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CO2 storage in depleted oil and gas fields in the Gulf of Mexico
International Journal of Greenhouse Gas Control ( IF 3.9 ) Pub Date : 2018-03-20 , DOI: 10.1016/j.ijggc.2018.02.022
Elif Agartan , Manohar Gaddipati , Yeung Yip , Bill Savage , Chet Ozgen

Depleted oil and gas reservoirs are one of the prime-candidate formations for geologic CO2 storage. Although both the geological structure and the physical properties of most of them have been extensively studied and characterized, there is limited data on the assessment of the CO2 storage capacity, especially in the offshore fields. The purpose of this study is to develop a high-level quantitative assessment of the CO2 volume that can be stored in depleted oil and gas fields in the Federal offshore regions of the Gulf of Mexico (GOM), both on a field-by-field and on a reservoir-by-reservoir basis. In this study, we simulated CO2 storage in 461 of the depleted oil and gas reservoirs (73 fields) among 3514 reservoirs (675 fields) in the GOM (2013 BOEM Reserves database). Based on the simulation results, we improved the Department of Energy (DOE) CO2 Storage Resource Estimate Equation to make more refined and accurate estimates of storable CO2 volumes. Newly revised efficiency factor (ERoil/gas) correlates better with hydrocarbon recovery factor (HCRF), which is found to be a strong indicator of the CO2 storage capacity of the reservoir. The higher HCRF results in higher ERoil/gas. The further investigations resulted in an improved, material balance-based correlation—which is called the Production-CO2 Storage Correlation—between cumulative production (free gas, oil and water) at reservoir conditions and CO2 storage volume at standard conditions. This relationship, which is unique for all three types of reservoirs (gas, oil and combination), allows for making direct estimates of CO2 storage volume using only existing production data. Application of these correlations to all of the depleted fields (3514 reservoirs) yields CO2 storage capacities of 4748 MMtons, and the CO2 storage capacity in all 1295 depleted and active fields (13,289 reservoirs) in the GOM calculated to be 21.57 Billion tons. If a 5000 psia surface injection pressure constraint was applied, these volumes would be reduced to 4075 MMtons for all depleted fields only and to 15.80 Billion tons for all depleted and active fields in the GOM. The production-CO2 storage correlations can be used to make more accurate CO2 storage volume estimates in all onshore and offshore depleted oil and gas fields.



中文翻译:

墨西哥湾枯竭的油气田中的CO 2储存

枯竭的油气藏是地质CO 2储存的主要候选地层之一。尽管对其中大多数的地质结构和物理性质都进行了广泛的研究和表征,但有关CO 2储存能力评估的数据有限,尤其是在海上油田。这项研究的目的是对可在墨西哥湾联邦离岸地区(GOM)中的枯竭油气田中储存的CO 2量进行高水平定量评估,这两种方法都可以逐场进行。油田,并在每个储层的基础上。在这项研究中,我们模拟了CO 2GOM(2013 BOEM Reserves数据库)中的3514个储层(675田)中的461个已枯竭的油气储层(73田)。基于模拟结果,我们改进了能源部(DOE)的CO 2储存资源估算公式,以便对可存储的CO 2量进行更精确,更准确的估算。新修订的效率因数(E Roil / gas)与碳氢化合物采收率(HCRF)具有更好的相关性,这是油气藏CO 2储存能力的有力指标。较高的HCRF导致较高的E Roil / gas。进一步的研究导致基于物料平衡的相关性得到了改善,这被称为生产CO2储存关联-在储层条件下的累计产量(游离气,油和水)与标准条件下的CO 2储存量之间。这种关系对于所有三种类型的储集层(天然气,石油和天然气储集层)都是唯一的,可以仅使用现有的生产数据直接估算CO 2的存储量。将这些相关性应用于所有贫乏油田(3514个油藏)会产生4748 MMtons的CO 2储存能力,并且CO 2据估计,GOM中所有1295个枯竭和活动的油田(13,289个水库)的存储容量为215.7亿吨。如果施加5000 psia的地面注入压力约束,那么这些量将仅对GOM中的所有枯竭油田减少到4075 MM吨,而对于GOM中所有枯竭和活动油田减少到158亿吨。生产中的CO 2储存相关性可用于在所有陆上和海上贫乏油气田中更准确地估算CO 2储存量。

更新日期:2018-03-20
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