Formation and evolution of the reservoir space of subvolcanic reservoir: A case study of the well Dixi 18 area in Kelameili Gasfield
Received date: 2015-04-02
Revised date: 2015-06-08
Online published: 2016-02-10
Subvolcanic rocks are widely distributed in the well Dixi 18 area which is the most important reservoir rocks for the Carboniferous volcanic gas reservoirs in Kelameili Gasfield,of which secondary dissolution pores and tectonic fissures are the main reservoir space.Based on the observation and description of cores,this study conducted casting thin section,chemical element analysis,scanning electron microscope and cathode luminescence analysis to examine the controlling factors and the evolution governing laws,space development in the subvolcanic reservoir.This provides a theoretical basis for studies of the formation mechanisms of similar volcanic reservoirs in China.Formation of primary spaces is mainly controlled by magmatic condensation in the magmatic intrusive stage,while formation of secondary pore spaces is controlled by weathering and leaching process in the tectonic stage and deep burial diagenesis.The spatial location of the primary spaces produced in the magmatic intrusive stage is determined by the distribution of volcanic facies.Volcanic facies are the basis for highquality reservoirs.The tectonic stage is the main time when secondary pores are formed and fractures are formed under tectonism,connecting rocks with the atmosphere to form an open system environment.The fracture zone is a favorable reservoir distribution belt,and the structural position of volcanic rocks determines the development of fractures.The system became a closed system during the burial stage,which is the main period when reservoir spaces are redistributed and diagenesis changes the threedimensional spatial distribution of reservoirs.The dissolution of acid fluids and associated fillings leads to reservoir heterogeneity occurring inside the volcanic bodies.
Liu Xiaohong,Feng Mingyou,Xi Aihua,Xiong Yixue,Dong Bo,Zhao Meng,Duan Huajun . Formation and evolution of the reservoir space of subvolcanic reservoir: A case study of the well Dixi 18 area in Kelameili Gasfield[J]. Natural Gas Geoscience, 2016 , 27(2) : 278 -288 . DOI: 10.11764/j.issn.16721926.2016.02.0278
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