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Society of Petroleum Geophysicists (SPG) & Association of Petroleum Geologists (APG), Vadodara Chapter organised a technical meet on 22nd November 2019. The programme started with two thought-provoking, interactive talks on contemporary issues.
The first one was delivered by Shri Jeetendra Tiku, General Manager (Geophysics) on the topic namely "Introduction to Policies governing Oil & Gas industry in India with special reference to Open Acreage Licensing Policies (OALP)". It was followed by another enlightening talk on the topic "Introduction of new technologies in Geophysical Services".
During his presentation, Mr. Jeetendra Tiku elucidated the various complexities pertaining to Important Acts & Rules Governing Hydrocarbon Exploration & Oilfield Development. He explained about Open Acreage Licensing Policy under Upstream Policy Regimes in India.
Shri Praveen Vohat presented an overview of Low frequency Passive Seismics. He also explained the acquisition gamut of LFPS including brief description about new LFPS Seismometer and also about the capability of new data acquisition system 508 XT.
All the SPG and APG members of WON Basin actively participated and benefited from the technical lectures. GGM - Basin Manager Shri H Madhavan in his address explained about the importance of such technical lectures and encouraged to conduct this type of program very often which will help enhancement of knowledge in earth science. The fraternities took this opportunity to bid farewell to Shri Matibar Singh, GGM-HGS, President, SPG, Vadodara Chapter.
The technical lecures were followed by colourful cultural programme and dinner.
In the evening, the members enjoyed a mesmerizing cultural programme, presented by an eminent dance troupe arranged from outside.
This was followed by an interactive sumptuous dinner. The technical programme was compared nicely by Ms Kanika, Programming Officer and Ms Nisha, Geophysicist (S). Vice President SPG Shri Rajesh Madan, Vice President APG Dr. A. K. Singh, Treasurer SPG Shri Rajesh Upadhyay and Secretary APG Shri Bhupendra Tauk were instrumental in making the event successful. The vote of thanks was proposed by Mr. Sanjay Kumar, Secretary, SPG, Vadodara Chapter.
The Earth Study 360 Imaging System 'An Insight into the Interpretation Realm' by Dr.Raanan Dafni, Emerson-Paradigm
Mumbai Chapter of Society of Petroleum Geophysicist (SPG) had organized a technical presentation on, The Earth Study 360 Imaging System “An Insight into the Interpretation Realm” by Dr. Raanan Dafni, Emerson-Paradigm on 7th Nov 2019, at NBP Green Heights, ONGC, BKC, Mumbai. In his interactive and well appreciated presentation, Dr. Raanan highlighted the (a) overview of ES360 Imaging System, (b) benefits of full-azimuth angle-domain imaging, (c) case studies from both Indian and global data and (d) pre-stack interpretative engine, i.e. supplementary information from directional image gathers.
The EarthStudy 360 Imager (ES360 Imager) is a versatile cluster-based depthmigration that simultaneously uses the full recorded wave field within acontrolled aperture to generate amplitude preserved, multi-dimensional, subsurface angle gathers which are 3D full azimuth, directional and reflection angle gathers. The Imager provides fast, target-oriented solutions for local analysis, and can also be used for imaging ona regional scale.It supports isotropic and anisotropic models, and all types of land and marine datasets, including narrow and wide azimuth streamer acquisitions and OBC data. Recently, ES360 migration included converted rays (P to S) also.
Unlike conventional ray-based imaging methods (e.g. Kirchhoff migration), EarthStudy 360 uses a point-diffractor operator to shoot rays from subsurface grid points up towards the surface, forming an accurate system for mapping the recorded surface seismic data into the subsurface Local Angle Domain (LAD) at each image point. This procedure ensures maximum illumination of the image points from all subsurface directions and surface source-receiver locations; all arrivals are taken into account and amplitudes and phases are preserved.
Earth Study 360 directional angle gathers enable specular and diffractionimaging, resulting in simultaneous emphasis on continuous structural surfacesand discontinuous objects such as faults or small-scale fractures, karst features. Structuralattributes at each subsurface image point (e.g. dip, azimuth and specularity)can be derived directly from the directional angle gathers.The ES360 directional angle gathers from Narrow azimuth surveys are suitable for diffraction imaging of discontinuities like faults and fractures as they are directly related to migration aperture and not sensitive to acquisition geometry unlike the reflection angle gathers. The diffraction imaging results are a better way of delineating the discontinuities than traditional ways like coherence cube.
Earth Study 360 reflection angle gathers display reflectivity as a function ofopening angle and opening azimuth and are most meaningful in the vicinity ofactual local reflecting surfaces, where the reflection angles are measured withrespect to the derived background specular direction. They are used forautomatic picking of full-azimuth, angle domain residual moveouts, which together with the derived background orientations of the subsurfacereflection horizons, provide a complete set of data for anisotropic velocity modeldetermination, azimuthally-dependent analysis of residual velocity (VVAZ) or amplitude versus angle/azimuth (AVAZ), using full azimuth angle domain seismic data, in order to determine fractureintensity (strength) and orientation (direction). These fractures derived from the seismic were verified with production data, FMI logs and available micro-seismics.
Regarding the future roadmap of ES360,Dr. Raanan demonstrated the applicability of Deep Learning (DL) to automatically obtaining different types of high resolution subsurface geometrical objects. The Deep Learning method is applied to spatial windows of overlapping full-azimuth directional image gathers. The application of Principle Component Analysis (PCA) on covariance matrices applied to these data windows significantly reduces the data, where only the principle (informative) directivity components are considered. The back propagation of these classified principle components to the image domain shows clear differentiation between structural reflectors, faults and point diffractors, even in areas heavily masked by ambient and coherent noise such as acquisition footprints. This approach shows great promise in identifying subsurface structural features with high accuracy which would be highly beneficial to the interpreters.
Mr. SK Sharma, (GGM-GP), HGS-Mumbai felicitated Dr. Raanan for his fantastic presentation. Mr. CPS Rana, (GGM-GP), Vice-President, SPG, Mumbai Chapter sum up the whole presentation, mentioning the international recognition of activities of SPIC, WOB on ES360 imaging system. Enthusiastic interpreters had made a valuable interaction with Dr. Raanan about the pre-stack interpretative engine of ES360.
SPG Mumbai organised a technical session titled “Imaging and Reservoir Technology Update”on 11th October 2019 at Auditorium, NBP Green Heights, Mumbai.The session is a part of continuous and relentless efforts by SPG to share ideas and experiences to the geo-scientific community and to express & exchange views & opinions on various exploration problems in Mumbai offshore areas. The session was chaired by SPG Mumbai Chapter President Shri K V Krishnan.
APG Mumbai Chapter Vice President Shri K. Vasudevan, SPG Mumbai Chapter Office bearers, Geoscientists from different G&G Companies and Students from Colleges were also present.
SPG Mumbai Chapter, President, Shri K V Krishnan emphasised the need of goodseismic imaging in exploration. He also made a point that with the advent of new technology and algorithm advancement, we should focus on robust processing sequence to bring out the difficult Mesozoic gas of Kutch Offshore.
SPG Mumbai Chapter,Secretary, Shri Anupam Sharma briefed on the 13th Biennial International Conference & Exposition scheduled to be held at Lulu Bolgatty International Convention Centre (LBICC), Kochi, Kerala, India from 23rd to 25th February 2020.
APG Mumbai Chapter Vice President Shri K. Vasudevan elaborated the exploration challenges in Western Offshore. He also said that successes in Mesozoic sandstone and Fractured /Weathered Dolerite (Intrusive) of Kutch Offshore need to be studied in detailed. The impact of processing,better imaging and reservoir technology advancement will certainly help in better understanding of these type of reservoirs.
Processing-Imaging Technology Update- By QING XU Joint 3D Source Deghost and Designature,OBN Deblending, Demultiple,IMA,ISS, FWI, Least Square Q Migration. Processing methodology was detailed with recent advancements and with case studies.
G&G Studies (Robertson UK)- By MARK COWGILL Integrated G&G Studies from Exploration to Development & Production, Unconventional Experience and Workflows and Geotraining. The presentation highlighted the approach to digitisation and digitalisation of existing data sets, play fairway mapping, improved seismic imaging and reservoir characterization.
Qing Xu is currently the VP Geoscience, Asia Pacific, Robert Porjesz , Regional Manager, Asia Pacific and Mark Cowgill, Business Development Manager for CGG Geoscience.
SPG Mumbai Chapter, Vice President Shri C P S Rana concluded the technical session with vote of thanks.He said that focus to imbibe recent advancements in processing and world analogue vis a vis Western Offshore Basin, India should be our focus area to work upon.
SPG Mumbai organised a technical session titled “Imaging and Reservoir Technology Update”on 11th October 2019 at Auditorium, NBP Green Heights, Mumbai.The session is a part of continuous and relentless efforts by SPG to share ideas and experiences to the geo-scientific community and to express & exchange views & opinions on various exploration problems in Mumbai offshore areas. The session was chaired by SPG Mumbai Chapter President Shri K V Krishnan.
Session started with welcome address and brief introduction about the objective of the program by President SPG India, Jorhat chapter Shri Vishal Shastri, GGM (GP). He said that such interactive sessions are noble initiatives and give an opportunity, especially to young executives, for Knowledge Sharing. He also detailed future programmes planned under the aegis of SPG-India, Jorhat Chapter that included more lectures and Geophysical & Geological field trips. Shri USD Pandey delivered his talk about ‘Emerging Geophysical Technologies for Hydrocarbon Prospecting’. The participative interaction by the house made the talk fruitful and interesting.
Shri Vijay Kumar Gokhale, CGM (Production), Asset Manager gave concluding remarks and emphasised the need of induction of new technologies to arrest the declining production and finding of new oil for sustenance of the production. The meeting concluded with vote of thanks by Shri H N Garg, Vice president, SPG-India, Jorhat chapter.
SPG Ahmedabad Chapter organized a technical lecture on
“Basins, Their Structural Style and Play Fairways”
SPG-Ahmedabad Chapter organized a technical lecture on July 23rd 2019 on the topic “Basins, Their Structural Style and Play Fairways”. The lecture was delivered byProf.Jokhan Ram,former ED-Chief KDMIPE, ONGC and presently occupying the K.D Malviya Chair at Banaras HinduUniversity.
At the start, SPG Ahmedabad Chapter welcomed the distinguished speaker. The scholarly lecture dwelt at length the finer aspects of the subject on structure and tectonics, depositional systems, basin analysis and prospect evaluation.
The speaker covered all the aspects right from formation of different types of basins, various structural styles and its interpretation making use of the geological and geophysical data with example from Indian as well as Basins from across the globe. In the end play fairways were discussed with example form various fields. The event wasattended by large number of SPG members.It was a lively interactive session and was very well received by the audience.
SPG Ahmedabad chapter took pride in conducting such lecture series at regular intervals and looks forward for many more such knowledge sharing events in future.