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Low Frequency Passive Survey for Hydrocarbon Exploration (LFPS Studies)

Case studies

Geobit, October 2019

1. Introduction

GEObit-instruments supplied ONGC India, Geophysics Dept, with thirty units (30) GEOtiny20 seismometers [1] to be used for LFPS survey in the oil & gas sector. The scope of work involves supply, installation/commissioning, familiarization training and acceptance of thirty numbers of sensors with digitizer required for broadband seismic survey in different terrains including plains, hills, jungles, desert, dry area etc. Our local distributor Pan-India Consultants [2] along with GEObit engineers worked both in the office and in the field for training and installation of the thirty seismometers.

Figure 1: The GEOtiny20 seismometer

2. Familiarization with the Instruments

GEObit-Instrument’s engineers along with Pan-India Consultant’s engineers gave a five days training to ONCG people. The training was divided in three sections. During first section the operators were trained with details about instrument operation. Some demo units were deployed in the office so ONGC people were able to be familiar with instrument operation, data harvesting and data use. During second section of the training, the instruments were installed at ONGC facilities terrain simulating the field environment and during third section the instruments were installed in an oil & gas field.

Figure 2a

Familiarization with the instruments

Figure 2b

Familiarization with the instruments

Figure 3: Testing instruments installation at ONGC’s facilities

Figure 4: Testing instruments installation at ONGC’s facilities

Figure 5: Testing instruments installation at ONGC’s facilities

3. Installation in the Field

All the thirty seismometers were deployed in the field and operated in real conditions. The installation place was a production oilfield. The instruments were installed in groups over production and dry oil wells. They were let in operation for some hours and the sample data were harvested and processed by the ONGC geophysicists.

The last part of the work is the digitizer installation and testing. 

The seismic stations are getting power from a removable 12V battery. Overall power consumption is very low so the seismic station will be in operation for a very long time using only one 12V battery.

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