitypracticalchangesdegreebettersmallfuzzyformoil 
基金项目:These research results are part of the project Study on Technology to Increase the Recovery Ratio in Oilfields with Complex Fault Block,Science and Technology Promotion Project in the Tenth Five-Year Plan of SINOPECT 
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