气田水锂、溴资源定量计算方法和前景展望——以W气田震旦系气藏为例

Quantitative calculation methods and prospects for lithium and bromine resources in gas field water:A case from Sinian gas reservoir in W gas field

目的鉴于国内部分气田地层水中丰富的锂、溴资源,为明确气田水开发的综合利用价值,定量计算和评估锂、溴总体资源量。方法基于地质分析法,提出一种定量计算已开发气田地层水(以下简称气田水)中锂、溴资源量的新方法,并结合行业内提锂、提溴工艺,计算气田水可提取的碳酸锂、溴素等工业原料资源量。结果①W气田震旦系气藏为具有统一气水界面的底水气藏,气田水总地质储量为29.92×10^(8)m^(3);②采用矿化度约束权衡法、井点面积权衡法、等值线面积权衡法分别计算气田水锂元素、溴元素的平均含量,最终确定气田水中锂元素和溴元素的平均质量浓度分别为114.8 mg/L和181.7 mg/L;③综合水体储量和锂、溴元素含量,定量计算气田水锂元素总量为34.35×10^(4)t,溴元素总量为54.37×10^(4)t;④基于气田水锂、溴元素含量,预测可提取工业产品碳酸锂146.19×10^(4)t,溴素144.19×10^(4)t。结论基于已开发气田气藏特点和气田水开发综合利用行业新热点,定量评估锂、溴资源量,结合提锂、溴工艺技术,形成气田水开发综合利用新链条,为国内外同类型气田的有效开发和新能源利用提供借鉴。

Objective Given the abundant lithium and bromium resources in the formation water of some gas fields in China,to clarify the comprehensive utilization value of gas field water development,the total resources of lithium and bromium are quantitatively calculated and evaluated.Methods Based on the comprehensive geological method,this paper innovatively proposes a new method for quantitative calculation of lithium and bromium resources for the developed gas field formation water(hereinafter referred to as gas field water).It calculates the industrial raw materials such as lithium carbonate and bromine that can be extracted from the whole gas reservoir in combination with the latest lithium and bromium extraction process.Results Firstly,W gas reservoir is a bottom water gas reservoir with a unified gas-water interface,with a total formation water reserve of 2.992×10^(9) m^(3).Secondly,the mineralization degree constraint,well point area,and contour area balance methods were used to calculate the average content of lithium and bromine in the gas reservoir.As a results,it has been determined that the average mass concentration of lithium and bromium in gas field water is 114.8 mg/L and 181.7 mg/L,respectively.Thirdly,based on the water reserves and the content of lithium and bromium,the quantitative calculation of the total lithium content in gas field water is 0.3435×10^(6) t,and the total bromium content is 0.5437×10^(6) t.Fourthly,based on the content of lithium and bromium resources,it is predicted to extract 1.4619×10^(6) t lithium carbonate and 1.4419×10^(6) t bromine.Conclusions Based on the current development status of developed gas fields,combined with the utilization of new energy in gas field development,this article innovatively proposes a new method for quantitatively calculating lithium and bromium resources extracted from gas field water,providing certain guiding significance for the effective development and new energy utilization of similar gas fields at home and abroad.