Geo-Physical Surveys Guide For A Perfect Borehole Drilling

 Before carrying out borehole drilling projects assigning a geologist with his borehole project is strongly adviced by every prospective client to consider before the drilling procedure. it is important for the client to also be aware that we have different borehole types depending on your water need and affordability.

We have industrial (deepwell) borehole and a direct shallow borehole. Each one of these borehole types is designed to serve a particular purpose(s). 

Before carrying out a drilling project, whether in the basement complex or sedimentary terrain, certain factors like underground water contaminants, depth of the fresh water aquifer, productivity of the well, septic contamination, mineralogical composition of the project site, salinity and so on, should be taken into consideration.

In this case a Geo-physical survey is highly recommended.

Geo-physical survey is simply a scientific method used in acquiring geological and hydro-geological features of the earth through some standard recommendations and adopted applications. The acquisition data helps both the client and the geologist to make a better judgement.

• Direct Shallow Borehole: 

This borehole type is the most common within Onitsha and its environment. It is the least expensive of all the borehole types, the reason why it is called shallow borehole is just because the borehole is not drilled to a far depth, it has active production sustainance and it is economically very affordable.

 In some challenging environments like; Calabar, Uyo, Port Harcourt, Anambra and other south eastern states in Nigeria. There is the possibility of saline contamination, sewage infiltration, organics, hydrogen sulphide(H2S) and run-off incursion in the shallow bed. It is therefore advised that water treatment plant be installed for safety, human health and environmental pressure.

• Industrial Or Deep Borehole: 

This type of borehole is the most reliable in terms of capacity, resistance and production to contaminants infiltration. The aquifer is confined and deep depth located. This well production possesses industrial capacity, the confine nature of the aquifer is safe from all quality interference. 

It is the most reliable of all the types of borehole listed above and it is specially designed for bottle or sachet water factories, large residence, hotels and high rise buildings, production factories, community water schemes, etc. 

The deep borehole is the most expensive of all the borehole types, because of the depth and the nature of materials involved in the drilling operations.

BASEMENT AND SEDIMENTARY REGIONS

Firstly, carrying out a geophysical survey is very important and required, its is the most important aspects of borehole drilling.

Geo-physical survey is a scientific method of acquiring geological and hydro-geological features of the earth through some standard recommendations and adopted applications.

 The acquisition data helps both the client and the borehole drillers to make a better judgement example; depth to drill, overburdened, possible aquifer etc.