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Baxian Depression Shahejie ~ Dongying Formation Depositional System Of Subtle Reservoir Prediction

Posted on:2006-02-13Degree:MasterType:Thesis
Country:ChinaCandidate:Y H WangFull Text:PDF
GTID:2190360152486013Subject:Oil and gas field development
Abstract/Summary:PDF Full Text Request
Based on the theory of sequence stratigraphy, the paper aims to study sequence stratigraphy and reservoir in Paleogene in Baxian Depression, which comprehensively uses various data such as seismic data, cores and well logging data.On the basis of the former achievements and the regional research, exerting the theory of sequence stratigraphy and high resolution sequence stratigraphy in continent, the author makes divisions of the Paleogene sequence stratigraphy in Baxian Depression by full use of the 3-D seismic profiles, combined with cores, well logging and drilling, and builds up the sequence stratigraphic framework in Paleogene.The sequence of Paleogene is one 1st order sequence, and which can be divided ulteriorly into three long-term base-level cycles (2nd order sequence) and 10 intermediate-term base-level cycles (3 rd order sequence). The 2nd order sequences include Dongying Formation ~ Shahejie 2 Member, Shahejie 3 Member, Shahejie 4 Member ~ Kongdian Formation. Combining of well and seismic and well connection contrasts, the author also describes the developing characteristics of the sequences in detail.Based on the sequence stratigraphic framework, the sedimentary systems of Dongying Formation, Shahejie 1 Member and Shahejie 2 Member are analyzed in detail. Six kinds of depositional systems can be identified. They are respectively turbidity fan, brackish lake, shore and shallow lake-beach, delta, alluvial fan and river-alluviation depositional systems. On condition of this, the distribution map of depositional systems and sedimentary facies have been workout, and make the distribution pattern clearly in Baxian Depression. Fan delta and brackish lake systems are developed within the subbasin, the braided delta and alluvial fan system on the slope in Shahejie 2 Member. Delta, turbidity and river-alluviation systems are developed in Shahejie 1 Member. River-alluviation and littoral and shallow lake systems are mainly developed in Dongying Formation.According to the thread of stratigraphic distribution, sedimentary and sandstone distribution controlled by structure and paleo-morphic, the paper analyzes the originated condition and types of subtle traps in Paleogene in Baxian Depression, predicts a series of favorable subtle traps, combined with the configuration among generating rock, reservoir and cap and with the generating conditions of oil-gas reservoir, the paper designates two prospecting zones: the lithic traps in the south slope, and the tectonic-lithic and stratigraphic traps in the midst of slope, according to the relationship between the distribution of slope-break and the sandbody of delta in Shahejie Formation.
Keywords/Search Tags:Baxian Depression, Paleogene, sequence stratigraphy, sedimentary system, subtle trap
PDF Full Text Request
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