STRUCTURE TRAPS AND PETROLEUM EXPLORATION POTENTIALS OF THE QIULITAGE STRUCTURE BELT IN THE KUQA BASIN, NW CHINA
He Guangyu1, Lu Huafu2, Li Shuxin3
1. Department of Earth Sciences, Zhejiang University, Hangzhou 310027; 2. Department of Earth Sciences, Nanjing University, Nanjing 210093; 3. Research Center of Petroleum Geophysical Prospecting Bureau, Tulufan, Xinjiang 838000
There was a layering character from shallow to deep for structure traps of the Qiulitage structure belt in the Kuqa Basin, northwest Tarim. The shallow structure traps, which were located above the Paleogene salt layers, included mainly fault-propagation fold, detachment fold and salt fold. The deep structure traps, located below the Paleogene salt layers, were mainly composed of fault-bend fold and superposition of fault-bend fold. Both of them had different reservoir-caprock associations. Namely, the shallow traps had the reservoirs and caprocks of the Paleogene and Neogene Jidike, Kangcun sandstones, and the Neogene Kuqa mudstones respectively; the deep traps had the ones of the Triassic, Jurassic and Cretaceous sandstones, and the Paleogene salt layers respectively. Based on the petroleum geological features, the authors presented the oil and gas potential for the near future to explore in this area as follows: the east and the deep ones might be more promising than that of the west and the shallow.