Carbon capture, utilization and storage (CCUS) is an all-inclusive technology for fossil energy to achieve large-scale carbon emission reduction and ultimately achieve the goal of carbon neutrality, but its problems of high cost and low income restrict the demonstration and large-scale development of CCUS industry. In order to promote the development of CCUS industry in the Sichuan-Chongqing area, this paper systematically sorts out domestic and foreign CCUS industrial development policies. Then, with a hypothetical CCUS-ERG demonstration project as an example, the investment cost is analyzed, and the project economy under different government subsidies and carbon prices is calculated, so as to provide reference for the support policy level of CCUS demonstration project in the Sichuan-Chongqing area. And the following research results are obtained. First, in the case of medium carbon price, the government subsidy level to reach the break even point is 145.50 yuan/t-285.50 yuan/t. Second, increasing the scale of geological storage is conducive to the decrease of the subsidy level. In the case of medium carbon price, the government subsidy level to reach the break even point can be reduced by 30-80 yuan/t if the CO₂ reinjection scale is doubled. Finally, in order to better promote the demonstration and large-scale development of CCUS industry, expand the scale of CCUS projects and reduce costs, three suggestions are put forward: First, Sichuan's and Chongqing's local governments shall accelerate the formulation of government subsidies, industrial funds, low interest loans and other policies to support the development of CCUS industry; Second, it is necessary to promote the link between CCUS and carbon trading market, and realize the carbon price benefits of CCUS projects through CCER or local CER; Third, it is suggested to link internal and external carbon sources and sinks through source-sink match , and expand the scale of CCUS projects to reduce costs.

Under the background of "carbon peaking and carbon neutrality", carbon asset development is an important means to improve the energy conservation & emission reduction and the economic benefits of new energy projects, and it helps oil & gasfield enterprises achieve carbon peaking and large-scale benefit development of new energy business on schedule. In order to speed up the green and low-carbon transformation and development of oil & gasfield enterprises and assist the achievement of the "dual carbon" goal, this paper systematically sorts out domestic and foreign carbon asset development systems, analyzes key directions of carbon asset development of oil & gasfield enterprises, and proposes development paths of carbon asset. And the following research results are obtained. First, the carbon asset development of oil & gasfield enterprises mainly focuses on methane emission reduction and recycling, waste heat and pressure utilization, renewable energy/new energy utilization, and CO₂ capture, utilization and storage (CCUS) projects. Second, large-scale grid connected renewable energy projects (such as wind and solar power) can be prepared to apply for national CCER, while small-scale distributed photovoltaic, geothermal energy utilization and other renewable energy projects that are not connected to the grid, as well as self use projects (such as waste heat and pressure) and oil & gasfield emission reduction projects (such as associated gas recovery and escaping methane recovery) can apply for UER projects and VCS projects simultaneously. Third, as for the associated gas recovery and utilization projects of oil & gasfields, there is only the emission reduction methodology for oil fields. Gas mining projects need to be properly optimized. The emission reduction mechanisms and methodologies of waste pressure and heat utilization and renewable energy/new energy utilization have been well developed. As for CCUS, it is suggested to cooperate with the third party to develop new methodologies. Fourth, It is recommended that oil & gasfield enterprises figure out their exploitable resources of carbon assets in advance, establish a professional carbon asset development management team, and start the development of emission reduction projects in time according to local conditions.

Oil & gas fields are rich in pressure energy resources and have great potential to develop and utilize waste natural pressure gas for power generation. The current technologies and equipment are still not mature enough, which impacts the large-scale benefit development of waste pressure power generation project, so it is in urgent need to improve the economy of the project through carbon asset development. In order to promote the healthy and sustainable development of the waste natural gas pressure power generation industry and help oil & gasfield enterprises achieve the "dual carbon" goal as scheduled and the large-scale benefit development of new energy business, this paper evaluates the feasibility of the carbon asset development of the oil & gasfield's waste pressure power generation project, measures the impact of carbon asset development on the income of waste natural gas pressure power generation project, and analyzes the feasibility of the carbon asset development of the project. And the following research results are obtained. First, referring to the current carbon market price, the annual emission reduction income per unit installed capacity of waste natural gas pressure power generation is 188 yuan/kWh, which is much higher than that of onshore wind power and photovoltaic project, but the annual emission reduction income per unit investment is lower than that of onshore wind power project and basically the same as that of photovoltaic projects. Second, the feasibility of carbon asset development of waste pressure power generation project is demonstrated from the aspects of methodology, additionality, monitoring feasibility, emission reduction and income evaluation. Third, there is no technical difficulty in carbon asset development and monitoring management of waste natural gas pressure power generation project, but due to the small scale of the project, the development income of a single project is not economically feasible. It is suggested to design multiple project feasibility schemes as a whole and perform bundled development of carbon assets. Fourth, the carbon asset development of waste pressure power generation can be promoted by taking the following 4 measures, i.e., improving the development rules for special types of projects, establishing positive technology list suitable for China's "dual carbon" work development strategy, adopting digital management to improve development efficiency, and applying carbon financial tools.