本文關(guān)鍵詞： 可控中子源 雙源距 密度 含氫指數(shù) 蒙特卡羅模擬　出處：《中國石油大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年04期 　論文類型：期刊論文

【摘要】：針對中子伽馬密度測井中利用單探測器信息進(jìn)行含氫指數(shù)校正計(jì)算密度結(jié)果的不穩(wěn)定問題,開展雙源距含氫指數(shù)校正方法研究;采用蒙特卡羅方法模擬熱中子、伽馬分布與密度和含氫指數(shù)的響應(yīng)規(guī)律,建立熱中子、俘獲伽馬以及氫俘獲伽馬計(jì)數(shù)比進(jìn)行含氫指數(shù)校正的密度計(jì)算模型,對比不同粒子含氫指數(shù)校正效果以及井徑、礦化度的影響。模擬結(jié)果表明:含氫指數(shù)校正后密度準(zhǔn)確度明顯改善;其中,熱中子含氫指數(shù)校正后的密度精度和準(zhǔn)確度最高,氫俘獲校正密度準(zhǔn)確度略高于俘獲伽馬,但其密度精度遠(yuǎn)小于熱中子和俘獲伽馬。雙源距含氫指數(shù)校正密度誤差隨著井徑和地層水礦化度的增大而增大;其中,熱中子校正受井徑和礦化度影響最小,氫俘獲和總俘獲伽馬校正方法受影響較大。研究結(jié)果為隨鉆測井準(zhǔn)確計(jì)算中子伽馬密度提供了校正方法。
[Abstract]:In order to solve the unstable problem of using single detector information to correct the density of hydrogen in neutron gamma density logging, the double source distance hydrogen index correction method is studied, and the Monte Carlo method is used to simulate thermal neutron. Based on the response law of gamma distribution to density and hydrogen content index, a density calculation model of thermal neutron, capture gamma and hydrogen capture gamma counting ratio for correction of hydrogen content index is established, and the correction effect of hydrogen content index and well diameter of different particles are compared. The simulation results show that the density accuracy is obviously improved after the correction of hydrogen content index, in which the density accuracy and accuracy of thermal neutron hydrogen index correction are the highest, and the accuracy of hydrogen capture correction density is slightly higher than that of capture gamma ray. But its density accuracy is much less than thermal neutron and capture gamma. The correction density error of double source distance hydrogen content index increases with the increase of well diameter and formation water salinity, in which thermal neutron correction is least affected by well diameter and salinity. Hydrogen capture and total capture gamma correction methods are greatly affected, and the results provide a correction method for accurate calculation of neutron gamma density by logging while drilling.
【作者單位】： 中國石油大學(xué)地球科學(xué)與技術(shù)學(xué)院;海洋國家實(shí)驗(yàn)室海洋礦產(chǎn)資源評(píng)價(jià)與探測技術(shù)功能實(shí)驗(yàn)室;新疆油田公司勘探公司;南京航空航天大學(xué)材料科學(xué)與技術(shù)學(xué)院;河南省科學(xué)院同位素研究所有限責(zé)任公司;喀左縣蒙古族高級(jí)中學(xué)古塔分校生物科組;
【基金】：國家自然科學(xué)基金項(xiàng)目(41374125,41574119) 國家重大油氣專項(xiàng)(2017ZX05019005-004) 中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)(14CX05011A,15CX06008A)
【分類號(hào)】：P631.817

【相似文獻(xiàn)】

相關(guān)期刊論文 前3條

1 劉圣康;王述新;蔣奇;趙良孝;蔣延安;趙馬龍;;用熱中子透射確定巖樣含氫指數(shù)的方法[J];測井技術(shù);1981年06期

2 趙經(jīng)武,劉圣康,潘少明;巖石熱中子宏觀吸收截面和含氫指數(shù)的測量[J];測井技術(shù);1988年04期

3 宋明會(huì);曾永文;姚長明;黃莉;敖蒼穹;孔祥雨;;天然氣核磁共振特征分析及探討[J];錄井工程;2008年03期

，

本文編號(hào)：1537976