Marine carbonate reservoirs in Tarim Basin are regarded as an important domain for reserve growth and production addition. However

the previous sequence stratigraphic division of the Lower Paleozoic carbonates is not suitable for target selection and development strategy optimization

influencing production. According to the genesis (such as tectonic

exposure and erosion

diagenetic intensity) of the sequence boundaries

and combining with data such as outcrop observations

seismic profiles

logging curves and core analysis of the marine carbonates in Tarim Basin

we recognized five types of marine carbonate sequence boundaries

including TypeⅠ (karsttype boundary from late strong uplifting)

TypeⅡ (microkarst type boundary from early forced regression and erosion)

Type Ⅲ (platformmargin type boundary from early dissolution and weak erosion)

Type Ⅳ (shallow reefbank type boundary from penecontemporaneous intermittent exposure)

and Type Ⅴ (contemporary underwater carbonate platform type boundary). Although the genesis and reservoir characteristics of these sequence boundaries are quite different

they can be easily distinguished according seismic

logging

drilling and core data. This division scheme is pracitical and can be used to guide selection of favorable plays

identification of sweet spots and selection of development well types.