珠江口盆地惠州26洼“源-汇-聚”特征与惠州26-6大油气田发现启示

doi:10.11743/ogg20220404

Abstract

Abstract:

In the Pearl River Mouth Basin， a majority of hydrocarbons were discovered in the Miocene-Oligocene reservoir rocks deposited during the depression stage， while only 8 % of the discovered hydrocarbons were found in the Eocene reservoir rocks formed during the rifting stage， and no commercial discoveries have been made in the Mesozoic buried hills. The main problems in exploration for the Paleogene reservoir rocks and Mesozoic buried hills include whether there are a quantity of hydrocarbons still preserved in the middle-to-deep downfaulted reservoir rocks of hydrocarbon-rich sags， whether the hydrocarbon migration pathways are effectively developed in the Paleogene reservoir rocks and Mesozoic buried hills， as well as whether the hydrocarbon accumulation dynamics， traps and reservoir-seal assemblages are well developed. In line with the assessment theory of “source-migration-accumulation”， the study discusses the static and dynamic elements of the hydrocarbon accumulation system in Huizhou 26 Sag， Pearl River Mouth Basin， including the hydrocarbon source in terms of types and quality of source rocks， thermal evolution and hydrocarbon generation-expulsion history， and types and scale of hydrocarbon resources， the hydrocarbon migration in terms of migration unit and direction， migration pathway， confluence intensity， as well as the hydrocarbon accumulation in terms of secondary structural belt and trap， reservoir-seal assemblage， charging intensity and preservation condition. In conclusion， the study reveals the characteristics of source-migration-accumulation for the Paleogene reservoir rocks and Mesozoic buried hills in Huizhou 26 Sag， sets up a dynamic accumulation model featuring “accelerated maturation of oil-prone source rocks at later stages， generation of oil at first followed by gas， joint control of fault and overpressure， strong hydrocarbon supply by source-reservoir juxtaposition， and 3D migration and accumulation”. Major breakthrough has been made thereby in the exploration for the Paleogene reservoirs and Mesozoic buried hills in Huizhou 26-6 structure.

Key words: dynamic accumulation, source-migration-accumulation assessment, Mesozoic buried hill, Paleogene, Huizhou 26-6 oil/gas field, Huizhou 26 Sag, Pearl River Mouth Basin

CLC Number:

TE122.3

Hesheng Shi, Yangdong Gao, Jun Liu, Junzhang Zhu, Zulie Long, Yuling Shi. Characteristics of hydrocarbon source-migration-accumulation in Huizhou 26 Sag and implications of the major Huizhou 26-6 discovery in Pearl River Mouth Basin[J]. Oil & Gas Geology, 2022, 43(4): 777-791.

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Characteristics of hydrocarbon source-migration-accumulation in Huizhou 26 Sag and implications of the major Huizhou 26-6 discovery in Pearl River Mouth Basin

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