| The paper starts with the analysis of regional geological backgrounds,and uses seismic stratigraphy,sequence stratigraphy,sedimentology,petroleum geology and other related theories and research methods as guidance.Based on the existing seismic interpretation and geological research achievements,the paper uses drilling,logging and seismic data as objects.By adopting the combination of the traditional geological and seismic exploration technology research methods,single stratigraphy,seismic sequence analysis,seismic facies and sedimentary facies analysis and other related researches have been performed.Then the conditions for reservoir formation in the region predict the favorable exploration areas.With core data,logging data,seismic data as the foundation,combining the theory of sequence stratigraphy,sedimentology,dividing the study area of the set of feixianguan sequence interface,and the feixiguan group in R area was divided into four three-level sequences and 16 four-level sequences.The paleogeomorphology of main sedimentary units in the area was analyzed by using stratum flattening and seismic attribute analysis,so that the distribution characteristics and migration law of positive topography on the edge of each sequence platform and inside platform can be clarified.Based on the seismic facies analysis,the seismic facies types and the plane distribution characteristics are summarized,and the sedimentary facies characteristics of the study area are analyzed based on the comprehensive interpretation of geological(limited core data),well logging,earthquake and known seismic facies patterns,combined with regional sedimentary background and previous research results.According to the distribution regularity of oolite beach,the oolite beach development in the study area can be divided into three categories:1 class oolite beach is mainly inherited oolite beach,growing in the platform margin and above high parts of platform,this kind of oolite beach mainly in the group of Feixianguan 1 to Feixiangua 2;? class oolite beach is an inherited oolite beach,located in underwater palaeohigh area,this kind of oolite beach is the products of four or five sea level cycle,and the main development form is in the transgression period of Feixianguan 1 and Feixianguan2;III class oolite beach's lateral migration can be superimposed oolite beach body,mainly formed in the middle-late period of Feixianguan2 when the sea level drops.Through the analysis of seismic sequence evolution and oolitic distribution pattern,the development site,size and storage of oolitic beach are still controlled by factors such as hydrodynamic conditions and exposure time.Therefore the platform marginal zone and platform shoal within ancient landform are high hydrodynamic strongest,expose the most adequate area,also is the most favorable area of the development of beach body.However,the formation of the oolitic beach in the slope area is more controlled by the secondary level of sea level cycle,so the water energy is low and the exposure time is limited,and its development scale and storage performance are relatively minor.Based on the comprehensive interpretation of logging data,lithological data and seismic data,the sedimentary facies'layout plane of three three-level sequence(TSQ1,TSQ2,TSQ3)of Feixianguanl and Feixianguan2 were compiled.This study predicts the favorable exploration area,of Feixianguanl to Feixiangua2.The main distribution of oolitic beach of the Feixianguanl is both in the the southwest of L68 well and Yutongliang area,and in the east of the L63 well.The oolitic beach of the Feixianguan2 mainly distributed in Jiange area and Jiulong hills constructor body. |
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