Lower Jurassic Gas Exploration Potential and Direction in Tuha Basin
LI Zai-Guang, LIU Dun-Tian, CHEN Qi-Lin, LV Ti-Min, YANG Tie-Long, HUANG Yun-Feng, TIAN Bing
1. Northwest Branch, PetroChina Research Institute of Petroleum Exploration and Development, Lanzhou 730020, China;2. Research Institute of Exploration and Development, PetroChina Tuha Oil Field Company, Hami 839009, China;3. College of Geo\|Resources and Information, China University of Petroleum, Dongying 257061, China>
The study of gas\|oil ratio and formation temperature shows that J1 gas of Ke19 well, J2xcondensate gas reservoir of Qiudong area, and J2x—J2s condensate gas reservoir of Xiaocaohu area are similar, all of which are developed by oil\|gas cracking under long\|term high temperatures. It′s demonstrated that J1b gas strata in Kekeya are late\|dense gas reservoir, i.e. reservior that accumulated hydrocarbons at early stage (Later Jurassic\|Early Cretaceous). It evolves into today′s gas condensate reservoir from a paleoreservior. Certain gas-oil ratio hydrocarbon system, and higher formation temperature and pressure are the necessary conditions for the formation of condensate gas reservoirs. The Lower Jurassic gas reservoir are widely distributed in the Qiudong and Xiaocaohu areas, are mainly controlled by paleo\|structure. Based on trap description, it′s pointed out that Ledong and Hongqikan are the advantageous regions for gas exploration in the Lower Jurassic.
LI Zai-Guang, LIU Dun-Tian, CHEN Qi-Lin, LV Ti-Min, YANG Tie-Long, HUANG Yun-Feng, TIAN Bing. Lower Jurassic Gas Exploration Potential and Direction in Tuha Basin[J]. Nature Gas GeoScience, 2009, 20(3): 342-347.