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Single-sandstone-layer sedimentary microfacies and favorable sandbody prediction of Putaohua reservoir in south Gulong sag,Songliao Basin
Pages: 517-525
Year: Issue:  4
Journal: Oil & Gas Geology

Keyword:  Putaohua reservoirsedimentary mircofaciesfavorable sandbodysouth Gulong sagSongliao Basin;
Abstract: Based on characteristics and spatial distribution patterns of single-well sedimentary microfacies ,gross-to-net ra-tio and thickness of single sandstone layer of the Putaohua reservoir in south Gulong sag of Songliao Basin ,we studied the spatial distribution pattern of sedimentary microfacies and predicted favorable sand bodies .The Putaohua reservoir con-sists of various sedimentary microfacies including distributary channels ,interdistributary channels ,mouth bars,front sheet sand ,front delta mud and shallow lake mud ,with sediments mainly sourced from the north and the west .It is of a typical shallow-delta deposit characterized by poor-developed mouth bars but wide front sheet sandstones .From bottom to top ,the thickness and the grain size of sandstone layers increase with the lake level dropping ,indicating a progradational strati-graphic sequence .In addition ,the areas of front sheet sandstones also enlarge upwards and their shapes change from EW -trending strips in the lower part into large sheets in the upper part .The provenance is mainly located in the north at the early stage ,while is mainly located in the west at the late stage .The early banded sand layers and the later large sheet-shape lenticular sand layers at the center of the sag are favorable sandbodies .
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