| Changfeng zhentectonic belt is located in the south of Wenan slopes in Baxian sag,is one of the four nose-like structure belt of wenan slopes.The tectonic belt is the slope of the east ward and west lean with inheritance and development of slope,fracture is not developed,is a weak tectonic activity area.because the structure is not developed,the belt become the lowest prospecting area of the whole slope.the density of drilling is only 0.1067/km2.Currently the oil field is found only in the S88 and W96 well area.Due to the poor quality of seismic data,the study of sedimentary reservoirs is not systematic, and the mechanism of hydrocarbon accumulation is unknown.in recent years, the exploration of microstructure and lithologic reservoirs has not made much progress.Based on the theory of sequence stratigraphy,and comprehensive drilling, seismic and analysis of test data,this paper establishes a unified three or four isochronal stratigraphic framework in Changfeng Town.The formation is divided into six three-order sequence,and based on the sequence division,a four-order sequence is divided in the main purpose of Ed3 and Esl sections.Using sequence calibration,fifteen sequences are fine structure interpreted,and the sequence framework is builded.the sequence interface is analyzed, the sand control mechanism of ancient landform is studied in high-resolution sequence framework.The sedimentary background and the direction of provenance are dissected.Using seismic attribute analysis,logging constraint inversion technology,the types of sedimentary facies of each sequence,sedimentary characteristics and plane distribution of sand body are studied.The favorable reservoir facies belts and distribution area are predicted.Combined with the analysis of characteristics of hydrocarbon accumulation in the area,we points out that the next step prospecting reservoir type and lithologic reservoir development area. |
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