Sedimentary facies characteristics and superposition relationship of sand body of Yan'an Formation in Zhangtianci Oilfield,Ordos Basin
The identification of sedimentary microfacies in small layers and the fine characterization of single sand bodies are important contents of the fine development of oil and gas reservoirs.Based on data such as rock cores,thin sections,and logging,this paper studied the sedimentary facies markers such as rock type and color,sedimentary texture,sedimentary structure and logging facies characteristics of Yan 9 oil-bearing formation in Zhangtianci area,Ordos Basin.It was found that Yan 9 reservoir is mainly composed of gray and light gray lithic arkose,with good sorting and rounding.Research suggests that the Yan 9 oil-bearing formation is mainly composed of river sediments,belonging to the subfacies of network river channels,which can be specifically divided into network river channels,inter river depressions,and crevasse fan sedimentary microfacies.The vertical superposition types of Yan 9 oil-bearing formation sand body in the study area can be summarized as independent type,superposition type and cutting superposition type.The types of transverse stacking can be divided into spacer type,lap type,cutting type and substitution type.
Zhangtianci OilfieldYan'an Formationsedimentary microfaciessand body superimposion relationYan 9 oil-bearing forma-tion
NETL
NSTL
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