Tight sandstone reservoir characteristics and main controlling factors of Jurassic Lianggaoshan Formation in Fuxing area, Sichuan Basin

Abstract

The tight sandstone reservoir of Jurassic Lianggaoshan Formation in Fuxing area, Sichuan Basin has shown good exploration potential recently. Represented by wells X and Z, the tested industrial oil and gas flows have been obtained. In order to further understand the development characteristics and control factors of tight sandstone reservoirs of Jurassic Lianggaoshan Formation in the Fuxing area, through core observation, ordinary thin section identification, scanning electron microscope observation and multiple test results, the target layer in the study area is analyzed in detail. The results reveal that the tight sandstone reservoir of Lianggaoshan Formation is generally characterized by low porosity and low permeability, and the reservoir space is dominated by inorganic pores with a pore radius of 10-50 μm. Throat width is 2-10 μm。According to the influence of different diagenesis on reservoir physical properties, compaction and partial cementation are classified as destructive diagenesis, while dissolution, tectonism and cementation with chlorite cementation are divided into constructive diagenesis. This study makes clear that the subaqueous distributary channels of the delta front is the most favorable to the development of Lianggaoshan Formation sandstone reservoir. The cementation with dissolution, tectonism and chlorite cementation can improve the physical properties of Lianggaoshan Formation tight sandstone reservoir.

Keywords

• lianggaoshan formation
• tight sandstone
• sedimentation
• diagenesis
• high-quality reservoir
• sichuan basin