Journal of Petroleum Science and Engineering | 2019
Reservoir controlling factors of the Paleogene Oligocene Huagang Formation in the north central part of the Xihu Depression, East China Sea Basin, China
Abstract
Abstract Huagang Formation is a typical offshore, deep, low-permeability, tight sandstone reservoir with a low level of exploration and development and unclear control factors in the North Central area of the Xihu Depression in the East China Sea Basin. In this paper, we begin with the analysis of basic data, such as cores, casting thin sections, cathode luminescence, scanning electron microscopy, physical property statistics, grain size analysis, mercury penetration and magnetic resonance imaging, combined with field logging data from conventional logging, imaging logging and three-dimensional seismic imagery. The reservoir s physical properties were comprehensively discussed in terms of provenance, deposition, diagenesis and fractures. The results showed that the reservoir physical properties of the Huagang Formation were mainly affected by compaction, and the porosity and permeability decreased with the depth of burial. When the depth exceeds 4000\u202fm, the porosity is basically