Study on the influence of salt structural system on the distribution characteristics of potassium-rich brine reservoirs in Jiangling depression
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摘要:
江陵凹陷古新统沙市组及新沟嘴组均沉积有大量含盐岩层系, 受喜马拉雅运动影响, 形成各类盐隆构造。为了厘清江陵凹陷富钾卤水的分布特征, 重点研究了江陵凹陷的地层、断裂、构造分布特征, 探究盐隆构造体系对富钾卤水分布特征的影响。通过剖析江陵凹陷盐构造形成及演化特征, 认为盐隆构造控制的次级凹陷形成于盐层沉积的不同阶段, 汇集不同阶段的卤水, 成为盐类聚集的关键场所。江陵凹陷卤水钾离子主要来源于与断裂相伴的火成岩。富钾卤水重点分布于新沟嘴组下段及沙市组中, 其卤水储层包括砂岩储集层(李家台地区)、火山岩储集层(沙市地区、范家台地区)及破碎带储集体(南岗地区)。高矿化度富钾卤水在江陵凹陷内广泛分布, 具有较大的勘探潜力。
Abstract:A large number of salt-bearing rock systems were deposited in the Paleocene Shashi and Xinguzui group of the Jiangling depression, and various types of salt-ridge formations were formed under the influence of the Xishan movement.To clarify the distribution characteristics of potassium-rich brine in the Jiangling depression, we focus on the stratigraphic, fracture, and tectonic distribution characteristics of the Jiangling depression, and investigate the influence of the salt-ridge tectonic system on the distribution characteristics of potassium-rich brine.By analyzing the formation and evolution of the salt structure in the Jiangling Depression, it is concluded that the secondary depressions controlled by the Salt Rise Tectonics were formed at different stages of salt deposition, and brine from different stages was collected, which became the key place for salt accumulation.The potassium ions of the brine in the Jiangling depression mainly originate from the igneous rocks associated with the fractures.Potassium-rich brines are mainly distributed in the lower part of the Xinguzui group and the strata of the Shashi group, whose brine reservoirs include: sandstone reservoirs (Lijiatai area), volcanic reservoirs (Shashi and Fanjiatai area), and fracture zone reservoirs (Nangang area).The highly mineralized potassium-rich brines are widely distributed in the Jiangling depression and have a large exploration potential.
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