In order to determine the distribution of the basalt, both horizontally and vertically, core samples were collected from preliminary geotechnical boreholes drilled by the General Directorate of the State Hydraulic Works (DSI), and the depth to groundwater was measured in these boreholes.
All samples from the WFSD-1 borehole underwent preliminary study in the WFSD field laboratory shortly after drilling.
This paper presents a method of predicting borehole stability while drilling preliminary prospecting wells and establishes a nonlinear model including wave impedance and borehole stability mechanical parameters by investigating the quantitative relationships between wave impedance and pore pressure, in-situ stress as well as rock strength.
Additionally, drilling was conducted in Bubastis in spring 2016; six boreholes were made and preliminary macroscopy sediment analyses suggest a Pre-Holocene genesis of the underlying sediments.
The second part of this preliminary analysis is the study of the borehole transfer functions using the KiK-net stations.
This short article reports a preliminary evaluation of displacement signals estimated using borehole data provided by the KiK-net (Okada et al., 2004) of the NIED National Research Institute for Earth Science and Disaster Preventionn) for the 2011 Tohoku Earthquake.
When the conventional method of predicting borehole stability is applied to the preliminary prospecting wells, the precision of prediction is often affected severely by the lack of data, limit of applying conditions, error of calculated parameters and complexity of operating courses.
Preliminary magnetic susceptibility measurement results of the WFSD-1 borehole core (but only within the fault zones) were reported by Pei et al. (2010), but results for all core samples have not yet been published.
Preliminary fieldwork comprising, geomorphological mapping, lithostratigraphic analysis of exposures and borehole drilling and laboratory testing encompassing particle size distribution analysis were carried out to broadly characterise the geology of the study area.
If preliminary tests show that one or more of the formations penetrated by a borehole will be commercially productive, the well must be prepared for the continuous production of oil or gas.
