Factors controlling the development of tight sandstone reservoirs in the Huagang Formation of the central inverted structural belt in Xihu sag, East China Sea Basin

XU Fanghao,XU Guosheng,LIU Yong,ZHANG Wu,CUI Hengyuan,WANG Yiran

Table 1 Rock clastic composition of the Huagang Formation in the north-central part of the central inversion tectonic belt in the Xihu sag.

Sublayer Depth/m Q1/% F1/% R1/% Q1/(F1+R1) F1/R1 Number of samples H3 3 245 63.5 16.8 19.7 1.74 0.86 541 H4 3 459 64.8 16.6 18.6 1.84 0.89 414 H5 3 615 64.9 16.4 18.7 1.85 0.87 110 H6 3 874 64.0 16.7 19.3 1.77 0.87 122 H7 4 334 65.3 16.2 18.6 1.88 0.87 87 Average 3 705 64.5 16.5 19.0 1.80 0.87 1274*