Stratigraphic Boundaries in the Mesozoic Volcanic Rocks in the Bohai Bay Basin: Types and Influence on Reservoirs

doi:10.7657/XJPG20260405

Abstract

Abstract:

Volcanic rock reservoirs are complex in distribution, and especially the relationship between volcanic rock stratigraphic boundary and reservoir distribution remains unclear. Based on the data of field volcanic edifice sections, drilling, logging, elements, and thin sections, the stratigraphic boundaries in the Mesozoic volcanic rocks in the Bohai Bay Basin were identified, and their types and characteristics were clarified, and the influence of these stratigraphic boundaries on reservoirs was investigated. The results indicate that long-term, medium-term, and short-term exposed stratigraphic boundaries associated with eruptive unconformity are identified in the Mesozoic volcanic rocks in the Bohai Bay Basin. The long-term exposed stratigraphic boundaries reflect obvious angular unconformities in seismic data. In contrast, the medium-term and short-term ones exhibit remarkable signatures on electrical and elemental logs due to the presence of sedimentary interlayers and thin weathering crusts. These signatures are mainly manifested in decreased resistivity, lower density, increased acoustic travel time, and higher neutron porosity near the stratigraphic boundaries, as well as gradual increases in contents of elements such as Ca, Ti, Fe, Mg, P, and Mn. The stratigraphic boundaries exert differential control on volcanic rock reservoirs. Specifically, the long-term exposed stratigraphic boundaries control the weathering crust reservoirs (mostly 150-300 m thick) at the top of buried hills; below the medium-term exposed stratigraphic boundaries, intra-buried-hill reservoirs with thickness of 30-50 m are found; and beneath the short-term exposed stratigraphic boundaries, there are intra-buried-hill reservoirs, with thickness of 10 m or up to 50 m individually. A model of reservoir development controlled by 3 stratigraphic boundaries was established. It is recognized that the volcanic rock reservoir exhibit a multi-layered stacking architecture. The study provides a basis for the shift of exploration from weathering crust at the top of buried hills to reservoirs within buried hills.

Key words: Bohai Bay Basin, Mesozoic, volcanic rock, reservoir, stratigraphic boundary, buried hill, weathering crust, development model

CLC Number:

TE122.2

WANG Liying, WANG Jiage, HUANG Feifei, WANG Fang. Stratigraphic Boundaries in the Mesozoic Volcanic Rocks in the Bohai Bay Basin: Types and Influence on Reservoirs[J]. Xinjiang Petroleum Geology, 2026, 47(4): 425-434.

Figures/Tables 10

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