Informatics Publishing Limited

N. C. Mehrotra ¹, P. N. Kapoor ¹

Affiliations
1 KDM Institute of Petroleum Exploration, ONGC, Dehradun, IN

Abstract

Palynology plays an important rote in cost effective exploration and exploitation of hydrocarbons. It consists of study of spores, pollen, dinoflagellate cysts, diatoms, nannoplankton, silicoflagellates, radiolaria, chitinozoa, algae and other organic remains.

Study of spore, pollen, dinoflagellate cysts and nannoplankton help in precise dating of sediments, marking of hiatuses and correlating surface and subsurface samples by giving absolute ages in million years. Source rock study helps in visual typing of kerogen, quantitative assessment of organic matter, paleoenvironment and palynofacies interpretation. Spectral analysis gives precise thermal maturation levels. The integration of source rock parameters helps in deciphering source rock potential facies. Correlation of burial history curves with the source rock potential facies helps in the determination of time and duration of hydrocarbon generation. Examples from different sedimentary basins emphasizing the role of palynology in hydrocarbon exploration are cited.

The biozonal comparisons and absolute pollen frequency (APF) values are being used for interpreting transgressive - regressive cycles. Paleogeographic maps can be reconstructed with palynological data. The chronostratigraphical correlation with seismic stratigraphy is being attempted in geologically synchronous stratal surfaces. Palynological studies support basin analysis leading to stratigraphic evolution and hydrocarbon prospect analysis. They aIso help to build sequence biostratigraphy and delineation of reservoir sands for effective reservoir management.

Keywords

Palynology, Hydrocarbons, Exploration, Dinoflagellate, India.

Full Text

     

S. N. Swamay ¹, P. N. Kapoor ¹

Affiliations
1 K D M Institute of Petroleum Exploration, ONGC, Dehra Dun, IN

Abstract

Exploration for hydrocarbon depends largely upon integration of surface and subsurface geological, geophysical and geochemical data. The vast majority of fossil hydrocarbons was formed by the alteration of sedimentary organic matter which originate from a variety of different source materials including aquatic and terrestrial biotas. Better understanding of the petroleum system (which includes source, migration and accumulation) in any basin is necessary for hydrocarbon exploration. Assessment of source rock is based upon parameters like organic matter types, richness of organic matter, maturation and paleoenvironrnent. The various geochemical and source rock palynological parameters are also considered synergistically to decipher source rock potential sequences in Cretaceous and Pre-Cretaceous sediments of Krishna-Godavari Basin.

Source rock palynological model is prepared for various formations viz., Pennar Shale, Krishna Formation, Golapalli Formation, Gajulapadu Shale, Raghavapuram Shale and Tirupati Sandstone to depict spatial and temporal distribution of source rock facies.

Keywords

Palynology, Hydrocarbon, Cretaceous, Source Rock, Krishna-Godavari Basin.

Full Text

     

N. C. Mehrotra , B. S. Venkatachala , P. N. Kapoor

Abstract

No Abstract.

Full Text

   

P. N. Kapoor ¹, R. K. Chauhan ¹

Affiliations
1 Geology Division, KDMIPE, ONGC, Dehra Dun - 248 195, IN

Abstract

The Core samples from the sea bottom sediments offshore Karwar are studied for palaeoecological interpretation and organic matter preservation. The samples are rich in different types of phytoplankton the diatoms are studied to interpret palaeoecology. The study suggests warm water tropical environment during deposition of sediments and age of the sediments is less than 0 65 million years.

Keywords

Diatoms, Ecology, Kerala-Konkan Basin.

Full Text

     

N. C. Mehrotra , B. S. Venkatachala , P. N. Kapoor

Abstract

No Abstract.

Full Text

   

N. C. Mehrotra , B. S. Venkatachala , S. N. Swamy , P. N. Kapoor

Abstract

No Abstract.

Full Text

   

Naresh C. Mehrotra ¹, B. S. Venkatachala ¹, P. N. Kapoor ²

Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow - 226 007, IN
2 KDMIPE, ONGC, Dehradun - 248 195, IN

Abstract

This paper presents an updated account of palynostratigraphic, source rock evaluation and palaeoenvironment data on Western Offshore and Krishna Godavari (K-G) Basins. Forty three dinoflagellate biohorizons have been identified in the Tertiary subsurface of Mumbai Offshore, facilitating a high resolution correlation of Oil bearing horizons. In K-G Basin integrated palynostratigraphic data and the composite general lithologies for the Mesozoic and Cenozoic have been presented in a tabular form; Eighty two dinoflagellate biohorizons have been identified. A very fine dinoflagellate based stratigraphic resolution has been achieved at most levels making it useful in geological modelling for hydrocarbon exploration in both Western Offshore and K-G Basin.

Useful information on matured organic matter facies distribution in Panna Formation (Western Offshore) and Cretaceous of K-G Basin has been summarized. Recently, potential source rock facies have been identified in Panna Formation in Western Offshore.

Limitations of present studies and future areas of focus have been outlined.

Keywords

Palynology, Hydrocarbon Exploration, Western Offshore, K-G Basin.

Full Text

     

N. C. Mehrotra , B. S. Venkatachala , S. N. Swamy , P. N. Kapoor

Abstract

No Abstract.

Full Text