Quantitative analysis of the effect of salt on geothermal temperature and source rock evolution: A case study of Kuqa foreland basin, Western China
WU Hai, ZHAO Mengjun, ZHUO Qingong, LU Xuesong, GUI Lili, LI Weiqiang, XU Zuxin
1. Key Laboratory of Basin Structure and Hydrocarbon Accumulation, CNPC, Beijing 100083, China; 2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China; 3. School of Geosciences, Yangtze University, Wuhan 430100, China
Abstract：There develop two sets of thick salt in the Kuqa foreland basin, the impact of salt thickness on geothermal temperature and thermal evolution of source rock was analyzed using transient thermal modeling method based on the two dimensional seismic profile from west to east of the basin and the related boundary condition. The results indicate that: (1) the change of salt plies will not have different impact on geothermal temperature when the total thickness of the salt body is constant; (2) the geothermal temperature of formations above the gypsum will increase about 0.3-0.6 ℃/100 m, while the subsalt geothermal temperature will decrease about 0.6-1.0 ℃/100 m in the west of the basin; the geothermal temperature of formations above the salt will increase about 1.9-2.3 ℃/100 m, while the subsalt geothermal temperature will decrease about 0.2-2.6 ℃/100 m in the east of the basin; (3) the value of vitrinite reflectance will be lagged about 0.02%/100 m averagely in the west of the basin, and will be lagged about 0.05%/100 m in the east. As the thermal conductivity of gypsum-salt rock is negatively correlated with temperature, the salt body in the east has a shallower burial and lower geothermal temperature, so its overall thermal conductivity is higher, causing the changing rates of geothermal temperature and Ro are higher than the west. A case study of Dina 2 condensate field of Kuqa foreland basin indicates that the charge time of hydrocarbon there lagged about 7.5-9.0 Ma because of the delayed source rock thermal evolution caused by the salt, matching well with the formation period of trap, which is favorable for the late accumulation of hydrocarbon in this area.
吴海, 赵孟军, 卓勤功, 鲁雪松, 桂丽黎, 李伟强, 徐祖新. 膏盐岩对地层温度及烃源岩热演化的影响定量分析——以塔里木库车前陆盆地为例[J]. 石油勘探与开发, 2016, 43(4): 550-558.
WU Hai, ZHAO Mengjun, ZHUO Qingong, LU Xuesong, GUI Lili, LI Weiqiang, XU Zuxin. Quantitative analysis of the effect of salt on geothermal temperature and source rock evolution: A case study of Kuqa foreland basin, Western China[J]. , 2016, 43(4): 550-558.
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2016, Vol. 43 
