| The Zhuanghai area is located at the junction of the three buried hills covering structure belt of the Zhuangxi,Chengdao and Changdi.It is a high-yield area in the Zhanhua Depression and Jiyang Depression,and rich in oil and gas resources.But the Zhuanghai buried hill reservoir has complex structure,strong reservoir heterogeneity and difficult to develop.Based on previous studies,this paper is based on subject theory such as reservoir sedimentary facies,geophysical logging,reservoir geology,etc.Using core data,sheet data,drilling and logging data,seismic data,well logging data,and production dynamics data to comprehensive analysis of karst reservoir characteristics and karst reservoir development patterns of the Ordovician Badou Formation in the Zhuanghai area.And evaluated the karst reservoir.the following results were obtained:(1)Based on the core data,sheet data and single well logging data,and combined with the regional geological background and geological structure of the Badou Formation,the sedimentary facies of the Badou Formation are studied.It is believed that the Badou Formation mainly develop two microfacies of the intertidal Yunping and the tidal ashyunping.The reservoir is mainly developed in the intertidal cloud shoal;the sedimentary facies are stable in the longitudinal direction,and the upper part of the plane develops from the south to the north in order to develop the tidal mud Yunping,the intertidal Yunping,the tidal ashyunping,and the open platform.(2)Research is carried out through core data,drilling and logging data,logging data and seismic data.Severe well leakage,kick and venting that are prone to occur in karst reservoirs during drilling and logging.Its logging curve has characteristics such as disorder,frequent fluctuations and so on.The seismic section has strong reflection amplitude,good continuity and strong second longitudinal wave impedance.The main rock types of the Badou Formation rocks are microcrystalline dolomite and microcrystalline gray matter dolomite.The reservoir space is dominated by intercrystalline pores and fractures.The matrix properties are poor,and porosity and permeability relationship are positively correlated.Dissolution,dolomitization,and the structural rupture can greatly improve the reservoir permeability and permeability.Cementation,filling and de-dolomification are highly destructive,resulting in reduced reservoir permeability.(3)Through the analysis of core data and geochemical test data,the development of reservoirs in the Badou Formation is mainly affected by lithology,residual thickness,weathering crust,structure and sedimentary microfacies.The types of dissolution are mainly epigenetic atmospheric freshwater karst and organic acid dissolution.Based on the factors influencing the development of karst reservoirs,combined with the analysis of karstification in the eight steep groups,the development model of karst reservoirs was established,and reservoir development was controlled by faults and karst.(4)Based on the data of the Badou Formation matrix materials,log interpretation data and production dynamic data.The Type I,II and III reservoirs are mainly developed in the Bayi Formation,and the Type III reservoirs are mainly developed.The reservoir development level is low.Combined with the production dynamic data analysis,it is considered that the matrix physical property contributes little to the single well production,and the high-yield wells are mainly caused by the development of karst reservoirs.In the longitudinal direction of the reservoir,the weathering crust is mainly developed in the Badou Formation stratum.The atmospheric leaching is less infiltrated into the Majiagou Formation,resulting in the formation karst of the Majiagou Formation is not strong and the reservoir is not developed.The horizontal burial karst in the Himalayan period is the main factor for the difference in reservoir performance.Based on the characteristics of comprehensive sedimentary facies,karst reservoir development characteristics and karst development model,the paper combines the production dynamic data and seismic data to evaluate the development of karst reservoirs of the Badou Formation and identify the favorable areas for the development of karst reservoirs,mainly located near the ZH102 well area in the eastern part of the study area,and two karst reservoirs are predicted to be developed.It has a guiding role in the next development and deployment of the Badou group in the Zhuanghai area. |
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