Quaternary geology and hydrogeology of Amphoe Khu Muang, Changwat Buriram

Abstract

This investigation of the quaternary geology and hydrogeology purposes are to explain the subsurface geology, groundwater modeling, and the environment of deposition of Amphoe Khu Muang, Changwat Buri Ram. The data of cuttings, E-logs and groundwater quality data of the groundwater well, that distributed in the area, are used in the investigation. The Quaternary geology of Amphoe Khu Muang, Changwat Buri Ram can be divided to 2 formation by the sedimentary and E-logs character. The formation A is red clay which is the basement of the investigated area. The other is formation B which is an alternation of sand and clay. It can be divided this formation into 5 members as BM, BN, BO, BP, and BQ by the differentiation of colors and sedimentary character. These members are fluvialtile lacustrine deposits. The typical character is the finning upward sequence in BM, BO, and BQ member. The hydrogeology can be classified the BM and BO member as aquifers. The formation A, BN, and BP members are aquitard. The both aquifers are confined by member BP. The piezometric level is about 150 meters above mean sea level. The artesian flowing well phenomena appeared sacredly throughout the investigate area especially in the northern part. For the southern part, no artesian flowing well phenomena found. In the lower aquifer of the northern artesian flowing well phenomena, the brackish water is detected. The brackish water is dispersed from the lens of rock salt in the formation A and transgresses to the member BM.