Relationship Between Gas Carbon Isotope and Maturity in the Craton Basin, Tarim Basin

摘要

Carbon isotopes of natural gases are controlled not only by source and mature effect, ]but also by accumulating (leakage and mixing) effect. The gases, bistributed in the three pale- o-uplifts, Tazhong, Tabei and Bachu in the Tarim Basin, are generated mainly from Cambrian and Lower Ordovician hydrocarbon-source rocks. Being under good preservation conditions, gas pools in the Tazhong region experienced a long accumulation period, resulting in a successive gas accumulation region in this region.