SPG Jorhat chapter has been striving to bring the Geoscientists on a common platform for sharing their experience, ideas and knowledge in petroleum exploration to address the ever evolving challenges. An In-field Workshop was organized as part of these SPG endeavours for exposing Geoscientists from various upstream disciplines to real time Seismic data acquisition.
This workshop, organised in association with A&AA Basin comprised of one day spent in a Geophysical field party involved in Wide Azimuth (WAZ) 3D Seismic data acquisition on 27.02.2022 in Charali-Changmaigaon-Nazira area in which a total of 50 geo-scientists and other allied professionals at all levels, right from fresh GTs to Block Managers, participated in the event.
Fig 1: Flag-off by ED-Basin Manager
Ms. Sushma Rawat ED-BM & Patron SPG Jorhat Chapter, while flagging off the field trip to in-field workshop highlighted the importance of quality seismic data in oil exploration industry and need to respect the data and appreciate the immense efforts behind its acquisition.
Anenthused team of participants, along with Deepak Sareen, HGS, GPS and Sh. R K singh, I/c Ops left Luit Bhavan, Cinnamara for field camp at Mezenga in early Morning where Party Chief GP-23, Sh. Rajiv Mahanta welcomed the participants and a breakfast was served. After a safety briefing and ONGC song there was an extensive technical session addressing seismic data acquisition design and in-field practices by Sh. Akash Chandra, member of GP23. Many audio-visual depictions of field work were presented. This was followed by a much contested Quiz Competition conducted by Sh. RBN Singh, I/c Logging services and Sh. K V Mithun, SG(S), on geosciences wherein winners were presented with spot prizes.
Fig2: Technical Presentation Session
Fig2: Technical Presentation Session
A demonstration of actual ground electronics was made by laying out a small scale multi-line telemetry seismic spread in camp grounds; complete with Geophones, cables, station units, line testers, GPS equipment and seismograph. This helped participants realize the ground realities of a seismic survey before actual visit to the field in the afternoon session. A set of poster presentations helped explain the finer points of seismic data acquisition in considerable detail.
Fig3: Quiz participants and Winners
Fig3: Quiz participants and Winners
Participants showed great interest in upcoming state of art Nodal seismic system displayed in this exposition and marvelled at the large scale simplification of logistics by this technology that is getting inducted in ONGC for the first time in GPS, Jorhat in March 2022.
After this very engrossing fore-noon session a sumptuous outdoor lunch was served which was made memorable by a very pleasant weather. It was then time to leave for field where by this time shooting had already begun after troubleshooting of field spread.
Fig 4: Demonstration of Ground Electronics (Top), Poster Session& Departure to Field (Bottom Left & Right respectively)
The convoy of participants was taken firstly to the shot-hole loading and shooting location and after some much-appreciated leg work reached the shot line location. The whole process of depth verification, charge priming and loading was demonstrated. The participants with maiden visit to field were literally thrilled by feeling the vibrations of the earth while blasting the shot holes.
Subsequently, all the members proceeded to the instrument where, in small batches of participants were taken inside recording truck where they witnessed the real-time shot control and data recording with real time visualization of data and different types of noises.
Fig5:Learning the Field activities (Top & Bottom Left),Shot-hole Blasting (Right)
The event concluded upon arrival back at Jorhat with a valedictory function and vote of thanks by Sh. Ambrish Tripathi, CG (S) Secretary SPG Jorhat Chapter.
This memorable event could be organised only because of encouragement and support of SPG India President Sh. S K Sharma ED-CGS, Patron SPG Jorhat chapter Ms. Sushma Rawat, ED-BM and meticulous planning and execution by all the members of SPG Jorhat executive body especially President Sh. Deepak Sareen, CGM(GP),Vice-President Sh. RBN Singh, GM(W), Advisor Sh. N .M Dutta, GM(GP), Secretary Sh. Ambrish Tripathi CG(S), Treasure Sh. Mrinmoy Sharma, SG(S), Joint Secretary Sh. Ankur Ahmed, SG(S) and executive members Sh. KV Mithun SG(S) & Sh. Manas Pratim Gogoi, Geophy (S).
Society of Petroleum Geophysicists (SPG)-India organized a technical webinar on 20.01.2022 at Dehradun on the topic on “Shale Gas and Oil Resource Potential of India and Comparison with Major US Plays”. The webinar was delivered by Shri Arun Kumar, Ex-Executive Director of ONGC. Around 170 professionals from ONGC, Academic / Research institutes and various E&P companies have participated enthusiastically.
Session started with welcome address and brief introduction about the objective of the webinar by President of SPG India, Shri S K Sharma,ED-CGS. While introducing the topic President, SPG said that the shale oil & gas exploration is a game changer in the HC production history of The USA, which turned from net importer to self-reliant and tending towards net exporter. President, SPG-India emphasized that such interactive sessions are noble initiatives which give an opportunity for knowledge sharing and interaction with young and experienced geoscientists.
Shri Arun Kumar delivered the talk on ‘Shale Gas and Oil Resource Potential' of India and Comparison with Major US Plays. The talk highlighted the fact that in India, due to the huge gap between energy supply and demand, the conventional oil resources are not enough to fulfill the energy requirements. Due to high oil price fluctuation, the need for unconventional hydrocarbon resources is increasingly high for energy security. Among the unconventional resources that are trapped in tight reservoirs and sedimentary rocks, shale gas is one of them. For the exploitation of conventional gas, vertical drilling is the only process where natural gases rises from the reservoirs naturally due to the pressure difference. But in case of shale gas, vertical drilling collects only a marginal quantity of gas, which deeply hampers the profitability of shale gas exploitation. Various techniques like horizontal drilling, hydraulic fracturing have made the shale gas exploration and exploitation extremely economical which has been successfully implemented in developed countries like USA, Canada and China. Currently for enhanced shale gas recovery, methods like CO2 Injection and Enhanced CH4 Recovery and High Temperature Supercritical CO2 Flooding, are under active research.
Shri Arun Kumar talks about the India high potential reserves of shale gas in Cambay basin, Assam-Arakon basin, Krishna-Godavari basin, Cauvery basin and Damodar valley sub-basin. Shale gas tends to cost more than gas from conventional wells due to extensive use of horizontal drilling and high-volume hydraulic fracturing. Due to such parameters, India has not been able to commercialize the production. Currently India is facing challenges for the production of shale gas due to limited geographical area and requirement of huge water reservoirs as compared to other shale gas producing countries. Apart from that, priority attention needs to be given to the technological development, man power, infrastructure, policy and regulatory framework. The talk reviews the current scenario and potential of shale gas in Indiaand also focuses on the upcoming challenges and their proposed solutions for the production of shale gas in India, which is going to be a huge source of unconventional energy in upcoming decades.
The participative interaction with various questions related to shale gas prospective by the participants made the talk fruitful and interesting. The talk was well appreciated by all the participants for its contents and thoughtful discussion provided by the presenter. The entire webinar session was coordinated by Shri Shashwat Shubhra, Executive Member, SPG-India.
It was a proud moment for Society of Petroleum Geophysicists (SPG), India to organize a geological excursion from Sub-Himalaya to Lesser Himalaya in Dehradun-Mussoorie-Dhanaulti Sector (Garhwal-Himalaya) on 27th November 2021.
Geologically the Himalayan mountain chain has been divided into four longitudinal lithotectonic zones. From South to North these zones are as follows: Outer Himalayan Zone or the Himalayan Foothills that comprises mainly the Molasse sediments, the Lesser Himalayan zone comprising low grade metamorphic rocks, the Higher Himalayan Crystalline complex which includes high-grade metamorphic rock and the Tethyan Himalayan sedimentary sequence that encompasses Proterozoic, Palaeozoic and Mesozoic sequences. These zones are longitudinally oriented in West-East direction and extend from Nanga Parbat to Arunachal Pradesh.
A team of 52 geoscientists led by Shri. Vishal Shastri, ED-HoI GEOPIC & vice president SPG, India along with Shri. S. N Chitnis, ED-HoI, KDMIPE & President APG, India, Shri R Tandon GGM-BM, Frontier Basinsand executives from E&D Directorate, GEOPIC, KDMIPE and Frontier Basins, Dehradun participated in the geological excursion. Dr. R Islam, Scientist G (Retd.), Wadia Institute of Himalayan Geology (WIHG), with more than thirty years of vast experience in Himalaya, accompanied the team as an expert to the field.Shri A CNaithani, GGM (Retd.), ONGC also joined the team as co-faculty for the trip. The team assembled at KDMIPE Campus (in front of SPG office) in the early morning of 27th November, 2021 and started their journey to Shahanshai Ashram– Pathanghat – Kolukhet toll checkpost – Jharipani – Bhatta- Barlowganj-Dhanaulti route. The focus of the field trip was to familiarize with different geological sequences from Sub-Himalayan to Lesser Himalayan terrains.
During the field familiarization, participants were taken on a guided traverse through the frontal part of the Himalayan Fold Thrust Belt, in the neighbourhood of the Doon Recess. The objective of the day-long program was to introduce them to the geology of the Great Himalaya, which has fascinated earth scientists of all generations. Starting with the regional perspectives including geographical and stratigraphic aspects, the process was endeavour to introduce structural and tectonic aspects of the study area, covering the frontal lithotectonic zones - the Sub Himalaya and the Lesser Himalaya.Brief descriptions of the covered stoppages are provided below:
First stop is located near the mule track from Shahanshahi Ashram to Jharipani. Here, contact between Siwalik and Lesser Himalaya was observed which demarcate the Main Boundary Thrust (MBT). The Main Boundary Thrust (MBT) is one of the most important tectonic elements of the Himalaya which acts as the boundary between the Sub Himalaya and the Lesser Himalaya. At this stoppage, the different aspects of the MBT and its importance in Himalayan geology were discussed. Also various aspects of Sub-Himalaya and Lesser Himalaya were discussed after familiarization of strati-structural aspects of the study area. The Lesser Himalayan Units viz. ChandpurPhyllite and Nagthat Quartzite were seen along the Shikhar Fall Road section.
Second stop is located at about a distance of 2km from toll barrier at Pathanghat. Contact relationship between Nagthat quartzite and Blainidiamictite were observed in this area. At the contact of Blaini, pyrite bearing and glauconitic quartzite are present. Quartzites are of white in colour in this region. The mixed type of facies (interbedded quartzite, siltstone, rarely shale) indicate they have been deposited in a mixed to sandy tidal flat environment.
Third stop is located 2.7 km from Toll barrier, at the bridge over a nala at Pathanghat. Conglomerate- quartzite-siltstone of the Blaini formation was observed here. Different varieties of conglomerate associated with quartzite, siltstone and shale are present in this area. Both clast supported and matrix supported conglomerate were seen. Clast supported conglomerate contains fragments of limestone, quartzite, siltstone, sandstone, jasper etc. Most of the clasts are similar in lithology to the underlying Nagthat and Chandpur formations.
Fourth stop is located at Kolukhet toll checkpost. In this area, a transitional passage from Infra-Krol to lower Krol were observed. Infra Krol sequence represented by dark grey to black coloured thinly bedded laminated argillites with inter-bedded siltstone and sand stone. Carbonaceous shale were seen. It is transitionally succeeded by a sequence of interbedded calcareous shale, marl and grey fine limestone.
Fifth, sixth and seventh stops are located near abandoned Toll barrier at Jharipani, near Bhattaand near Barlowganj suspension bridge respectively. In the fifth stop, Krol-B, and Krol C Formation were observed. Very high quality limestone, massive gypsum, calcite pockets and oolites are commonly found in this area. In the sixth stop, Krol C, limestones with stromatolitic algal mats and oolites were observed. In the seventh stop, Krol-D limestone with algal mats was observed. Cynobacteria was also observed in this study area.
Finally, a visit to the geologically important outcrop where the Precambrian-Cambrian boundary viz. “from where life begins” had been demarcated. This stop is located at Mussoorie- Tehri by pass road. Approximately 3.5 km from Dehradun –Mussoorie diversion. This road takes off to the east from Dehradun-Mussoorie road, 200 meters before Kingkraig. At this spot, contact between upper Krol and Chert –Phosphatic rocks of lower Tal are exposed. This spot is part of Mussoorie syncline.Second order tight recumbent folds and fault plane are also observed in this area.
The daylong field trip proved to be very educative to all the participants , it gave an insight on the exposures and geology of the sub-Himalaya and lesser Himalaya coupled with the enrichment on the spot with the vast experience of Dr. R Islam and Shri A C Naithani. The geological field trip had been very inspiring for the geoscientists in understanding the Himalayan Geology and structural complexity present therein.
Flag off ceremonyby Shri. Vishal Shastri, Vice President SPG at KDMIPE and journey started to field on 27.11.2021.
Shri. Vishal Shastri, ED-HoI, GEOPIC & Vice President SPG, Shri. S N Chitnis, ED-HoI, KDMIPE & Shri AC Naithani observing Krol formation near Toll barrier
Team observing the MBT (Siwalik and Lesser Himalayan Boundary) near Shahanshai Ashram.
Team assembled near Cambrian-Precambrian Boundary at the onset of Tal formation near Mussoorie- Tehri by pass road.
Faculty Dr. R Islam explaining about the Lesser Himalayan tectonics and geology.
Shri. Vishal Shastri, ED-HoI, GEOPIC & Vice President SPG felicitating faculty Dr. R Islam.
Contact between Siwalik and Lesser Himalayan Formation is inferred by the difference in elevation which demarcate the Main Boundary Thrust (MBT).
Krol-B member observed near Jharipani. Very high quality limestone, Massive gypsum, calcitepockets and oolites are commonly found here.
Krol A formation observed near Kolukhet Toll checkpost. Shows intercalation of Limestones and Shale.
Cambrian-Precambrian Boundary at the onset of Tal formation near Mussoorie- Tehri by pass road. Intercalated Chart and Limestone are found here.
SPG Ahmedabad chapter organized a trip to Geophysical field party GP-16 camping at Valod area, Gandhinagar on 16th Mar'20.
SPG and APG Vadodara chapter organised a geological field trip to Narmada North, Kevadiya, on 1st February, 2020.
Society of Petroleum Geophysicists - India, Jorhat Chapter organized a guest lecture on 26.11.2019 at ONGC, Jorhat on the topic "Shale Oil & Gas