Multiphase tectonic movements, cap formations and evolution of the Majiang paleo-reservoir  

作　　者：Tang Liangjie Cui Min 

机构地区：[1]State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China [2]CNOOC Research Institute, Beijing 100027, China

出　　处：《Petroleum Science》2011年第2期127-133,共7页石油科学（英文版）

基　　金：support from the National Natural Science Foundation of China(Grant Nos.40972090,40672143 and 40172076);the National Major Fundamental Research and Development Project(Grant Nos.2005CB422107 and G1999043305);the National Science and Technology Project(Grant Nos.2008ZX05005-002-04-02)

摘　　要：The Majiang paleo-reservoir is a typical destroyed hydrocarbon reservoir, buried in carbonate strata of China＇s southern marine-facies. Field geological explorations, interpretations of seismic profiles and balanced cross-section restorations around this paleo-reservoir reveal that its formation and evolution have been restricted by multiphase tectonic movements of different intensities. A regional tectonic mechanism and model have been suggested for the formation and evolution of the Majiang paleo- reservoir. Geological field exploration has been carried out along three typical Silurian cross-sections and rock samples were tested in combination with water-rock interaction. Based on the result of cap tests, the planar distribution, the residual thickness, the erosion thickness and the preservation conditions, the Silurian mudstone cap is discussed around the Majiang paleo-reservoir. Combining the hydrodynamic conditions of its formation and evolution and its tectonic movements, we determined the fact that the thicker the cap is, the more resistant it is to hydrodynamic destruction. The multi-phase formation and destructive geological model of the paleo-reservoir is established through an overall analysis of multi- phase tectonic evolutions, cap developments, hydrodynamic conditions and solid mineral metallogenic ages measured by Rb-Sr, Pb and Sm-Nd isotope techniques.The Majiang paleo-reservoir is a typical destroyed hydrocarbon reservoir, buried in carbonate strata of China＇s southern marine-facies. Field geological explorations, interpretations of seismic profiles and balanced cross-section restorations around this paleo-reservoir reveal that its formation and evolution have been restricted by multiphase tectonic movements of different intensities. A regional tectonic mechanism and model have been suggested for the formation and evolution of the Majiang paleo- reservoir. Geological field exploration has been carried out along three typical Silurian cross-sections and rock samples were tested in combination with water-rock interaction. Based on the result of cap tests, the planar distribution, the residual thickness, the erosion thickness and the preservation conditions, the Silurian mudstone cap is discussed around the Majiang paleo-reservoir. Combining the hydrodynamic conditions of its formation and evolution and its tectonic movements, we determined the fact that the thicker the cap is, the more resistant it is to hydrodynamic destruction. The multi-phase formation and destructive geological model of the paleo-reservoir is established through an overall analysis of multi- phase tectonic evolutions, cap developments, hydrodynamic conditions and solid mineral metallogenic ages measured by Rb-Sr, Pb and Sm-Nd isotope techniques.

关 键 词：Multiphase tectonic evolution key tectonic changes cap evolution hydrocarbonpreservation Majiang paleo-reservoir 

分 类 号：P618.130.2[天文地球—矿床学] P542[天文地球—地质学]