A set of Late Carboniferous Hala'alat gray dark mudstones distribute in the Hala'alat Mountains area Northwest Junggar Basin. These mudstones are one of the major hydrocarbon source rocks of the Carboniferous oil field in this area. However，to date，the depositional environment and organic matter enrichment factors are still unclear. On the basis of detailed study the sedimentology and petrology of the Wu-He Road section of the Late Carboniferous Hala'alat Formation in the Hala'alat Moutains，Northwest Junggar，seventeen fresh mudstone samples were collected，and then the mudstone samples were carried on the experiments of total organic carbon content，major elements and trace elements. Several viewpoints are concluded by the comprehensive analysis the field investigation results and experiment data. 1）The Hala'alat mudstones were deposited in a semi-deep to deep sea environment，and influenced by frequency turbidity flow，which caused the bottom water in a turbulent environment from oxic to suboxic；2）low values of V/Cr，U/Th，V and U，show that the mudstones deposited in a more oxidation tendency environment；3）high contents of P and Ni reflect a relatively high paleo-productivity of the marine；4）on the background of relatively high paleo-productivity，but the total organic carbon content of the Hala'alat mudstones are relatively low （TOC avg. 0.49%），reflecting the oxidation environment is the major controlling factors. Therefore，the redox conditions are the primary controlling factors of the Hala'alat mudstones'organic carbon enrichment.
Tao Huifei Qiu Zhen Ji Hongjie Qiu Junli. Sedimentary environment and organic carbon enrichment factors of the Late Carboniferous Hala'alat hydrocarbon source rocks in West Junggar[J]. Chinese Journal of Geology, 2017, 52(1): 79-92.