Abstract:

Five types of sequence boundaries within the third-order sequence of Donghe sandstone in Tarim Basin are recognized through the detailed analysis of outcrop and core data:the third-order sequence boundary,parasequence group boundary,parasequence boundary,stratum group boundary,and stratum boundary.Based on the response characters of conventional logging and dip logging through sequence boundaries,the standards and methods of sequence boundary identification using logging data are proposed,including the identification model of conventional logging data,the identification model of dip data with long window-length processing,the identification model of original dip-logging conductivity curves,the identification model of precise dip-processing data,etc.By applying the above-mentioned models to the multi-sequence boundary identification and correlation in all wells of the oilfield,five orders of sequence boundaries are identified,and one third-order sequence,one parasequence group(sandbody group),twelve stratum groups(substratum zone) and fifty stratum(single sandbody) are recognized.As a result,the high-resolution sequence stratigraphic framework of Donghe sandstone is established.

Key words: sequence boundary, logging response, Donghe sandstone, Tarim Basin