A New Approach for the Realistic Evaluation of Very Thin Reservoirs of Krishna Godavari Basin, East Coast, India

Yadav, Lalaji; Dutta, Tanmoy; Kundu, Ashish; Sinha, Neeraj

doi:10.2118/132970-ms

Cited by 6 publications

(2 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The deep water reservoirs are very complex and heterogeneous ranging from massive thick sand to highly laminated very thin sand shale sequence. Hydrocarbon is found in Permo-trassic and cretaceous sediments [19]. Highly fractious limestone is found in Pasarlapudi formation, Bhimanapalli formation and clayey formations are Narsapur, Ravva, Godavari [4].…”

Section: Eastern Coastmentioning

confidence: 99%

“…-Effort should be done to establish all the potential petrophysical data and after that geotechnical order needs to be developed which will corroborate the litho column (Basic technical study). -Using High resolution evaluation of laminar sand and laminated shaly sand analysis proper petrophysical properties can be established for such a complex reservoir [19]. After the well litho column is established and well studied then suitable candidate of MPD should be chosen.…”

Section: Krishna -Godavari Basin -[mentioning

confidence: 99%

See 1 more Smart Citation

Optimization of Drilling & Production Operations By Application of MPD Technique on Indian Offshore Basins - A Strategic Approach

et al. 2011

View full text Add to dashboard Cite

To maximize oil and gas production profitability, it is paramount to reach the whole reservoir and extract the hydrocarbon resources efficiently. In offshore environments well prospects are sited at fracture gradients and narrow pressure gradients. Thus in this type of environment drilling hazards are aplenty and this makes wellbore completion a tough challenge. If the wellbore is not completed properly then there can be an economic as well as environmental disaster. In such situations there often exists a drilling window between fracture pressure gradient and also pore pressure through which when drilling done yields out proper results. Thus this paper overviews the possibility of applying MPD technique in Well construction and completion in offshore conditions. The experimental as well as onsite usage of MPD technique has proved so far that this technique performs quicker and better than the conventional drilling technique which drills without any wellbore pressure management. Also the environmental hazards and risks related to conventional drilling usage in offshore hostile conditions are lowered through MPD. MPD can also reduce NPT as well as reduce drilling fluid loss which can in return lower the OPEX. MPD can also add value to production casings cementing operations in HPHT wells and also mitigate any further damage to wellbore.Here in this paper MPD techniques and its case studies of usage on various offshore fields of India are reviewed and then the unique challenges associated with application of MPD in offshore basins of India are highlighted. Also here a proper drilling program using MPD has been proposed for various petroliferous basins of India. Albeit few offshore basins of India which have established proven reserves, many are still loosely explored and thus with the information available a new proposal using MPD has been conceived here for basins which are petroliferous for further drilling activity in the proposed basin. This in return will add knowledge to the stakeholders, government and operators for future planning and development of field. An effective comparison between conventional and MPD technique has also been highlighted in this paper for regulators of hydrocarbon industry for basic understanding of MPD.

show abstract

Section: Eastern Coastmentioning

confidence: 99%

Section: Krishna -Godavari Basin -[mentioning

confidence: 99%

Optimization of Drilling & Production Operations By Application of MPD Technique on Indian Offshore Basins - A Strategic Approach

et al. 2011

View full text Add to dashboard Cite

show abstract

An integrated approach for reservoir characterisation in deep-water Krishna-Godavari basin, India: a case study

Mondal

Chatterjee

Chakraborty

2021

Journal of Geophysics and Engineering

View full text Add to dashboard Cite

The Miocene reservoirs in prolific Krishna-Godavari basin are mostly fluvial deposits and laminated or blocky in nature. The type of reservoir quality depends on associated geological environments. Due to several lateral variations in reservoir properties, a similar kind of workflow for reservoir characterisation does not work. Customised workflow needs to be applied in this area for estimation of petrophysical properties or rock physical analysis for reservoir quality prediction. As the major input of rock physical analysis is petrophysical properties, it is crucial to estimate these properties accurately. Meanwhile, it is also important to check the seismic sensitivity to change in fluid saturation in the reservoir characterisation process. The analysis assures the presence of reservoir and hydrocarbon contact in seismic sensitivity, which is essential for removing risk. Integrating the geological model with rock physical analysis for reservoir characterisation at the drilled well, the reservoir quality at undrilled prospects is predicted. In this study, the comprehensive study for reservoir characterisation of Miocene reservoirs consists of three different steps: calculation of petrophysical properties for mixed of thick and laminated sequence, rock physical analysis for identification of hydrocarbon reservoir and corresponding seismic sensitivity for change in saturation and finally the rock physics template for prediction of reservoir quality away from the drilled well. Results from the study have added significant value in de-risking the number of undrilled prospects in this area.

show abstract

A New Approach for the Realistic Evaluation of Very Thin Reservoirs of Krishna Godavari Basin, East Coast, India

Yadav

Dutta

Kundu

et al. 2010

SPE Asia Pacific Oil and Gas Conference and Exhibition

Self Cite

View full text Add to dashboard Cite

In thin bedded reservoirs high resolution borehole images are generally used to determine distribution of high quality, productive sands. Deep water Tertiary reservoirs of Krishna Godavari basin are generally very complex and heterogeneous, ranging from massive thick sands to highly laminated very thin sand/shale sequences with average bed thicknesses less than the vertical resolution of microresistivity-imaging tool. The image tool responds to the beds and features smaller than the vertical resolution but can not accurately determine laminar bed thickness which can be used as an integral part of lowresolution technique. In the absence of a well defined set of thin bed boundaries from image tools, an integrated of approach of forward modeling and inversion is also impractical for the accurate thin bed evaluation.A new approach of laminated shaly sand analysis is developed where laminar sand/shale estimation is based on generation of binary lithology on shale volume curve derived from micro-electrical resistivity. Formation beds as thin as the twice of the sampling interval can be generated through this technique in such a way that cumulative net sand fraction is restricted with integrated sand volume. Laminar shale volume from image tool calibrated to the LamCount core data has been considered to be the ground truth in the analysis. The volume of dispersed shale and the total and effective porosities of the laminar sand fraction are determined using a Thomas-Stieber volumetric approach. Water saturation is estimated from laminar sand-fraction resistivity derived from electrical anisotropy.Application of the methodology leads to an improved accuracy of reserve estimates and productivity predictions. Entire procedure is illustrated with an example of completely cored reservoir section. Results indicate that low resistive laminated reservoirs with very high shale fractions can be highly productive with reservoir quality equivalent or some times even better than massive thick beds.

show abstract

A New Approach for the Realistic Evaluation of Very Thin Reservoirs of Krishna Godavari Basin, East Coast, India

Cited by 6 publications

References 14 publications

Optimization of Drilling & Production Operations By Application of MPD Technique on Indian Offshore Basins - A Strategic Approach

Optimization of Drilling & Production Operations By Application of MPD Technique on Indian Offshore Basins - A Strategic Approach

An integrated approach for reservoir characterisation in deep-water Krishna-Godavari basin, India: a case study

A New Approach for the Realistic Evaluation of Very Thin Reservoirs of Krishna Godavari Basin, East Coast, India

Contact Info

Product

Resources

About