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| Numerical simulation for influence factor of pulsed neutron-neutron logging |
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ZHANG Feng1,2,WANG Xin-guang1,2
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(1.College of Geo-Resources and Information in China University of Petroleum，Qingdao 266555, China ;2. CNPC Key Laboratory of Well Logging in China University of Petroleum, Qingdao 266555, Chirm)
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| Abstract: |
| The calculation models under the condition of different cased well situation were established by Monte Carlo method, and the relevant thermal neutron time spectrum was simulated. The formation macroscopic cross section was also calculated. The results show that the formation macroscopic cross section increases with porosity and water saturation increasing, and the thermal capture capability is powerful under the condition of small spacing, high salinity and shale content, large cased size, centraiized tool and high capture lithology formation. The thickness of the casing and the cement do not affect formation macroscopic absorption cross section, but the bigger the casing thickness and the smaller the cement thickness, the lower the total count of the thermal neutron. It must be corrected for different influential factor when the formation water saturation is determined by pulsed neutron logging data. |
| Key words: pulsed neutron-neutron logging water saturation formation macroscopic cross section Monte Carlo simulation |
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