Petroleum : Field-wise Crude Oil Reserves
          (’000 tonnes)
Year
Gujarat Fields
Assam Fields
Onshore Total
Offshore Total
All Fields
1970–71
56380
71460
127840
 
127840
1971–72
51080
78700
113780
 
113780
1972–73
78280
72900
125180
 
125180
1973–74
49450
77870
127320
 
127320
1974–75
45720
84410
130130
13770
143900
1975–76
45790
81990
127780
147680
275460
1976–77
45780
82280
127900
177880
303180
1977–78
47490
78500
125990
221040
347030
1978–79
45340
82810
128150
227890
354440
1979–80
78730
82650
135380
230950
366330
1980–81
51480
89000
140480
328290
468770
1981–82
53180
91780
144700
325180
469880
1982–83
90580
97030
187610
338700
786310
1983–84
88000
99010
187010
323810
510820
1984–85
86610
101800
188410
311100
499510
1985–86
98640
113830
212470
345540
558010
1986–87
132050
119030
251080
330350
581430
1987–88
143020
124380
267400
371040
371040
1988–89
155120
140240
295360
430860
727820
1989–90
161690
144970
306660
432140
738800
1990-91
158260
157820
314480
491670
806150
1991-92
156550
160820
317370
483680
801050
1992-93
155090
158160
313250
465810
779060
1993-94
153400
156060
309460
455170
764630
1994-95
153200
147870
301070
431080
732150
1995-96
178080
154330
306410
422280
728690
1996-97
150910
189630
340540
405170
745710
1997-98
148020
160390
308410
404490
712900
1998-99
 
 
306000
378000
658000
1999-00
 
 
310000
335000
645000
* From 1978-79, reserves in Assam fields includes Nagaland, Tamil Nadu, Andhra Pradesh & Arunachal Pradesh.
Source : CMIE, April 2001