The Depositional Environment Of Source Rock Measures And Geochemistry Characteristics Of Source Rocks In Jianchang-Kazuo Basin

Based on sedimentological and geochemical theories, this paper have studied and discussed more profoundly about the source rock measures of Jianchang-Kazuo basin. It had been discovered that source rocks of Beipiao formation are freshwater lacustrine and swamp facies deposits that formed in the weak reduction to reduction environment with shallow water table; source rocks of Jiufotang formation are freshwater to weak saltwater lacustrine facies deposits that formed in weak reduction to weak oxidative environments with more deeper water table. Meanwhile, the Beipiao formation is composed of fluvial system and lacustrine system and the Jiufotang formation is made up of fluvial system, braided river deltaic system and lacustrine system. Clearly formulated that source rocks of Beipiao formation are humic and sapropelic-humic type with high organic matter abundance that at immature stage; that of Jiufotang formation are sapropelic-humic and humic-sapropelic type with less high organic matter abundance that at less mature-mature stage. Then put forward an opinion that the structural evolution of the basin controls the development and distribution of facies belt of the sediment, and depositional environments determined life-forms and it's enrichment of source rocks while the original organic matters deposited. At last pointed out Siguanyingzi and Jianchang sub-depression are in better hydrocarbon generating conditions In the research area, and are profitable districts for searching oil and gas in the future.