Geological characteristics and hydrocarbon potential between epicontinental and intracontinental foreland basins
JIN Zhi-jun 1,2 TANG Liang-jie 1,2 YANG Ming-hui 1,2 WANG Qing-chen 3 (1.Basin Research Center,University of Petroleum,Beijing 102249,China; 2.Key Laboratory for Hydrocarbon Accumulation in the University of Petroleum,Ministry of Education,Beijing 102249,China; 3.Institute of Geology and Geophysics, Chinese Academy of Science,Beijing 100029,China)
According to the tectonic evolution,structure of section,sequence relationship and source-reservoir-cap composition of foreland basins,the foreland basins can be divided into two types including epicontinental foreland basin and intracontinental foreland basin.The former includes peripheral foreland basin and retro?-arc foreland basin.There are some differences between the two types of foreland basins:(1) The epicontinental foreland basin went through passive continental margin or retro?-arc rift stage during tectonic evolution stage,but the intracontinental foreland basin lacked this period.(2) For the texture of sequences,the tectonic-sequence of the epicontinental foreland basin lain on the marine passive continental margin sequence or retro?-arc rift sequence,and the intracontinental foreland basin lacked of marine sequence in generally.(3) On the genetic mechanism,the forming of the epicontinental foreland basin was related to the collided orogenic belt or retro?-arc orogeny,and the intracontinental foreland basin was related to the rejuvenated orogenic belt.(4) On the characters of hydrocarbon development,the epicontinental foreland basin developed marine and non-marine source rocks,and the intracontinental foreland basin mainly developed non-marine source rocks.The differences of geological characteristics and hydrocarbon potentials between the epicontinental foreland basin and intracontinental foreland basin are obvious.