河南省泌阳凹陷安棚地区古近系核桃园组含碱地层层序特征及其意义

发布时间：2018-05-12 18:50

本文选题：泌阳凹陷 + 安棚地区　；参考：《古地理学报》2016年01期

【摘要】：泌阳凹陷位于南襄盆地东南缘,为一西北浅、东南深的陆相断陷型盆地,其沉降中心安棚地区古近纪发育巨厚的白云岩地层,主要天然碱矿层赋存于核桃园组核三段上部和核二段下部,并与白云岩地层密切相关。基于岩心、录井与地震等资料,该区古近系核桃园组含碱岩系地层划分为3个二级旋回,进一步划分为8个三级旋回。所含天然碱矿层位于基本层序顶部、二级或三级旋回的上部,含碱岩系地层层序由(纹层状)白云岩到天然碱矿层规律性变化。根据天然碱矿层垂向变化规律进行找矿预测和钻探中预判矿层位置,已经取得较好效果。同时根据该区盐类矿产沉积旋回的研究,一级旋回顶部有钾盐的显示,预示该区有寻找钾盐的可能。
[Abstract]:Biyang sag is located in the southeastern margin of Nanxiang basin. It is a continental faulted basin with shallow northwest and deep southeast. The Paleogene dolomite strata developed in Anpeng area, its subsidence center, are very thick. The main natural alkali deposits are located in the upper part of the third member of the nucleus and the lower part of the second member of the nucleus of the HuiTaoyuan formation, and are closely related to the dolomite strata. Based on the core, logging and seismic data, the alkali-bearing strata of the Paleogene Hedaoyuan formation are divided into three second-order cycles and eight third-order cycles. The alkali-bearing strata are located at the top of the basic sequence and the upper part of the secondary or third-order cycles. The sequence of the alkali-bearing rock series changes regularly from dolomite (laminated) to the natural alkali ore bed. According to the vertical variation law of the natural alkali ore bed, the prospecting prediction and the prediction of the ore-bed location in drilling have achieved good results. At the same time, according to the study of sedimentary cycles of salt minerals in this area, there is a display of potash salt at the top of the first-order cycle, which indicates the possibility of looking for potash salt in this area.
【作者单位】：河南省地质矿产勘查开发局第一地质勘查院;
【分类号】：P619.211;P539.2

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