1794-6190 1794-6190 S1794-61902023000200109 10.15446/esrj.v27n2.98795 Nigeria Nigeria Sudan China 00 06 2023 00 06 2023 27 2 109 128

2022 137 105501 1988 2019 97 52-72 2022 31 1 1 385-413 1983 33 4 4 237-93 2012 18-42 2005 75 2 2 166-76 1992 213 1-2 1-2 141-51 2006 1987 39 1983 1983 63-74 1988 329 2015 2018 1977 627-39 1960 485 1988 58 2-4 2-4 105-26 1983 94 222-35 1979 63 12 12 2164-82 1964 55 691-704 2007 24 3 3 129-44 2015 309-19 2015 2 6 6 206-10 2022 145 105910 1988 a 155 181-91 1988 b 22 821-31 1974 182 Geological Research Authority of Sudan (GRAS) 1981 1994 83 4 4 787-98 2009 221 1-4 1-4 99-126 2017 129 338-45 1997 114 131-61 1996 255 79-97 2001 144 3-4 3-4 307-34 1988 96 3 3 263-77 1989 8 2-4 2-4 283-306 2007 202 1-2 1-2 249-68 1966 2009 30 1 1 100-26 1990 74 8 8 1203-11 2023 107 3 3 477-513 2017 86 1191-206 2021 11 1 1 1-22 2021 11 1 1 1-27 1977 a 13 13 13 1-62 1977 b 1978 597-604 1985 22 261-308 2006 582 2008 9 1 1 1-8 2001 32 2 2 179-91 2007 195 1-2 1-2 75-90 2004 2017 64 6 6 1572-96 2015 85 5 5 544-61 1987 Second 553 1968 76 1 1 99-110 2022 29-49 2022 b 81 15 15 382 1987 59 C C 93-116 1977 5 1977 1977 605-25 1997 105-49 2015 1988 72 10 10 1128-42 2000 521 1999 69 5 5 992-1002 2018 1-15 Sudan Ministry of Oil and Gas 2011 2010 94 8 8 1093-132 2022 105409 2010 8 4 4 463-82 1993 9 201-9 1971 290 1991 12 185-200 2015 42 3 3 358-68