Origin,migration,and accumulation of carbon dioxide in the East Changde Gas Field,Songliao Basin,northeastern China  

作　　者：Yu-Ming Liu Yue Dong Zhen-Hua Rui Xue-Song Lu Xin-Mao Zhou Li-Chun Wei 

机构地区：[1]College of Geosciences,China University of Petroleum [2]School of Energy Resources,China University of Geosciences [3]Research Institute of Petroleum Exploration and Development,CNPC [4]Independent Project Association,Inc.

出　　处：《Petroleum Science》2018年第4期695-708,共14页石油科学（英文版）

基　　金：founded by the S&T development project ‘‘Key Factors Controlling Accumulation in Old Petroleum System (No. 2016A-0206)’’ by the China National Petroleum Corporation

摘　　要：CO2reservoirs are widely distributed within the Yingcheng Formation in the Songliao Basin, but the extreme horizontal heterogeneity of CO2content causes difficulties in the exploration and exploitation of methane. Former studies have fully covered the lithology, structure, and distribution of the reservoirs high in CO2content, but few are reported about migration and accumulation of CO2. Using the East Changde Gas Field as an example, we studied the accumulation mechanisms of CO2 gas. Two original types of accumulation model are proposed in this study. The fault-controlled accumulation model refers to gas accumulation in the reservoir body that is cut by a basement fault(the West Xu Fault), allowing the hydrocarbon gas generated in the lower formation to migrate into the reservoir body through the fault, which results in a relatively lower CO2content. The volcanic conduit-controlled accumulation model refers to a reservoir body that is not cut by the basement fault, which prevents the hydrocarbon gas from being mixed in and leads to higher CO2contents. This conclusion provides useful theories for prediction of CO2distribution in similar basins and reservoirs.CO_2 reservoirs are widely distributed within the Yingcheng Formation in the Songliao Basin, but the extreme horizontal heterogeneity of CO_2 content causes difficulties in the exploration and exploitation of methane. Former studies have fully covered the lithology, structure, and distribution of the reservoirs high in CO_2 content, but few are reported about migration and accumulation of CO_2. Using the East Changde Gas Field as an example, we studied the accumulation mechanisms of CO2 gas. Two original types of accumulation model are proposed in this study. The fault-controlled accumulation model refers to gas accumulation in the reservoir body that is cut by a basement fault(the West Xu Fault), allowing the hydrocarbon gas generated in the lower formation to migrate into the reservoir body through the fault, which results in a relatively lower CO_2 content. The volcanic conduit-controlled accumulation model refers to a reservoir body that is not cut by the basement fault, which prevents the hydrocarbon gas from being mixed in and leads to higher CO_2 contents. This conclusion provides useful theories for prediction of CO_2 distribution in similar basins and reservoirs.

关 键 词：Carbon dioxide reservoir Mantle-derived CO2 Faults Reservoir formation mechanism East Changde Gas Field Songliao Basin 

分 类 号：TE[石油与天然气工程]