CAJ | 학술논문

柴达木盆地西部第三系油田水具有高矿化度特征，钾、硼、锂等离子达到工业开采品位，氢同位素值分布在-75.61‰～13.35‰，氧同位素值分布在-7.68‰～10.58‰。综合分析油田水化学成分、水化学参数组合以及氢氧同位素特征推断：柴达木盆地西部第三系油田水起源于大气降水，为典型陆相成因，为大气降水沿深大断裂下渗并经历了“深循环”作用形成，同时有深源岩浆流体的参与。油田水高矿化度特征与盐类矿物溶解和蒸发浓缩有关，钾、硼、锂等元素受深源流体控制，Ca2＋和HCO3-主要来源于碳酸盐矿物溶解，油田水高Ca2＋、低Mg2＋的特征与演化过程中白云石交代方解石以及方解石溶解有关，充分的水-岩反应与深源流体的加入导致柴达木盆地西部第三系深成CaCl 2型油田水的形成。同时，初步推断南翼山地区第三系可能具有找钾意义。
시체목분지서부제삼계유전수구유고광화도특정，갑、붕、리등리자체도공업개채품위，경동위소치분포재-75.61‰～13.35‰，양동위소치분포재-7.68‰～10.58‰。종합분석유전수화학성분、수화학삼수조합이급경양동위소특정추단：시체목분지서부제삼계유전수기원우대기강수，위전형륙상성인，위대기강수연심대단렬하삼병경력료“심순배”작용형성，동시유심원암장류체적삼여。유전수고광화도특정여염류광물용해화증발농축유관，갑、붕、리등원소수심원류체공제，Ca2＋화HCO3-주요래원우탄산염광물용해，유전수고Ca2＋、저Mg2＋적특정여연화과정중백운석교대방해석이급방해석용해유관，충분적수-암반응여심원류체적가입도치시체목분지서부제삼계심성CaCl 2형유전수적형성。동시，초보추단남익산지구제삼계가능구유조갑의의。
The elements and hydrogen and oxygen isotope geochemistry analysis of oilfield water in the Tertiary in western Qaidam basin shows high salinity and abundant ions of potassium ,boron and lithium of industrial mining grade .The anal-ysis also reveals a hydrogen isotope value distribution of 75.61‰to 13.35‰and an oxygen isotope value distribution be-tween -7.68‰and 10.58‰.Combining these results with chemical analysis of the water ,we concluded that the water was of typical terrestrial origin and was sourced from meteoric water ,which seeped down along deep faults and was in-fluenced by deep-sourced magmatic fluids during its “deep circulation”.The high salinity of the water may be caused by dissolution of saline minerals and their concentration through evaporation .Potassium,boron and lithium are mostly con-trolled by deep-sourced fluids and ions like Ca 2+and HCO3-are mainly sourced from dissolution of carbonate minerals . High concentration of calcium ion and low concentration of bicarbonate radical are thought to be linked to replacement of calcite by dolomite and dissolution of calcite .The formation of CaCl 2 type water is therefore inferred as the result of an ad-equate water-rock reaction and the participation of deep-sourced fluids .It is preliminarily inferred that the Tertiary in Nanyishan area of the basin may be a potential target for exploration of potassium .