An overview of Indian sedimentary basins with special focus on emerging east coast deepwater frontiers

Bastia, Rabi

doi:10.1190/1.2221359

Cited by 71 publications

(32 citation statements)

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“…10a-d) depicts thick pile of Mesozoic and Tertiary sedimentary sequences. The early Cretaceous sequence represents rifted geometry where as the Tertiary sequence is characterized by occurrence of few very bright amplitude packages suggesting numerous vertically stacked sinuous deep-water channel-levee complex (Bastia, 2006). Drill well results show the sand to shale ratio within these channels is very high providing an excellent reservoir facies for petroleum accumulation.…”

Section: Krishna-godavari Basinmentioning

confidence: 98%

“…In the light of this new data set, the earlier classification of ECMI into five river based sedimentary basins (Sastri et al, 1973) has been revised on the basis of tectonic style, sedimentation and basin geometry from the shelf to deep water areas by Bastia (2006). From north to south, these are: (i) Ganga-Brahmaputra basin (Bengal offshore), (ii) Mahanadi basin, (iii) Visakhapatnam Bay Basin, (iv) Krishna-Godavari basin, (v) Palar-Pennar basin, (vi) Cauvery basin and (vii) Gulf of Mannar.…”

Section: Geological and Tectonic Features And Play Types In The Deepmentioning

confidence: 99%

“…The underlying basement in the basins is typically dominated by alternating set of NE-SW trending ridges and depressions (Sastri et al, 1981;Prabhakar and Zutshi, 1993;Fuloria, 1993;Bastia, 2006). Marine magnetic studies in the nearshore regions of the margin revealed offshore extension of structural trends and dyke intrusions related to riftphase volcanism (Murthy et al, 1993;Subrahmanyam et al, 1995Subrahmanyam et al, , 2006.…”

Section: Introductionmentioning

confidence: 96%

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Structural and tectonic interpretation of geophysical data along the Eastern Continental Margin of India with special reference to the deep water petroliferous basins

Bastia

Radhakrishna

Srinivas

et al. 2010

Journal of Asian Earth Sciences

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Section: Krishna-godavari Basinmentioning

confidence: 98%

Section: Geological and Tectonic Features And Play Types In The Deepmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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Structural and tectonic interpretation of geophysical data along the Eastern Continental Margin of India with special reference to the deep water petroliferous basins

Bastia

Radhakrishna

Srinivas

et al. 2010

Journal of Asian Earth Sciences

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“…This basin is located along a classic passive-margin setting that extends more than 200 km from the coast into the deep sea [14]. Sediment thickness in KG basin varies from 3 to 5 km in the onshore region and may exceed 8 km in the offshore region [15].…”

Section: Geological Setting Of the Study Areamentioning

confidence: 99%

Application of Post-stack migration to seismicdata associated with fault structures

Koduru

Mohanty

2015

Open Geosciences

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Abstract:In hydrocarbon exploration, wave-equation migration techniques play an important role in imaging the complex geological structures. Usually, post-stack migration scheme is applied to the seismic data to improve the resolution with restoration of dipping reflectors to their true position. As a result, the migrated time sections are interpretable in terms of subsurface features. As a numerical study, three fault models are considered for the present study. First of all, synthetic time sections are generated corresponding to three models. Later, post stack migration schemes such as Gazdag(PS), Phase-shift with turning rays and reverse time migration (T-K) domain techniques are applied in order to judge the imaging accuracy, preservation of true amplitude and computational speed. All the three post stack time migrated sections delineate the structure with their throw. However, the reverse time migrations (T-K) clearly delineate the reflectors in restoring the throw properly with minimum computational time. In order to test the validity the numerical results, similar exercise has been undertaken using field seismic data of KG basin, India. The results indicates that the field migrated sections are imaged. But, the reverse time migration (T-K ) provides the best subsurface image with restoration of reflectors and collapse of diffracted events with least computational time. Gazdag (PS) and Phase-Shift with turning migrated section shows the reduction of amplitude whereas, the reverse time migration preserved the amplitude fully.

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“…In the Krishna Godavari (K-G) Basin a detailed model of gas generation, charge focusing and migration has been developed by workers from Reliance, following the discovery of the multi Tcf-Dhirubbai Field and its satellites (Bastia 2006;Kundu et al 2008). The K-G play is believed to be biogenic based on uniformly high negative d 13 C .…”

Section: Hydrates and Biogenic Gasmentioning

confidence: 99%

Passive margins: overview

Levell

Argent

Doré³

et al. 2010

PGC

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Passive margins have been the reliable, accessible mainstay of exploration success worldwide for the last 25 years, and have hosted the spectacularly fast exploitation of deepwater resources (Angola, Nigeria, Brazil, Trinidad, USA Gulf of Mexico, Egypt, Australia and India). Despite, or perhaps because of this, there is still much to learn about the variety of hydrocarbon habitats they present.For example: (1) deep seismic observations and deep sea drilling have revealed more of the diversity of passive margins geodynamics. This liberates explorationists from simple geodynamic models, with consequences not only for new views of thermal history but also for the whole tectonic and stratigraphic evolution. For example, the time significance assigned to the geometries traditionally labelled 'pre-rift, syn-rift and sag' may be misleading. This has implications for correlations, the significance assigned to unconformities and sequence boundaries, heat flow and structural history. (2) New deep imaging of the sedimentary sections has revealed mistaken assumptions about the importance of 'mobile substrate' in major deltas and allowed the detailed unravelling of salt and shale movement and its implications for reservoir and trap. (3) Depositional models for deepwater reservoirs have increased in predictive capability and modern seismic imaging supports new models for shallow water sequences. (4) Discoveries of very large amounts of dry bacterial methane in stratigraphic traps have challenged old assumptions about prospectivity based on thermally matured source rocks. (5) New engineering and development technologies are opening up the commercialization of remote frontiers. As a consequence there is legitimate scope to re-visit old 'dogmas' and to propose that each passive margin segment is best regarded as unique, with analysis and interpretation rooted in observation rather than models (at least while the newly proposed models evolve to stability). Many of these themes were visited in the Passive Margins session of the Seventh Petroleum Geology Conference, held in London in 2009. This paper outlines some of these ideas, and considers how exploration along passive margins in the next decade can use new geoscience thinking.

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An overview of Indian sedimentary basins with special focus on emerging east coast deepwater frontiers

Cited by 71 publications

References 0 publications

Structural and tectonic interpretation of geophysical data along the Eastern Continental Margin of India with special reference to the deep water petroliferous basins

Structural and tectonic interpretation of geophysical data along the Eastern Continental Margin of India with special reference to the deep water petroliferous basins

Application of Post-stack migration to seismicdata associated with fault structures

Passive margins: overview

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