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Sedimentary System Study Of Eocene For D Block Of Burma

Posted on:2013-01-12Degree:MasterType:Thesis
Country:ChinaCandidate:J LiFull Text:PDF
GTID:2230330374999916Subject:Mineral prospecting and exploration
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Basing on full collecting and collating the information of predecessors to the research object, we use the tectonic geology, sedimentary petrology, petroleum geology and reservoir geology theory to research. We base on the wild outcrop section and the core chip material, in addition, in combination with drilling material and seismic data. Under the background of regional structure of Burma, through the method of combination macroscopic observation with indoor micro analysis, we analyze Burma D block material sources, sedimentary system features and sedimentary facies, then predict favorable exploratory layer systems and direction of oil and gas.In this paper, using the heavy mineral analysis, petrological characteristics of conglomerate and rock skeleton characteristic analysis method, we study the direction of material source and the nature of parent rocks. The results show that the material sources of basin are from the east and the northeast, and the properties of parent rocks are mainly shallow metamorphic rocks and volcanic rocks, a little sedimentary rocks.Under the influence of material source factors, and through the recognition of the phase signs, we identify four main depositional systems in langxin formation, tilin formation, taben formation and yaohe formation of Eocene. They are alluvial fan sedimentary system. wave dominate delta depositional system. no barrier coast sedimentary system and shallow continental platform depositional system. Among them, the alluvial fan sedimentary system is mainly consisting of fan root and fan middle. Wave dominate delta depositional system is mainly consisting of delta front and delta plain. Shallow continental platform depositional system is mainly consisting of inner shelf deposition.On the basis of the sedimentary system classifications and characteristic, we establish sedimentary modes of Eocene, mainly including alluvial fan-delta depositional model which mainly develops in tilin formation and pengdang formation, shallow continental platform depositional mode which mainly develops in langxin formation, taben formation and yaohe formation.According to sedimentary system types, characteristics and depositional models, and in combination with regional tectonic background, we proceed depositional exhibition of facies. Langxin formation belongs to carbonate deposition early. As sea levels rising fast, it transits for continental shelf deposition. Tilin formation belongs to coastal deposition. Taben formation develops delta face near the Yagyi-1well, and to the south it is gradual transition for shallow sea-continental shelf deposition. Gangao profile of Pengdang formation develops alluvial fan-delta deposition, and to the north and south, it is gradual transition for shore sea-shallow sea continental shelf deposition. Yaohe formation may be transitional facies-shallow sea continental shelf phase, and to the south it is shallow sea deposition.Analyze remnant petroleum generative depression and favorable reservoir face belts for Langxin formation, Taben formation and Yaohe formation, and then predict favorable exploratory layer systems, favorable layer systems for prospecting is Langxin formation providing oil source rock and Tilin formation acting as reservoir, Taben formation not only providing oil source rock but also as reservoir, the last Taben formation providing oil source rock and then Pengdang formation as reservoir.
Keywords/Search Tags:D block of Burma, Eocene, Sedimentary system, Favorable layer sy-stems for prospecting
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