The Describe Of Lithology And Facies Of Volcanic Rocks And Analysis Of Factors Controling Volcanic Reservoir In Che47 Wellblock Of Chepaizi Area

In order to research the Carboniferous accumulation model of Chepaizi area,this thesis,which is based on previous research results,characterizes and analyzes the lithology and facies of volcanic and predicts the favorable volcanic reservoir by studying the lithology and facies characteristics of volcanic and its seismic facies.These works will lay a foundation for further exploration and development of volcanic reservoirs in study area.This paper comes to conclusions as follows:(1)There are three main lithofacies in the study area: explosive facies,effusive facies and volcanic sedimentary facies and the alternating sequence of explosive and effusive facies is the most common.(2)Based on the lithology characteristics and electrical characteristic,the Carboniferous can be divided into three periods and nine groups of rhythms strata from bottom to top and explosive facies is the best reservoir.(3)According to the facies maps,porosity and permeability analysis data,it was further confirmed that explosive facies with high-quality porosity and permeability is the most favorable reservoir,followed by volcanic sedimentary facies and effusive facies.(4)By the analysis of drilling seismic facies in the research area,the high-yield wells in Carboniferous are characterized as the near-crater subfacies,the “anti-roof” mode constituted by volcanic attitude and formation interfaces,the distinct multi-stages volcanism and the developed weathering crust reservoir.