首页> 外文会议>Fifth International Conference and Exhibition on Petroleum Geochemistry and Exploration in the Afro-Asian Region; Nov 25-27, 2000; New Delhi >Evaluation of source rocks for possible generation of hydrocarbon potential in yet-to-discover areas in Western Offshore, India
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Evaluation of source rocks for possible generation of hydrocarbon potential in yet-to-discover areas in Western Offshore, India

机译:评估印度西部近海尚未发现地区可能产生烃潜力的烃源岩

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Exploration history of Western Offshore, India shows that more than 45% of exploratory wells drilled during the last three decades were dry. Source rock studies in specific intervals of these dry well sediments is limited to 30% of the wells. The situation warrants a challenging task for the explorationists to consider as many supplementary leads as possible to reduce the risk of drilling dry holes. An attempt has been made in this paper to use the limited available source rock studies data to evaluate the likely generation of hydrocarbon potential, in different basins/sub-basins/blocks which include Gulf of Hutch, Kerala-Konkan basins, Saurashtra, Tapti-Daman, Bombay High-DCS, Heera-Panna-Bassein-Neelam, Shelf Margin, Ratnagiri sub-basins/blocks. Emphasizing those areas, where hydrocarbon discoveries are yet to be made, various components of the source rock studies data have been analysed and an integrated approach is attempted to understand the migration/generation paths of hydrocarbons from the matured source areas to the possible prospective traps in the whole western offshore. Results have been discussed for three broad stratigraphic intervals namely Paleocene, Eocene plus Oligocene and Miocene. The pyrolysis data of source rocks generated through Rock Eval study have been used choosing selective wells to represent basin/sub-basins. Source rock parameters like S_1, S_2, Migration Index, Total Genetic Potential, Hydrogen Index, Oxygen Index, Productivity Index, T_(max), TOC etc. are used for hydrocarbon generation evaluation. A comparison has also been made with the earlier estimated prognosticated resources of hydrocarbons in the Western Offshore.
机译:印度西部近海地区的勘探历史表明,在过去的三十年中,超过45%的勘探井是干燥的。这些干井沉积物在特定间隔内的烃源岩研究限于井的30%。对于勘探人员来说,这种情况是一项艰巨的任务,要考虑尽可能多的辅助引线以减少钻干孔的风险。本文尝试使用有限的可用源岩研究数据来评估在不同的盆地/子盆地/区块中可能产生的碳氢化合物潜力,这些盆地/亚盆地/区块包括哈奇湾,喀拉拉邦-康坎盆地,索拉什特拉,塔皮提-达曼,孟买高级DCS,Heera-Panna-Bassein-Neelam,货架边距,Ratnagiri子流域/区块。强调那些尚未发现油气的区域,分析了烃源岩研究数据的各个组成部分,并尝试采用一种综合方法来理解烃从成熟烃源区到可能的潜在圈闭的运移/生成途径。整个西部近海。已经讨论了三个较宽的地层间隔的结果,即古新世,始新世加渐新世和中新世。通过岩石评估研究生成的烃源岩的热解数据已用于选择选择性井来代表盆地/次盆地。诸如S_1,S_2,迁移指数,总遗传潜能,氢指数,氧指数,生产率指数,T_(max),TOC等烃源岩参数可用于评估油气成藏。还与西部近海地区较早估计的碳氢化合物预后资源进行了比较。

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