Application of Highresolution Sequence Stratigraphy to the Sand Reservoir Prediction for 8th Member of Lower Shihezi Formation in Sulige Gas Field, Ordos Basin

Key words: 
• highresolution sequence stratigraphy /
• stratigraphic framework /
• lower Shihezi Formation /
• Su 6 well area /
• reservoir prediction

Abstract: The highresolution sequence stratigraphy theories and technologies are widely used in the exploration and exploitation of subtle lithologic gas reservoir, taking it as a direction ,through dynamic analysis on baselevel cycle structure and stacking pattern , combined with the comprehensive studies of outcrops, cores and well logs,two longterm, five middleterm and fourteen shortterm cyclic sequences from the lower Shihezi Formation of Su 6 well area in Sulige gas field are classified. the structure types, sedimentary cycles, stacking patterns of shortterm, middleterm, longterm cyclic sequences and the relationship between cyclic sequences and distribution of favoring sand are discussed in detail. A chronostratigraghic framework is established by reference to the longterm and middleterm cycle sequences, in which the characteristics of different type of sand are discussed in detail. Based on the division and correlation of individualsandbody correspond to shortterm cyclic sequence,directing by the method of lithofaciespaleogeographical mapping, the sedimentary facies and sand distribution maps of the short or middleterm cyclic sequences come into being , the distribution of favoring sand reservoir can be predicted.