Main controlling factors of high-quality Mesozoic volcanic rock reservoirs in the Structure 428 of Bozhong Sag

The Mesozoic volcanic rocks, characterized by sharp lithological change, strong reservoir heterogeneity and variable controlling factors, are widely distributed in the Bohai Bay basin. In order to explore the controlling factors of the high-quality volcanic reservoirs, cores, thin sections and laboratory testing data are fully used to reveal lithological characteristics, reservoir space characteristics so as to clarify the controlling factors of the volcanic reservoirs. The data shows that the volcanic rocks in the study area are mainly composed of andesite, basalt, volcanic breccia and tuff, and the reservoir space is dominated by dissolution pores and fractures. The high-quality volcanic reservoirs are mainly controlled by lithology, lithofacies, cyclic interface and structural displacement and deformation. Lithology and lithofacies control the longitudinal distribution of high-quality volcanic reservoirs, cyclic interface controls the vertical distribution of high-quality volcanic reservoirs, and structural displacement and deformation control the reformation of the reservoirs in later stages.