中子孔隙度

欠平衡钻井条件下钻井液的密度对中子孔隙度测井的影响

Effect of Drilling Fluid Density on Neutron Porosity in Underbalanced Drilling

补偿中子孔隙度的计算和校正

Calculation and Correction of Compensated Neutron Porosity

在研究中，提取密度中子孔隙度差异指标和FMI测井裂缝参数指标，并采用R型聚类分析，对常规测井裂缝指标和FMI测井裂缝参数指标进行优化，形成了优化的裂缝指标集；

R-cluster analysis is applied to select fracture indexes of conventional well log and FMI log and to optimize the collection of fracture indexes .

声速测井确定的孔隙度氘-氘和氘-氚随钻中子孔隙度测井探测特性对比

Comparison of D-T and D-D accelerator investigation characteristics in pulsed neutron porosity logging while drilling

当中子孔隙度与密度孔隙度曲线重叠时，会有密度孔隙度远高于中子孔隙度的特征；

When superposing neutron porosity log with density porosity log , density porosity is far higher than neutron porosity .

理论上认为，储层含气使声波时差孔隙度和密度孔隙度增大，使中子孔隙度减少。

It is theoretically considered that reservoir gas-bearing makes interval transit time porosity and density porosity increase and neutron porosity decrease .

天然气对中子孔隙度测量的影响不能由含氢指数的差别来解释。

That part of the effect of gas on the neutron porosity measurement that is not explained by differences in hydrogen index .

用声波时差计算总孔隙度中t与计算出的中子孔隙度中。对比，其差值就是CO：的影响所致。

The difference of the porosity-calculated from sonic log and from neutron log is related to the effect of CO2 in gas-bearing beds .

当地层含气后，声波时差数值增大，补偿密度、中子孔隙度降低，使孔隙度曲线重叠存在幅度差，分析为气层。

When reservoir has gas , acoustic time increase , density and neutron porosity depress , to porosity curve separate , concluding gas horizon .

综合运用声波、自然伽马、中子孔隙度、井径、密度和双侧向测井等测井曲线，对2口井的储层进行了划分；

Reservoir classification of 2 wells is made by comprehensively using sonic , natural gamma ray , neutron porosity , caliper density logging curves and dual laterolog curves .

通过对双层介质扩散方程解析解的分析以及蒙特卡罗数值模拟，研究了低密度钻井液条件下中子孔隙度测井响应的变化规律。

The low density drilling fluid has borehole excavation effect on compensated neutron porosity logging , and by this way apparent porosity is lower than the true value .

理论认为当储层中存在着天然气时，会导致纵波时差增大，横波时差不变，密度测井值减小，中子孔隙度减小。

Theoretically , when gas exists in reservoir , longitudinal wave offset time will increase and transverse wave offset time will not change and density will decrease and neutron will decrease , too .

但是，对埋藏较深的气层而言，由于其孔隙度曲线特征并不明显，故用常规方法识别十分困难，特别是当密度孔隙低于中子孔隙度时，上述两方法识别气层均失败。

But it will fail to recognize the gas bearing bed buried deeper by the two methods as its porosity log feature is not obvious , especially when density porosity is lower than neutron porosity .

并依据气层在三孔隙度曲线上存在的特殊的响应特征，探讨空间模量差比法、双中子孔隙度差值法等直观识别气层方法与常规方法的验证关系。

Results of methods to identify gas beds intentionally such as space modulus difference ratio method , double neutron porosity difference method and these conventional method are discussed based upon the special response characteristics of the 3-porosity curves of gas beds .

利用数字测井参数确定软弱夹层，主要使用中子孔隙度、切变量、体密度三个变量建立判别函数，并求出函数值。

The parameter that geology was measured with numbers determine the weak of the stratum is mainly making good use of the density of neutron , changing quantum , the volume and use them to distinguish from the weak of the stratum .

孔隙测井特征参数（包括声波时差比K4、密度比K5、中子相对孔隙度K6）；

Porosity parameters , ratio of acoustic wave time difference K4 , ratio of density K5 , neutron relative porosity K6 ;

中子测井孔隙度受多方面环境因素的影响。

Experiential Formulas for Neutron Porosity and Lithology Corrections and Their Application .

依据美国阿特拉斯公司的2435补偿中子测井孔隙度的校正图版，介绍如何利用图版数据绘出关系曲线，再对曲线进行拟合，从而建立对视孔隙度进行矿化度、井径、岩性校正的经验公式并进行验证；

Based on Atlas 2435 CN Response chart , the empirical formulas have been set up of correcting apparent porosity for salinity , caliper and lithology through drawing and fitting their relation curves .

在大斜度井、水平井中如果完井没有测到物性资料可以用套管补偿中子计算地层孔隙度。

In highly-deviated wells and horizontal wells , if physical property data fail to be measured in completion , casing compensated neutron data can be used to calculate the formation porosity .

若地层的真孔隙度和含气饱和度已知，根据中子测井视孔隙度、密度测井视孔隙度之间的差值的高低可区分气体的组份是二氧化碳气还是烃类气。

If the true porosity and gas-bearing saturation are given , carbon dioxide or hydrocarbon in the gas components might be determined form differences between neutron log apparent porosity and density log apparent porosity .

文章提出一种新的油气校正方法，即用叠代法逐步校正油气对中子与密度曲线的影响，计算出油气密度与油气的中子孔隙度，并以此参数构成交会图。

So , a new oil-gas corrective method , progressively correcting the influence of oil-gas on neutron density log by superposition and calculating out oil-gas density and neutron porosity to form crossplot .

因此提出了补偿中子与补偿密度交会法进行砂泥岩剖面岩性分析、补偿中子与有效孔隙度差值法进行泥质含量求取等方法。

This paper presents some methods for computing the shale content and lithological analysis of shale-sand strata , which include the CNL / effective porosity differential method and the CNL / CDL crossplot .

为了解决这个问题，作者依据中子测井的挖掘效应原理，提出一种识别气、水层的新方法：首先，采用声波和中子孔隙度之间的差值合成一种新的曲线&声波中子合成曲线；

In order to solve this problem , this paper gives a new way to identify reserviors according to the theory of excavation effect : first , to synthesize a new log ( ACNL ) by acoustic and neutron porosity ;