Diagenetic evolution and controlling factors of pyroclastic reservoirs of the Lower Cretaceous in Nanbeier Sag，Hailar-Tamtsag Basin
Zhang Liyuan1, Ji Youliang1, Liu Li2, Meng Qi′an3,Zhao Lei1, Yu Miao2, Zhou Bing2
1 State Key Laboratory of Petroleum Resource and Prospecting，China University of Petroleum(Beijing)，Beijing102249; 2 College of Earth Sciences，Jilin University，Changchun130061，Jilin; 3 Exploration and Development Research Institute，Daqing Oilfield Ltd Co.，Daqing163712，Heilongjiang
Through various measurements，such as analyses of normal thin-sections，cast thin-sections，scanning electron microscope and X-ray diffraction of clay minerals，this paper systematically studies the diagenetic evolution and controlling factors of pyroclastic reservoirs from the Tongbomiao and Nantun Formations of Lower Cretaceous in Nanbeier Sag of Hailar-Tamtsag Basin.It is considered that the diagenesis types of the reservoirs include weldition，compaction，devitrification，alteration，cementation and dissolution.The main diagenesis stage is the middle diagenetic stage A.The reservoirs undergo the evolution process from syngenesis diagenetic stage to middle diagenetic stage A，part of which experience the evolution process of epidiagenetic stage.Different diagenetic evolution stages have different characteristics.The syngenesis diagenetic stage is characterized by weldition and weak cementation.While the early diagenetic stage A is featured by strong compaction and weak cementation.The early diagenetic stage B has strong compaction，weak cementation and weak dissolution.When it comes to middle diagenetic stage A，compaction becomes moderate，on the other side，compaction and dissolution get stronger.The epidiagenetic stage differs from others by meteoric water leaching.The diagenetic evolution process is controled by diagenesis environment，tectonism and volcanic activities.The diagenetic environments undego the evolution process from weak alkali to weak acidic，then acidic to alkali environments.In the acidic diagenetic environment，dissolution takes place.While，in the alkali diagenetic environment，cementation dominates.Tectonism and volcanic activities influences the diagenetic evolution process by controlling the origin of pyroclastic components，the occurrence of fractures，thermal fluid activities and the evolution of epidiagenetic stage.
Zhang Liyuan,Ji Youliang,Liu Li et al. Diagenetic evolution and controlling factors of pyroclastic reservoirs of the Lower Cretaceous in Nanbeier Sag，Hailar-Tamtsag Basin[J]. JOPC, 2013, 15(2): 261-274.
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