Organic geochemistry measurements and analyses were conducted on Carboniferous source rock samples from well Jican-1 and well Tacan-1.The results indicated that Carboniferous source rock in well Jican-1 predominantly consists of carbonaceous mudstones and that in well Tacan-1 predominantly consists of dark-colored mudstones. Both of the Carboniferous carbonaceous mudstones in well Jican-1 and dark mudstones in well Tacan-1 contain high abundance of organic matter, and are evaluated as good source rocks. Organic matters are mainly type III kerogens in the Carboniferous samples of well Jican-1 and well Tacan-1, and have been at the high-mature stage with large gas source potential.