Diamondoid Hydrocarbons as Maturity Indicators for Condensates from Southern Indus Basin, Pakistan

Table 2

Diamondoid hydrocarbons identified in Southern Indus Basin condensates.

Peak number	Compound	Abbreviation	Molecular formula	Base peak (𝑚/𝑧)	M^+ (m/z)
1	1-Methyladamantane	1-MA	C11H18	135	150
2	2-Methyladamantane	2-MA	C11H18	135	150
3	1-Ethyladamantane	1-EtA	C12H20	135	164
4	2-Ethyladamantane	2-EtA	C12H20	135	164
5	Adamantane	A	C10H16	136	136
6	1,3-Dimethyladamantane	1,3-DMA	C12H20	149	164
7	1,4-Dimethyladamantane (cis)	1,4-DMA	C12H20	149	164
8	1,4-Dimethyladamantane (trans)	1,4-DMA	C12H20	149	164
9	1,2-Dimethyladamantane	1,2-DMA	C12H20	149	164
10	2,6-Dimethyladamantane + 2,4-dimethyladamantan	2,6-DMA + 2,4-DMA	C12H20	149	164
11	1,3,5-Trimethladamantane	1,3,5-TMA	C13H22	163	178
12	1,3,6-Trimethladamantane	1,3,6-TMA	C13H22	163	178
13	1,3,4-Trimethladamantane (cis)	1,3,4-TMA	C13H22	163	178
14	1,3,4-Trimethladamantane (trans)	1,3,4-TMA	C13H22	163	178
15	1-Ethyl, 3,5-dimethyladamantane	1-Et, 3,5-DMA	C14H24	163	192
16	1,3,5,7-Tetramethyladamantane	1,3,5,7-TeMA	C14H24	177	192
17	1,2,5,7-Tetramethyladamantane	12,5,7-TeMA	C14H24	177	192
18	4-Methyldiamantane	4-MD	C15H22	187	202
19	1-Methyldiamantane	1-MD	C15H22	187	202
20	3-Methyldiamantane	3-MD	C15H22	187	202
21	1-Ethyldiamantane	1-EtD	C16H24	187	216
22	2-Ethyldiamantane	2-EtD	C16H24	187	216
23	Diamantane	D	C14H20	188	188
24	4,9-Dimethyldiamantane	4,9-DMD	C16H24	201	216
25	1,2-Dimethyldiamantane + 2,4-dimethyldiamantane	1,2-DMD + 2,4-DMD	C16H24	201	216
26	4,8-Dimethyldiamantane	4,8-DMD	C16H24	201	216
27	3,4-Dimethyldiamantane	3,4-DMD	C16H24	201	216
28	Dimethyldiamantane 1	*NI	C16H24	201	216
29	Dimethyldiamantane 2	*NI	C16H24	201	216

∗NI: not identified.