Formation mechanism of in-situ volcanic reservoirs in eastern China:A case study from Xushen gasfield in Songliao Basin  

作　　者：FENG ZiHui YIN ChangHai LIU JiaJun ZHU YingKang LU JiaMin LI JiangHai 

机构地区：[1]Exploration and Development Research Institute,Daqing Oilfield Company Ltd. [2]School of Earth and Space Science, Peking University

出　　处：《Science China Earth Sciences》2014年第12期2998-3014,共17页中国科学（地球科学英文版）

基　　金：supported by the National Basic Research Program of China(Grant No.2009CB219308)

摘　　要：A large number of in-situ volcanic reservoirs have been discovered from the Meso-Cenozoic rift basin group in eastern China.Based on drilling results in combination with geological and geophysical analysis,a case study from the Early Cretaceous Xujiaweizi fault-depression shows that the formation mechanism of in-situ volcanic reservoirs is characterized by"fault-controlled body,body-controlled facies,facies-controlled reservoir,and reservoir-controlled accumulation".In other words,deep faults control the volcanic eruption type,volcanic body,and gas reservoir distribution;the volcanic body determines the spatial distribution of volcanic facies and volcanic gas reservoir size;the volcanic facies control reservoir physical properties and effective thickness of gas formation;the volcanic reservoir properties control gas reservoir type and gas productivity.The result is useful to guiding the discovery of in-situ volcanic gas reservoirs in faulted basins in both theory and practice.A large number of in-situ volcanic reservoirs have been discovered from the Meso-Cenozoic rift basin group in eastern China. Based on drilling results in combination with geological and geophysical analysis, a case study from the Early Cretaceous Xujiaweizi fault-depression shows that the formation mechanism of in-situ volcanic reservoirs is characterized by ＂fault-controlled body, body-controlled facies, facies-controlled reservoir, and reservoir-controlled accumulation＂. In other words, deep faults control the volcanic eruption type, volcanic body, and gas reservoir distribution; the volcanic body determines the spatial distribution of volcanic facies and volcanic gas reservoir size; the volcanic facies control reservoir physical properties and effective thickness of gas formation; the volcanic reservoir properties control gas reservoir type and gas productivity. The result is useful to guiding the discovery of in-situ volcanic gas reservoirs in faulted basins in both theory and practice.

关 键 词：Songliao Basin in-situ volcanic reservoir volcanic eruption type volcanic facies belt volcanic eruption cycle 

分 类 号：P618.13[天文地球—矿床学]