DISTRIBUTION OF PRESENT-DAY GEOTHERMAL FIELD IN THE DONGPU SAG
Liu Li1, Ren Zhanli1, Cui Yingbin2, Zhang Sheng2
1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069; 2. Geological Scientific Research Institute, Shengli Oilfield Branch Company, China Petroleum & Chemical Corp., Dongying, Shandong 257015
The present-day temperature of the Dongpu Sag in the southern Bohai Bay Basin was analyzed.Based on the temperature data derived from nine exploration wells,temperature gradient was calculated and the distribution of temperature was analyzed.The deputation result of temperature gradient was 34℃/km and the mean heat flow was 58.4 mW/m2.The distribution of present-day temperature,affected by the basemental structures,was northeast-striking,which meant the higher and the lower temperatures in the depression and in the central uplift respectively.At the same horizon,the present-day temperature was an important controlling factor for oil-gas forming.The source rocks of Upper Paleozoic in the Eastern and Western Depressions were on the stage of secondary hydrocarbon generation,where might be a beneficial area of secondary hydrocarbon generation.