Present Geothermal Fields of the Dongpu Sag in the Bohai Bay Basin  

作　　者：ZUO Yinhui QIU Nansheng HAO Qingqing ZHANG Yunxian PANG Xiongqi LI Zhongchao GAO Xia 

机构地区：[1]College of Energy Resources, Chengdu University of Technology [2]Research Institute of Exploration and Development,Zhongyuan Oilfield, SINOPEC [3]State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum [4]Research Center for Basin and Reservoir, China University of Petroleum [5]Institute of Mineral Resource Research,China Metallurgical Geology Bureau

出　　处：《Acta Geologica Sinica(English Edition)》2014年第3期915-930,共16页地质学报（英文版）

基　　金：granted by the Key Project of the National Natural Science Foundation of China (Grant Nos. 41125010, 91114202, 90914006);the key state science and technology projects (Grant No: 2011ZX05006-004);the National Basic Research Program of China (Grant No: 2011CB201100)

摘　　要：The Dongpu sag is located in the south of the Bohai Bay basin,China,and has abundant oil and gas reserves.To date,there has been no systematic documentation of its geothermal fields.This study measured the rock thermal conductivity of 324 cores from 47 wells,and calculated rock thermal conductivity for different formations.The geothermal gradient and terrestrial heat flow were calculated for 192 wells on basis of 892 formation-testing data from 523 wells.The results show that the Dongpu sag is characterized by a medium-temperature geothermal field between stable and active tectonic areas,with an average geothermal gradient of 32.0℃/km and terrestrial heat flow of 65.6 mW/m2.The geothermal fields in the Dongpu sag is significantly controlled by the Changyuan,Yellow River,and Lanliao basement faults.They developed in the Paleogene and the Dongying movement occurred at the Dongying Formation depositional period.The geothermal fields distribution has a similar characteristic to the tectonic framework of the Dongpu sag,namely two subsags,one uplift,one steep slope and one gentle slope.The oil and gas distribution is closely associated with the present geothermal fields.The work may provide constraints for reconstructing the thermal history and modeling source rock maturation evolution in the Dongpu sag.The Dongpu sag is located in the south of the Bohai Bay basin,China,and has abundant oil and gas reserves.To date,there has been no systematic documentation of its geothermal fields.This study measured the rock thermal conductivity of 324 cores from 47 wells,and calculated rock thermal conductivity for different formations.The geothermal gradient and terrestrial heat flow were calculated for 192 wells on basis of 892 formation-testing data from 523 wells.The results show that the Dongpu sag is characterized by a medium-temperature geothermal field between stable and active tectonic areas,with an average geothermal gradient of 32.0℃/km and terrestrial heat flow of 65.6 mW/m2.The geothermal fields in the Dongpu sag is significantly controlled by the Changyuan,Yellow River,and Lanliao basement faults.They developed in the Paleogene and the Dongying movement occurred at the Dongying Formation depositional period.The geothermal fields distribution has a similar characteristic to the tectonic framework of the Dongpu sag,namely two subsags,one uplift,one steep slope and one gentle slope.The oil and gas distribution is closely associated with the present geothermal fields.The work may provide constraints for reconstructing the thermal history and modeling source rock maturation evolution in the Dongpu sag.

关 键 词：Dongpu sag Bohai Bay basin present geothermal field thermal conductivity terrestrialheat flow 

分 类 号：P618.13[天文地球—矿床学]