摘要
安棚碱矿位于泌阳凹陷东南部,碱矿层主要赋存于古近系核桃园组核一段的上部和核二段中、下部,碱矿层主要由重碳钠盐(NaHCO3)和碳氢钠石(Na2CO3.3NaHCO3)组成,碱矿层顶、底板主为白云岩。碱矿层系由淡化湖泊逐渐浓缩咸化,从碱性卤水中沉积而成。根据碱矿层在地球物理测井资料中有明显显示的特点,利用多种地球物理测井资料建立岩性与电性关系、碱矿层与测井曲线的关系,制定出判断岩性、碱层和划分碱层厚度的电性界限及夹层剔除的电性界限,进而确定了碱矿层位置和厚度,弥补了钻探取心较少的缺陷;根据测井数据确定的矿层厚度与取心的见矿厚度基本吻合,误差很小;通过钻探取心和测井资料综合分析,在安棚碱矿共发现天然碱矿层17层,矿床具大型规模。
Anpeng trona deposit is located in the southeast of Biyang depression with the ore layers occurring at upper part of the 1st member and middle and lower parts of the 2nd member of Hetaoyuan formation of Palaeogene System. The ore is mainly composed of sodium bicarbonate （NaHCO3） and wegscheiderite （Na2CO3 · 3NaHCO3）. The foot and top wall rocks are mainly dolomite. The trona layer is formed by its precipitation from alkaline saline of the freshened lake due to salinization and gradual con- centration of the alkaline materials. According to sharp display of the trona layer during the geophysical well logging relation between the lithology and electric property and between the trona layer and logging curve is determined on basis of various grophysical well logging data,Then the electric property limits for demarking lithology, trona layer and the thickness and the waste interlayer for rejecting is drawn up so as to locate position of trona and determine the thickness and remedy the lower core recovery of drilling. The trona layer thickness determined by geophysical well logging data is coincided roughly with that of drill core and the error is rather small. Comprehensive data analysis of drill core and geophysical well logging data show that there are in all 17 trona layers in Anpeng trona deposit and the deposit is a large trona deposit.
出处
《地质找矿论丛》
CAS
CSCD
2010年第3期252-259,共8页
Contributions to Geology and Mineral Resources Research
关键词
安棚天然碱矿
泌阳凹陷
核桃园组
地球物理测井
河南省
Anpeng trona deposit
Biyang depression
Hetaoyuan formation
geophysical well-logging, Henan province
