High resolution sequence stratigraphy of Middle Eocene Hazad Member, Jambusar-Broach Block, Cambay Basin, India

Jaiswal, Sapana; Bhattacharya, Bishakh; Chakrabarty, Snehasis

doi:10.1016/j.marpetgeo.2018.03.001

Cited by 14 publications

(2 citation statements)

References 33 publications

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“…In the early Paleocene (early syn-rift), Olpad formation was deposited under a fluvial environment. Following subsidence and marine transgression in late Paleocene deposits, the Cambay shale is the principal source of facies (Jaiswal et al, 2018). Later in Eocene, the transgressive phase equivalent of the 'Younger Cambay shale' of the south Cambay basin deposited three hydrocarbon-bearing units known as Mandhali, Mesna, and Chhatral (members of Kadi formation) in the northern part of the Cambay basin (Figure 1B) (Padhy et al, 2016;Jaiswal et al, 2018).…”

Section: Brief Overview and Geological Setting Of The Cambay Basinmentioning

confidence: 99%

Concurrent influence of geological parameters on the integrated nano-pore structure and discretized pore families of the petroliferous Cambay shale assessed through multivariate dependence measure

et al. 2023

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Heterogeneous nanopore structure and distribution regulate the gas trapping, desorption kinetics, and diffusion in shale matrices. In shale, pores range from continuous micro- and mesopore size distributions, varying with organic (total organic matter-TOC) and inorganic constituents (clay content, Fe-bearing minerals, quartz, etc.). Previous research only showed a linear relationship of pore parameters with these intrinsic properties of shale, which limits our understanding of the concurrent influence of multiple intrinsic rock properties. As a result, in this work, we established multivariate dependency of nanopore structure, distribution, and complexity (from low-pressure N2 and CO2 sorption and small-angle scattering; SAXS/MSANS) in the previously little-studied Cambay shales and provided a better tool (partial least square regression) for analyzing the simultaneous effect of intrinsic shale properties on multiply connected pore-parameters. Furthermore, we discretized continuous pore-size distribution into individual pore families using deconvolution to understand the pore space better. Additionally, predicted shale formation environment in terms of deposition probability (P+) and dissolution probability (P−) using a dynamic model of the fractal interface by precipitation and dissolution. Our findings indicate that the Cambay shales have a high potential for future hydrocarbon exploration (S2: 2.42–12.04 mg HC/g rock), “very good” (2-4 wt.%) to “excellent” (>4 wt.%) TOC content, and thermally mature type II–III admixed and type III kerogen. Deconvolution of the micro- and mesopore size distributions reveals that pore width (w) ranges ∼15.30–35 nm occupies greater than 50% of the total pore volume, and its pore volume increases with the presence of quartz, Fe-bearing minerals, and clay content. However, pores with w∼ 3.60–15.30 nm increase exclusively with TOC. In the micro- and early mesopore region, pore volume decreases with TOC from w∼ 0.30–0.75 nm and increases with TOC from w∼ 0.75–3.60 nm. Furthermore, TOC in shale increases the specific surface area and pore volume (micro-, meso-, and total pores), enhancing both sorption and free gas storage capacities. Cambay shales were likely deposited in three distinct environments, with precipitation probability (P+) values of 1, 0.7–0.8, and 0.5, as revealed by a fractal dimension (Ds) analysis of multiple samples.

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Section: Brief Overview and Geological Setting Of The Cambay Basinmentioning

confidence: 99%

Concurrent influence of geological parameters on the integrated nano-pore structure and discretized pore families of the petroliferous Cambay shale assessed through multivariate dependence measure

et al. 2023

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“…However, doubt persists regarding actual nature and effect of transgressions in shallow marine and continent-margin transitional depositional areas, and the role of climatic forcings, tectonism, and sedimentation in controlling palaeogeography and shaping resultant stratal stacking patterns (Bhattacharya et al 2018). High-resolution sequence-stratigraphic study backed by detailed sedimentary facies analysis is useful to understand the appropriate transitional relationship between fluvial and marine processes in terms of major transgressive-regressive cycles in response to tectonoeustatic changes in such basins (Bhattacharya et al 2018;Jaiswal et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Palaeogeographic reconstruction of a fluvio-marine transitional system in Narmada rift basin, India — Implications on Late Cretaceous global sea-level rise

2020

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Rising sea-levels in tectonically active epicontinental basins often lead to varied depositional settings and palaeogeography, mostly influenced by the net accommodation resulting from mutual interference of the extent and nature of landward encroachment by the sea and the net sedimentation. The Cenomanian Nimar Sandstone Formation, Bagh Group, Narmada rift basin, uniquely portrays the effect of sea-level rise within an intra-cratonic setting and attributes to the corresponding palaeogeographic changes in west-central India. An integrated sedimentological–sequence-stratigraphic study of the broadly fining-upward Nimar Sandstone Formation (thickness ~ 20–30 m) depicts the actual nature of changeover from a fluvial to a marine-dominated transitional depositional setting. Detailed sedimentological study reveals total seventeen facies, grouped in five facies associations, viz., the channel-fill facies association (FA-1), the overbank facies association (FA-2), the fluvial-dominated fluvio-tidal facies association (FA-3), the tide-dominated fluvio-tidal facies association (FA-4), and the shoreface facies association (FA-5). Overall facies architecture indicates a west-to-eastward marine encroachment, resulting in stacking of three distinct palaeo-depositional conditions: (i) an initial fluvial system with channel and overbank, changing into a tide-influenced fluvial bay-head delta in the inner estuary, followed by (ii) marine encroachment leading to a tide-dominated central estuary with inter- to sub-tidal settings, and finally, (iii) with further intense marine encroachments, a wave-reworked open shore condition in the outer estuary zone. The overall fining-up succession with a systematic change from fluvial to marine-dominated depositional systems points to a landward shift of the shoreline, signifying a major transgressive event correlated to the Cenomanian global sea-level rise. Characteristic stratal stacking patterns point to four coarsening- and fining-up hemicycles, embedded within the major transgressive succession. These high-frequency cycles attest to the varied interplay of sedimentation, tectonics and sea-level changes, and the resultant net accommodations. A palaeogeographic model is proposed based on the high-frequency transgressive–regressive hemicycles, which envisages the evolution of the depositional environments in relation to the Cenomanian eustatic rise in the intra-cratonic riftogenic fluvio-marine transitional basinal setup.

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A Review of Stratigraphy, Depositional Setting and Paleoclimate of the Mesozoic Basins of India

Dasgupta

2021

Mesozoic Stratigraphy of India

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High resolution sequence stratigraphy of Middle Eocene Hazad Member, Jambusar-Broach Block, Cambay Basin, India

Cited by 14 publications

References 33 publications

Concurrent influence of geological parameters on the integrated nano-pore structure and discretized pore families of the petroliferous Cambay shale assessed through multivariate dependence measure

Concurrent influence of geological parameters on the integrated nano-pore structure and discretized pore families of the petroliferous Cambay shale assessed through multivariate dependence measure

Palaeogeographic reconstruction of a fluvio-marine transitional system in Narmada rift basin, India — Implications on Late Cretaceous global sea-level rise

A Review of Stratigraphy, Depositional Setting and Paleoclimate of the Mesozoic Basins of India

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