Depositional features of the middle jurassic formation of field N and their influence on optimal drilling schedule

D. Mishina, V. Rukavishnikov, B. Belozerov, A. Bochkov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Middle Jurassic formation of Field N presented by 4 hydrodinamically connected layers (J5-6, J4, J3 and J2) contains 42 % of field STOIIP. J2-6 formation is characterized as gas-oil-condensate massive lythologically and tectonically screened accumulation with gas cap (J2, J3 layers) and bottom water (J5-6 layer), oil is predominantly contained in J3 and J4 layers. There is high risk of early gas coning from gasbearing layers to oil producing wells indicated from production test results which can significantly decrease the life of well. For selection of more optimal drilling schedule it is necessary to take onto account resik of early gas coning and determine distinctive features within gas-saturated zone that can reduce it. Presence of thick shale barrier between J2 and J3 layers with range of thickness from 0 to 30 m is recognized as beginning of transgression cycle, and in case of gas cap containing only on J2 layer this barrier with thickness more than 5 m can extensively prevent early gas coning into oil producing wells. Integration of geological information represented by constructed probability map and petrophysical information represented by kh map allows more precise determination of optimal drilling schedule.

Original languageEnglish
Title of host publication6th Saint Petersburg International Conference and Exhibition on Geosciences 2014
Subtitle of host publicationInvesting in the Future
PublisherEuropean Association of Geoscientists and Engineers, EAGE
Pages321-325
Number of pages5
ISBN (Print)9781632665393
DOIs
Publication statusPublished - 2014
Externally publishedYes
Event6th Saint Petersburg International Conference and Exhibition on Geosciences 2014: Investing in the Future - Saint Petersburg, Russian Federation
Duration: 7 Apr 201410 Apr 2014

Publication series

Name6th Saint Petersburg International Conference and Exhibition on Geosciences 2014: Investing in the Future

Conference

Conference6th Saint Petersburg International Conference and Exhibition on Geosciences 2014: Investing in the Future
CountryRussian Federation
CitySaint Petersburg
Period7.4.1410.4.14

ASJC Scopus subject areas

  • Geochemistry and Petrology

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