NA-CA-CL SALINE FORMATION WATERS, FRIO FORMATION (OLIGOCENE), SOUTH TEXAS, USA - PRODUCTS OF DIAGENESIS
NA-CA-CL SALINE FORMATION WATERS, FRIO FORMATION (OLIGOCENE), SOUTH TEXAS, USA - PRODUCTS OF DIAGENESIS
复制标题
DOI：
10.1016/0016-7037(95)00098-k
复制
发表时间：
1995-06-01
影响因子：
5
通讯作者：
LAND, LS
中科院分区：
文献类型：
--
作者：
LAND, LS
来自德克萨斯州南部渐新世三角洲碎屑沉积岩(Frio组)储层的含盐地层水来自三个来源。混合物是大多数样品的特征，在化学上占有很大的范围。低盐度水来源于新生代页岩。相反，具有不同溴/氯比值的咸水是外来的，至少来自新生代单元之下的中生代地层中的两个来源。这一地区的咸水，无论溴/氯比如何，都含有可变的高浓度钙。正如岩相学、锶-87/锶-86分析和化学模拟所证明的那样，钙主要来自斜长石的溶解。因此，该地区含盐地层水的MeCl(2)或Carpenter函数可以从水-岩相互作用中得到，而不能用来识别最终的溶质来源。反渗透作用在该地区是一个不重要的过程，增量(18)O和增量D值分别收敛于岩石缓冲值约为+8ppm和-30ppm。
Saline formation waters from reservoirs in Oligocene deltaic elastic sedimentary rocks (Frio Formation), south Texas, are derived from three sources. Mixtures characterize most samples, accounting for the wide range in chemistry. Low salinity water is derived from Cenozoic shales. Tn contrast, saline water having variable Br/Cl ratios is allochthonous, and is derived from at least two sources in Mesozoic strata which underly the Cenozoic units. Saline water in this area, regardless of Br/Cl ratio, contains variable, high concentrations of Ca. Calcium is derived primarily from dissolution of plagioclase, as demonstrated by petrography, Sr-87/Sr-86 analyses, and chemical modelling. The MeCl(2) or Carpenter function of saline formation waters in this area thus can be derived from water-rock interaction, and cannot be used to identify the ultimate source of solutes. Reverse osmosis is an unimportant processes in this area, and delta(18)O and delta D values converge on rock-buffered values of approximately +8 parts per thousand and -30 parts per thousand, respectively.