The Comprehensive Evaluation on the Integral Development of Volcanic Gas Reserves and CO2 Flooding in Jilin Oil Field
Authors: Qing Xu , Qiquan Ran , Wenli Song , Guoli Chen , Dong Xiang , Yan Li 
Published: May 2016

Abstract
Pilot-CO2 flooding in Jilin Oil Field has been got a first base in recent years in order to ensure CO2 coming from the development of volcanic gas reserves is available for utilizing. The project has come into extended testing stage and will get into a Carbon Industry Chain(CIC) production stage of integral development of volcanic gas reserves and CO2 flooding. CIC will become a huge oil & gas development project, which composing volcanic gas reserves development, CO2 flooding and CO2 sequestration. The Project has its own characteristics of long cycle construction, superior technical difficulty and high investment risk. Therefore, evaluating micro & macro-benefit of CIC becomes a crucial element task for management promoting, successful financing and governmental support. Maximizing ROI (Return on Investment) of CIC has become a core objective and theory of hierarchy analysis has been utilized in order to set up a CIC comprehensive evaluation index system which contains society, economy, environment, resource, science & technology and management. Analytical method of hierarchy has been used for establishing CIC evaluation model proceed to the evaluation of the multi-effect of the CIC based on SAS, MAPLAB etc. The study achieves a prophase comprehensive evaluation of CIC in Jilin Oil Field. The results indicate that the CIC has a certain economic benefit and preferable macro performance. It may promote the development & production of CIC, enhance the utilizing of oil & gas resource and carbon emission reduction especially under high oil price condition.

Introduction
From the year of 2008, CNPC has begun pilot test for CO2 enhanced oil recovery (EOR) in Jilin Oil Field. The main purpose has three points:realization of CO2 emission reduction. According to China's Policies and Actions for Addressing Climate Change(2008), China's climate warming trend is basically consistent with the general trend globally. In the recent 50 years, the spatial distribution of precipitation has changed obviously in China, the sea level of coastal areas has risen by 90mm. As to ease the further aggravation of climate warming in future, we must find out the practical and effective methods to reduce emission of CO2 into the atmosphere during production and consumption of fossil fuels. Existing research and application results at home and abroad have shown that hydrocarbon reservoirs are well closed underground gas storages, which can realize long-term CO2 sequestration.Improvement of crude oil recovery. Lots of successful experience from indoor and field tests of CO2 flooding in America, Canada and Britain has shown that it has broad application prospects to CO2 flooding technology in raising the use rate of low permeability oil reservoir, crude oil recovery, recovery of thickened oil reservoir, natural gas recovery and coal bed methane (CBM) recovery, etc. In these years, pretty much of the developed oil fields have come into the middle and late stages of water flooding, of which the average recovery was only 32% and more than 70% of new producing reserves were low permeability reserves, therefore, development technologies having advantages over water flooding are urgently needed.Promotion of development of volcanic gas reservoirs. They have been successively discovered to CO2-containing natural gas reservoirs and high CO2-containing gas reservoir reserves at a large number since 2002 in Songliao Basin, to ensure safe and effective development of volcanic gas reservoirs, these works must be done well including separation, treatment, transportation, use and sequestration of CO2 gas in production gas, in order that natural gas resources can be developed and domestic natural gas supply and energy security can be improved.
Development of volcanic gas reservoirs as well as CO2 flooding and sequestration in Songliao Basin has formed a complementary CO2 industry chain, microcosmically, the industry chain not only promotes the development and production of unconventional natural gas reserves, but also promotes the technical progress in EOR, as well as enables R & D on CO2 geological sequestration technology; Macroscopically, it promotes the development of CO2 emission reduction and environmental protection technologies in China, and improves the energy security of domestic natural gas and oil.