Sedimentary Mode Of Glacis Carbonate Platform

Amu-Darya basin in turkmenistan is our largest exploration and developmentarea of marine carbonate reservoirs out of china, where gas efficient exploration anddevelopment directly affect our strategic target of west-east gas transmission andnational energy security. Therefore, it has important significance for guidance ofreservoir exploration to analyse carbonate sediment feature,sedimentary facies andreservoir character in this area.Based on the observation and description of a large number of drilling cores inmacroscopic and microcosmic aspects, this article deeply analyse sequence character,sedimentary character, spreading of sedimentary facies, sedimentary mode, reservoircharacter and the like in Callovian-Oxfordian of Upper-Middle Jurassic by the theoryguidance of sequence stratigraphy, sedimentology and reservoir geology with data aslogging, mud logging, seismic and analysis assay.Generalization of various characteri-stics of facies indices of Callovian-Oxfordian depend on rock component, palaeophyte, logging and seismic facies is aneffective evidence for sedimentary facies identification, where we can get threeimportant searching development and innovations.①With identification ofcharacteri-stics of facies indices and single well facies searching, sedimentary faciescategory of Callovian-Oxfordian can be divided into evaporate platform, restrictedplatform, open-platform, platform marginbeach, slope and basin facies. This papercompiles plane distributive maps of Callovian-Oxfordian facies with the basement ofsequence stratigraphy framework, and then builds sedimentary mode of―Open rollingtrimmed glacis platform‖which is fit for this area, which is the innovation forenriching and improving theory system about carbonate platform sedimentary face mode.②This article has sequence stratigraphy search for Callovian-Oxfordian inAmu-Darya basin under the guidance of sequence stratigraphy. The comprehensiveanalysis of logging and seismic data proved Callovian-Oxfordian can be divided intothree third-ordered sequence named SQ1, SQ2and SQ3, which experiencessedimentary processes of glacis platform-trimmed glacis platform-glacis platform,and there has large scale organic reef facies in SQ2and SQ3.③On the foundation oflithology feature,the type and evolvement of reservoir pore space and pore structurecharacter analysis, Callovian-Oxfordian reservoir has category evaluation. Theresearch show that development zone of organic reef bank mainly have wellreservoirs while other facies reservoirs have poor physical property. Sedimentationand diagenesis are main factors that affect reservoir physical property which provedby analysis of factors Influencing physical.