| Bonan Sag is the three-level negative tectonic unit in Zhanhua Depression of Jiyang Depression.The exploration area is about 1000km~2 and several oil-bearing series were found in Bonan Sag from Archean to Neogene.The second member of Shahejie Formation Lacking of systemic and complete research,because the main research series were the thrid and forth member of Shahejie Formation.All above restricted oil&gas exploration and development schedule and reserves planning of Bonan Sag.This paper makes full use of drilling,logging,drill core,logging and seismic data establish high resolution chronostratigraphic correlation framework,carry out systematic research on the sedimentary characteristics,reservoir characteristics,the main controlling factors and the formation rules of oil and gas of the second member of Shahejie Formation in Bonan Sag.then sedimentary system were researched on the basic of those framework.It was concluded that fan delta and beach-bar were the two kinds of sedimentary system,which can be devided into six kinds of sedimentary microfacies by futher in the second member of Shahejie Formation of Bonan Sag.The plane and spatial distribution characteristics of various kinds of sedimentary facies and favorable reservoirs were researched,Based on the analyzing of oil pool and experimental data,geochemical analysis data,the main controlling factors and the formation rules of oil pool were studied,the vertical and horizontal distribution characteristics of oil pool were predicted in the second member of Shahejie Formation in Bonan Sag.The knowledge of this paper provided reliable basis for the further exploration deployment and make a realistic guiding role in Bonan area.Meanwhile,it play an important strategic role for the exploration and development and reserve replacement of Zhanhua Depression. |
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