济阳坳陷油田卤水溶解金属元素的初步实验研究  

Preliminary Experimental Study on Dissolution of Metal Elements in Oil Field Brine of Jiyang Depression, Shandong Province

作　　者：曹辉兰[1] 华仁民[1] 饶冰[1] 裘丽雯[1] 

机构地区：[1]南京大学地球科学系内生金属矿床成矿作用研究国家重点实验室

出　　处：《地质论评》2002年第4期444-448,共5页Geological Review

基　　金：国家自然科学基金项目(编号49572108)资助成果。

摘　　要：本文用模拟实验方法研究了不同水型的油田卤水在低温(40～150℃)条件下对金、银等金属元素的溶解和迁移作用,以及不同络阴离子对金属元素溶解迁移的贡献。结果表明,油田卤水促进了含油气盆地中Au、Ag、Pb、Zn元素的淋滤、溶解和迁移,起到了成矿流体的作用,从而积极参与了沉积改造型矿床的成矿作用。CaCl_2型油田卤水易溶解Pb、Zn,而NaHCO_3型油田卤水溶解Au、Ag的能力较强;在油田卤水中HS^-及SO_4^(2-)离子对Au、Ag元素的络合能力强,而乙酸根离子及HS^-(或S^(2-))易络合Pb、Zn元素。Taking oil field brine as ore-forming solution, this paper deals mainly with (1) the dissolving and transporting effects of gold, silver, lead and zinc in oil field brines of different chemical water types at low temperatures from 40 to 80℃, at normal pressure, and at 150℃, at pressure determined by the liquid-vapor pressure of the solution; (2) the influences of complex anions on dissolution and transport of metal elements. It is concluded that oil field brines can be effective carriers of metal elements and can effectively enhance the leaching, dissolving and transporting effects of gold, silver, lead and zinc in an oil- and gas-bearing basin and can attend actively ore deposition of sedimentary-reworked deposits. It is illustrated that oilfield brines of bicarbonate-sodium type is more effective for dissolving gold and silver, however, oilfield water of chloride-calcium type is more effective for dissolving and transporting lead and zinc. At the same time it is elaborated that gold and silver is probably dissolved and transported in ore solution at low temperatures as thio complexes, nevertheless lead and zinc tend to be transported by complexes with ions of CH3COO- and HS- (or S2-).

关 键 词：实验地球化学 成矿流体 迁移 水型 济阳坳陷 油田 卤水 溶解 金属元素 

分 类 号：P59[天文地球—地球化学]