Study On Analysis Of Physical Parameters And Accurate Modeling Of CO₂ Storage Geology

In 2015,China and the United States issued the joint statement on climate change of the head of state of China and the United States on improving global climate,promoting global investment in low-carbon technologies and low-carbon solutions.The capture,utilization and storage technology of CO₂(CCUS)proposed in the statement is the most practical and possible way to reduce carbon emission.CO₂ geological storage is a kind of technology that can capture and compress CO₂ and transport it to the storage site for burial storage.In September 2015,Yan'an Yulin area operated by Shaanxi Yanchang Petroleum Group was included as the site of carbon capture,utilization and storage project in the first Sino US dollar joint statement on climate change,which promoted the dialogue and cooperation between China and the United States on CCUS.The research of this paper is based on the CO₂ storage project of Yanchang Petroleum.It analyzes the physical parameters and 3D geological modeling of Huaziping oilfield area,determines the geological and physical characteristics of the area,and provides strong technical support for the later CO₂ injection and storage.This paper mainly analyzes the physical parameters of Chang 6 gas reservoir,and compares the porosity and permeability characteristics of the target gas reservoir with the results of sampling core detection.The three-dimensional geological model is mainly used for detailed modeling of the Chang 4+5 and Chang 6formations of Yanchang formation,and numerical simulation of carbon dioxide injection and storage is carried out according to its porosity permeability and other attribute models.The specific research contents are as follows:1.Collect the geological and logging data in the study area to determine the formation information,lithofacies data and attribute parameters in the study area;2.Analyze and study the physical parameters of Chang 6 gas reservoir in combination with the development data and sampling core detection data in Huaziping study area,and provide data basis for 3D modeling;3 Based on the data of well location,stratification and logging curve,the modeling range of the study area is determined.The structural model,facies model and attribute model are established successively.The geological models of formation structure,lithology characteristics,porosity and permeability are determined,and the state of CO₂ storage and migration is preliminarily simulated.4.Based on the established model and the numerical simulation software of carbon dioxide sequestration,the diffusion concentration,solubility of carbon dioxide and the change of formation stress are studied.Based on the analysis of physical parameters of rock samples,this paper establishes a three-dimensional geological model of Huaziping area,which clearly and accurately shows the advantages of structural framework,lithologic distribution and attribute characteristics in this geological storage.At the same time,it simulates the effect of CO₂ storage,preliminarily predicts the leakage,migration and diffusion distribution of carbon dioxide gas,as well as the solubility after gas injection The preliminary understanding of gas concentration and formation stress proves that Chang 4+5 stratum as cap and Chang 6 stratum as reservoir have good sealing and connectivity.This study on physical property analysis and 3D geological precise modeling of Huaziping area also provides reference for other areas'carbon dioxide sealing projects.