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Yuanjiang East Sub-sag Of The Paleogene The Taoyuan Group - Of Hanshou Sedimentary Systems And Sequence Stratigraphy

Posted on:2007-05-04Degree:MasterType:Thesis
Country:ChinaCandidate:L W YouFull Text:PDF
GTID:2190360185473089Subject:Mineral prospecting and exploration
Abstract/Summary:PDF Full Text Request
The projections and deployments of petroleum exploration in Yuanjiang sag are restricted by lacking of research on sequence stratigraphy and depositional system. This paper is a comprehensive research on sequence stratigraphy and depositional system of Taoyuan-Hanshou formations in East-Yanjiang subsag based on the principle of sedimetology and sequence stratigraphy, taking use of the materials of well drilling, logging and seismic survey. According to the identification marks of sedimentary facies, having established rock-logging-facies transformation model from the typical interval, the facies are defined in each of the 24 wells in this area, they are 5 kinds of facies in total, including: lacustrine, delta, fan- delta, alluvial fan and fluvial facies, and 12 kinds of micro-facies. In terms of the different forms of the seismic wave reflection terminal, The Paleogene stratum in East-Yanjiang subsag is divided into 2 seismic sequences or 6 seismic subsequences, and the seismic facies is analyzed in seismic subsequences. On the base of research on sedimentary facies and seismic sequence, the Taoyuan-Hanshou formations in paleogene are divided into 7 sequences and 16 systems tracts. The bottom boundary of SQ1 and SQ4 sequence each which consists of lowstand systems tract, transgressive systems tract and highstand systems tract is I-type sequence boundary; and the bottom boundary of SQ2, SQ3, SQ4, SQ5, SQ6 and SQ7 sequence each which consists of transgressive systems tract and highstand systems tract is II-type sequence boundary. The characteristics of combination and evolution of depositional systems, variety of strata, and distribution of sandbodies are analyzed in each systems tract. Fanally, it is known that the main controlling factors of sequence development are tectonic movement and climate change.
Keywords/Search Tags:Continental fault basin, Sedimentary facies, Sequence stratigraphy, Depositional system, Paleogene, East-Yanjiang subsag
PDF Full Text Request
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