CHARACTERISTICS OF THE CENOZOIC CAP ROCK AND ITS CONTROL ON HYDROCARBON IN THE WESTERN BOHAI SEA AREA

ZHANG Zhengtao; LIN Changsong; LI Huiyong; ZHANG Guokun; DAI Jianglin

doi:10.12090/j.issn.1006-6616.2019.25.03.033

Volume 25 Issue 3

Jun. 2019

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ZHANG Zhengtao, LIN Changsong, LI Huiyong, et al., 2019. CHARACTERISTICS OF THE CENOZOIC CAP ROCK AND ITS CONTROL ON HYDROCARBON IN THE WESTERN BOHAI SEA AREA. Journal of Geomechanics, 25 (3): 357-369. DOI: 10.12090/j.issn.1006-6616.2019.25.03.033

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CHARACTERISTICS OF THE CENOZOIC CAP ROCK AND ITS CONTROL ON HYDROCARBON IN THE WESTERN BOHAI SEA AREA

doi: 10.12090/j.issn.1006-6616.2019.25.03.033

1.
School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China
2.
School of Ocean Sciences, China University of Geosciences(Beijing), Beijing 100083, China
3.
Tianjin Branch, China National Offshore Oil Corporation, Tianjin 300452, China

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Received: 2018-05-03
Revised: 2019-01-26
Published: 2019-06-01

Abstract

Abstract

The development of the Cenozoic cap rock in the western Bohai sea area is closely related to hydrocarbon accumulation. In order to clarify the control of cap rock on hydrocarbon enrichment, based on the drilling data, logging data and coring analysis data, the development characteristics of the Cenozoic cap rock and the sealing capacity were studied in the western Bohai sea area. The results show that:three sets of regional mudstone cap rocks are recognized in the study area, which are lower second member of the Dongying Formation(E₃d^2L), lower of the lower Minghuazhen Formation(N₂m^L), and upper of the lower Minghuazhen Formation. Compared with two sets of mudstone cap rocks in N₂m^L, the mudstone cap rock in E₃d^2L has the characteristics of large thickness, dark color, pure quality, high mud-land ratio, more stable lateral distribution and higher diagenetic stage. The mudstone cap rock of E₃d^2L has better sealing ability than the N₂m^L. Hydrocarbon accumulation and distribution in the Dongying Formation and the Shahejie Formation are controlled by E₃d^2L regional cap rock, which drives the migration of hydrocarbon toward the updip side of the Shaleitian paleo uplift. The "ultimate caprock" of N₂m^L and faults control the degree of hydrocarbon enrichment of Neogene in the western Bohai sea area. Two kinds of regional cap rock-controlled conduction modes, "the structural ridge transport system of mudstone cap rock in E₃d^2L around depression" and "the hydrocarbon migration system of mudstone cap rock and fault interaction on uplift slope and above in N₂m^L", are proposed.
- mudstone cap rock,
- sealing property,
- hydrocarbon migration and accumulation,
- Shaleitian uplift,
- western Bohai Sea area

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CHARACTERISTICS OF THE CENOZOIC CAP ROCK AND ITS CONTROL ON HYDROCARBON IN THE WESTERN BOHAI SEA AREA

doi: 10.12090/j.issn.1006-6616.2019.25.03.033

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CHARACTERISTICS OF THE CENOZOIC CAP ROCK AND ITS CONTROL ON HYDROCARBON IN THE WESTERN BOHAI SEA AREA

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