The Saq aquifer is the largest most

The Saq aquifer is the largest most productive and most developed
aquifer in the study area. Generally, it has a very large areal extension from
the Jordanian border as far south as latitude 24° 30' N and longitude 45° E,
with a surface area of about 6500 km2 (Jerais, 1986).
The thickness of this aquifer is variable but it changes according to
geologic formations. It ranges from 200 m to 500 m in south and east of
the study area, while in the northern part it ranges between 150 m and 500
m. However, in the central part of the area, its thickness varies between 450
m to 600 m (Tabuk Agricultural Development Company, personal
communications).
The Saq Formation rests directly on the crystalline rocks of the
Precambrian basement, and overlain by the lower part of the Qassim
Formation. The effective porosity of this aquifer generally exceeds 15%
with a range of 10 – 20% ( King Fahd University Staff, 1987) The isotopic
age of groundwater of the Saq aquifer varies between 22,000 and 28,000
before present, which indicates fossil water features (Edgell, 1997)

Results (English) 3:

SAQ含水层是最大的最有效和最发达的
在研究区含水层。一般来说，它已经从
约旦边境南到北纬24°30’东经45°E非常大面积的扩展，
与表面面积约6500平方公里（jerais，1986）。
这个含水层的厚度是可变的，它根据地层变化
。它的范围从200米到
研究区南部和东500米，而在北部范围150 m和500 m之间
然而，在中部地区，其厚度变化在450
米至600米（塔布克农业开发公司、个人

通信）。SAQ的形成在于直接对
前寒武纪基底结晶岩，与上覆的卡西姆
组下部。这个蓄水层的有效孔隙度一般超过15%
一系列20%（10–法赫德国王大学职员，1987）对SAQ含水层地下水同位素
年龄的变化22000和28000
前之间，这表明化石水特征（Edgell，1997）