Geochemical Characteristics of Upper Permian Source Rocks and Exploration Directions in Dabancheng SubDepression of Chaiwopu Depression

Key words: 
• Junggar basin /
• Chaiwopu depression /
• source rock /
• geochemical characteristics /
• exploration direction

Abstract: The paper systematically studied source rocks of Well Chaican1Ce1, Da1 and Section of Xiaopingcaogou, Dabancheng SubDepression of Chaiwopu Depression. It shows that organic macerals of the source rocks are mainly composed of vitrinite. Source rocks of Well Chaican1Ce1 and Da1 have high maturity, but lower abundance of organic matter, and low potential of oil generation. Source rocks of Section Xiaopingcaogou have higher maturity and higher concentration of organic matter, concentration of TOC amount to 3.87% at most, at the same time, oil generation potential of P2l are much more great than P2h. All the sources of the organic matter are mainly from terrestrial higher plant, and formed in the reductive lake environment of saline or water column stratification environment. The best source rocks of Upper Permian are distributed in the northeast of the Sub-depression. Oil and gas generated in the northeast〖KG*2〗moved to the southwest, the higher part of the slope through fault and permeable carrier layer, and accumulated in the favorable place of strata and structure. As a result, higher place of slope is the favored direction of exploration.