Fracture development and hydrocarbon accumulation in tight sandstone reservoirs of the Paleogene Huagang Formation in the central reversal tectonic belt of the Xihu Sag, East China Sea

ZHOU Xinhuai,XU Guosheng,CUI Hengyuan,ZHANG Wu

Fig. 2 Typical core fracture types in the Huagang Formation. (A) Well A-2, 3619.25-3619.30 m, interlayer fractures; (b) Well B-1, 3866.50-3866.56 m, shrinkage fractures; (c) Well E-1, 4649.07-4649.74 m, tectonic fractures; (d) Well B-2, 4247.85-4248.30 m, tectonic fractures.