CMG中K值的讨论 [复制链接]

1、K值的含义
   组分的K值反映了该组分在各个相中的含量，确切的说，是该组分在各相中的溶解度，因为是在各相中的溶解度不同，使得该组分在各相中的含量不同，定义式为（以C02为例）：K(gas/liq) = (gas mole fraction)/(oil mole fraction) =(moles of the CO2 in the gas phase/total moles in the gas phase)/(moles of the CO2 in the oil phase/total moles in the oil phase) ，再假如油相中含有CO2 bitumen(沥青) Naphtha（石脑油）三种组分，请问溶于水相中的CO2还属于油相吗，或者说油相中各组分的总摩尔数是恒定不变的吗？如果各个相中各组分的总摩尔数不随着某个组分在其他相的溶解而变化，即是恒定不变的，则其K值的含义比较好理解，就是上面说的K反映了组分在各个相中的含量。

2、K值的设定
K值表的设定过程中，会弹出K Value table parameters对话框，其中第8和第9项，让选择关键组分和关键相，这个不太理解，因为在定义K值的时候，第一步已经选择是设定哪个组分的K值，所以不明白为何要选择第8相，在定义组分名称的时候，已经指定各组分的基准相是什么，比如CO2的reference phase 为oil phase，为什么要选择第9相？同时还有一个选项不明白 key phase composition dependency,选择 independent 和选择dependent的区别是什么？

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我最近在用CMG想 模拟下空气驱的情况，找了个CO2驱的例子，里边有关于K值的关键字，如下：
*GASLIQKV

*KVTABLIM  20 1420  75 575   ** Low/high p & T

*KVTABLE 3  ** Gas/liquid K value y/x table for CO2

52.013   5.5640   3.3521   2.5673   2.1653   1.9209   1.7567   1.6387
62.017   6.4735   3.8285   2.8900   2.4093   2.1171   1.9207   1.17796
72.916   7.4642   4.3475   3.2416   2.6751   2.3308   2.0994   1.9331
84.708   8.5363   4.9090   3.6220   2.9627   2.5620   2.2927   2.0992
97.394   9.6895   5.5131   4.0312   3.2721   2.8108   2.5007   2.2779
110.97   10.924   6.1598   4.4693   3.6034   3.0770   2.7233   2.4692
125.45   12.240   6.8490   4.9361   3.9564   3.3608   2.9606   2.6730
140.82   13.673   7.5808   5.4319   4.3312   3.6622   3.2125   2.8895
157.08   15.115   8.3552   5.9564   4.7278   3.9810   3.4791   3.1185
174.23   16.675   9.1721   6.5098   5.1463   4.3174   3.7603   3.3601
192.28   18.316   10.032   7.0921   5.5865   4.6713   4.0562   3.6143

*KVTABLE 4  ** Gas/liquid K value y/x table for naphtha

.15356   .02622   .01433   .009861  .007516  .006072  .005094  .004387
.21669   .03820   .02095   .01443   .01100   .008895  .007464  .006429
.31540   .05622   .03087   .02127   .01623   .01312   .01101   .009482
.48820   .08443   .04621   .03181   .02425   .01960   .01644   .01416
.86083   .13123   .07103   .04869   .03704   .02989   .02505   .02156
1.50     .21629   .11368   .07711   .05834   .04692   .03923   .03371
2.25     .39740   .19380   .12816   .09573   .07640   .06356   .05442
3.00     .94105   .36668   .22770   .16512   .12952   .10655   .09050
3.65     1.45     .84335   .43928   .29698   .22430   .18022   .15062
4.35     2.00     1.3000   .88886   .51497   .36250   .27969   .22767
5.00     2.50     1.8500   1.4402   .68479   .49919   .33420   .26609


*LIQLIQKV

*KVTABLIM  20 1420  75 575   ** High/low p & T

*KVTABLE 1  ** Liquid/liquid K value x/w table for water component in oil phase

.008556  .008401  .008245  .008089  .007934  .007778  .007622  .007467
.003401  .003339  .003278  .003216  .003154  .003092  .00303   .002968
.01512   .01485   .01457   .01430   .01402   .01375   .01347   .01320
.04372   .04293   .04213   .04134   .04054   .03975   .03895   .03816
.08920   .08758   .08595   .08433   .08271   .08109   .07946   .07784
.15155   .14880   .14604   .14328   .14053   .13777   .13501   .13225
.23078   .22659   .22239   .21819   .21399   .20979   .20559   .20140
.32689   .32094   .31500   .30905   .30311   .29716   .29121   .28527
.43988   .43187   .42387   .41587   .40787   .39987   .39187   .38386
.56974   .55937   .54901   .53865   .52828   .51792   .50755   .49719
.71648   .70344   .69041   .67738   .66434   .65131   .63828   .62525

*KVTABLE 3  ** Liquid/liquid K value w/x table for CO2 in water phase

.01756   .01756   .01756   .01756   .01756   .01756   .01756   .0175
.02162   .02162   .02162   .02162   .02162   .02162   .02162   .0216
.02323   .02323   .02323   .02323   .02323   .02323   .02323   .0232
.02365   .02365   .02365   .02365   .02365   .02365   .02365   .0237
.02417   .02417   .02417   .02417   .02417   .02417   .02417   .0242
.02614   .02614   .02614   .02614   .02614   .02614   .02614   .0261
.02910   .02910   .02910   .02910   .02910   .02910   .02910   .0291
.03420   .03420   .03420   .03420   .03420   .03420   .03420   .0342
.04248   .04248   .04248   .04248   .04248   .04248   .04248   .0425
.05555   .05555   .05555   .05555   .05555   .05555   .05555   .0556
.06758   .06758   .06758   .06758   .06758   .06758   .06758   .0676

*KVTABLE 4  ** Liquid/liquid K value x/w table for naphtha in water phase

1.208E-6 1.208e-6 1.208e-6 1.208e-6 1.208e-6 1.208e-6 1.208e-6 1.21e-6
3.265E-6 3.265e-6 3.265e-6 3.265e-6 3.265e-6 3.265e-6 3.265e-6 3.27e-6
6.902E-6 6.902e-6 6.902e-6 6.902e-6 6.902e-6 6.902e-6 6.902e-6 6.90e-6
1.319E-5 1.319e-5 1.319e-5 1.319e-5 1.319e-5 1.319e-5 1.319e-5 1.32e-5
2.425E-5 2.425e-5 2.425e-5 2.425e-5 2.425e-5 2.425e-5 2.425e-5 2.43e-5
4.448E-5 4.448e-5 4.448e-5 4.448e-5 4.448e-5 4.448e-5 4.448e-5 4.45e-5
8.329E-5 8.329e-5 8.329e-5 8.329e-5 8.329e-5 8.329e-5 8.329e-5 8.33e-5
1.620E-4 1.620e-4 1.620e-4 1.620e-4 1.620e-4 1.620e-4 1.620e-4 1.62e-4
3.314E-4 3.314e-4 3.314e-4 3.314e-4 3.314e-4 3.314e-4 3.314e-4 3.31e-4
7.198E-4 7.198e-4 7.198e-4 7.198e-4 7.198e-4 7.198e-4 7.198e-4 7.20e-4
.00167   .00167   .00167   .00167   .00167   .00167   .00167   .00167

** Change Naphtha and CO2 surface phase to water, their injection phase
SURFLASH W O W W

手册里是这样解释的：
*GASLIQKV | *LIQLIQKV

*KVTABLIM  plow  phigh  Tlow  Thigh

*KVTABLE  comp_name

                K_value_table

*KVKEYCOMP  key_comp  key_phase  xlow  xhigh  (slope int)

*KVTABLE  comp_name

                { *KEYCOMP

                K_value_table }

K_value_table

K(Tlow,plow)) . . . K(Tlow,phigh)

.  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .

K(Thigh,plow) . . . K(Thigh,phigh)

The maximum allowed number of table entries assigned to a component, or a *KEYCOMP set, is 1500. The maximum allowed number of rows (temperature values) is 50; the maximum allowed number of columns (pressure values) is 30. There must be at least two columns and two rows.

All gas-liquid tables must have the same number of columns and the same number of rows. All liquid-liquid tables must have the same number of columns and the same number of rows.

。。实在看不懂了，楼主怎么看？