| Zhuangxi area is located in the northeastern of Zhanhua Sag and noth of Gubei Sag.It is a sub-ordinary negative structure unit among Gudao buried Hill,Chengdao buried Hill,Changdi Potential mountain and Chengdong uplift.Study shows that Zhuangxi area has a bright exploration prospecting.Based on seismic data,drilling,well logging,core data and analysis materials,guided by sedimentary theory and the application of geostatistics,this paper systematically studied the characteristics of provenance systems,sedimentary and reservoir,meanwhile,this article makes a primary discussion for the distributing characters of the advantageous reservoir.On the integrated analyses of the seismic,well logging and well drilling data,based on the classified rules and identified symbol of the sequence stratigraphy,the sequence framework is established in the Shahejie Formation of Zhuangxi area.Four sequence boundaries SB1?SB2?SB3?SB4 are recognized.Therefore,Es3-Es1 in the Shahejie Formation of Zhuangxi area can be divided into four 3rd order sequences,including SQ1?SQ2?SQ3?SQ4,exactly corresponding to the stratum of Es3-Es1.According to dip logging data,glutenite percentage seismic attribute abstraction and analysis of geomorphic feature,the provenance characteristics were comprehensively discussed in this paper.The results suggested that,there are two sources in the Shahejie Formation in Zhuangxi area,that were Chang Ti potential mountain and Zhuangxi buried hill.Furthermore,Chang Ti potential mountain was the main source in Zhuangxi area.Fan deltas facies,turbidite fans,bar and lacustrine are the main precipitation facies in the Zhuangxi area.Fan deltas dominate the edge of lake basin,close to Changdi fault of the 3rd member of Shahejie formation.Turbidite fan dominate the declining of growth fault in lake-basin center;Fan deltas exist in the edge of lake basin,next to Changdi fault in the 2nd members of Shehejie Formation.Sandy beach and life-form shoal developed in the far northwest corner and around the Zhuangxi Buried Hill.Successive development and multiple source supply defines the characteristics of sedimentary systems.The distribution of sand body are controlled by geomorphology and fault.The sand of Es1 is carbonate reservoir,belongs to medium-low porosity,low and extra-low permeability reservoir.The reservoir space of oil bearing sandstone is mainly secondary porosity.The sand of Es1 is clastic reservoir,belongs to mid-low porosity,extra-low permeability reservoir.The reservoir space of oil bearing sandstone is mainly secondary porosity,meanwhile,primary pores commonly developed.Based on the study of physical properties,diagenesis and reservoir space of reservoir,the distribution characteristics of sedimentary systems,the identification methods of sedimentation-diagenesis,the distribution characteristics of favorable reservoirs are predicted,the development of favorable reservoirs mainly depended on sedimentary facies,which generally distributed in annuluses.Compared to the fan delta plain,fan delta front is the advantageous sedimentary facies for the favorable reservoirs.Biolithite limestone facies were easily controlled by diagenesis,secondary porosity commonly formed by dissolution and tended to develop secondary favorable reservoirs. |
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