渤海湾盆地东濮凹陷潜山油气成藏模式

doi:10.11743/ogg20250206

Abstract

Abstract:

The hydrocarbon supply modes and accumulation processes of buried hills are yet to be clarified in the Dongpu Sag， Bohai Bay Basin. In this regard， we systematically classify the buried hills based on their morphologies and internal structures. In combination with the developmental characteristics of source rocks and the source rock-reservoir contact relationships， we determine the hydrocarbon supply modes of various buried hills， as well as the controlling effects of the fault-sand body-unconformity carrier system on the hydrocarbon accumulation process. Accordingly， the hydrocarbon enrichment and accumulation patterns of buried hills in the Dongpu Sag are proposed. The results indicate that the Dongpu Sag exhibits three buried-hill morphologies： residual， fault-block， and decollement. These hills can be categorized into five types based on their internal structures， namely monoclinal-residual， folded-residual， monoclinal-fault-block， folded fault-block， and monoclinal-decollement buried hills， with the monoclinal-fault-block type predominating. Hydrocarbon reservoirs therein are primarily supplied by two suites of source rocks， unidirectionally or bidirectionally. Hydrocarbon charging occurs principally through five supply modes： stepped， bridging， lateral-contact， full-contact， and cutting-through. Therefore， the hydrocarbon migration efficiency and accumulation processes in these buried hills are under the action of diverse hydrocarbon transport conditions. The differential hydrocarbon migration and accumulation in fault-block buried hills are primarily governed by the vertical transport capacity of faults， lateral transport capacity of sandstones， and the lateral sealing performance of faults. In addition， for hydrocarbon accumulation near the unconformities in the buried hills， the transport capacity of the unconformities represents a key controlling factor， determining the locations of hydrocarbon enrichment and the scales of hydrocarbon reservoirs. The differential hydrocarbon accumulation in the buried hills is attributed primarily to the differences in hydrocarbon supply modes and transport conditions. Specifically， the compressional-tensile folded-block-block buried hills， receiving bidirectional hydrocarbon supply through full contact and bridging， exhibit the most significant hydrocarbon enrichment. In contrast， the erosional monoclinal-residual buried hills with unidirectional， stepped hydrocarbon supply display a relatively low degree of hydrocarbon enrichment.

Key words: enrichment and accumulation, hydrocarbon supply mode, hydrocarbon transport condition, quantitative assessment, hydrocarbon reservoir, buried hill, Dongpu Sag, Bohai Bay Basin

CLC Number:

TE122.3

Zhuoyi LI, Min XIE. Hydrocarbon accumulation models of buried hills in the Dongpu Sag， Bohai Bay Basin[J]. Oil & Gas Geology, 2025, 46(2): 407-426.

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Hydrocarbon accumulation models of buried hills in the Dongpu Sag， Bohai Bay Basin

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