Development characteristics of the unconformity on the bottom Paleogene in the northern Bozhong Sag and its relationship with hydrocarbon accumulation

CHEN Yuhang; ZHANG Xintao; YU Yixin; YANG Fan; LIU Yongjun; ZHANG Zhen; GE Daoyao; DU Qirui

doi:10.16562/j.cnki.0256-1492.2022050301

Marine Geology & Quaternary Geology > 2023 > 43(2): 170-180. > DOI: 10.16562/j.cnki.0256-1492.2022050301

CHEN Yuhang，ZHANG Xintao，YU Yixin，et al. Development characteristics of the unconformity on the bottom Paleogene in the northern Bozhong Sag and its relationship with hydrocarbon accumulation[J]. Marine Geology & Quaternary Geology，2023，43(2)：170-180. DOI: 10.16562/j.cnki.0256-1492.2022050301

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Development characteristics of the unconformity on the bottom Paleogene in the northern Bozhong Sag and its relationship with hydrocarbon accumulation

CHEN Yuhang^1,2,3,,
ZHANG Xintao⁴,
YU Yixin^1,2, ,,
YANG Fan^1,2,
LIU Yongjun⁵,
ZHANG Zhen⁵,
GE Daoyao^1,2,
DU Qirui^1,2

1.
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
2.
College of Geosciences, China University of Petroleum, Beijing 102249, China
3.
Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi´an 710018, China
4.
Development and Production Department of CNOOC Ltd., Beijing 100010, China
5.
CNOOC Tianjin Branch, Tianjin 300459, China

More Information

Received Date: May 02, 2022
Revised Date: May 18, 2022
Accepted Date: May 18, 2022
Available Online: June 08, 2022

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Abstract

Abstract

Unconformity is an important part of hydrocarbon migration system and a favorable place for hydrocarbon accumulation. Taking the northern Bozhong Sag in Bohai Bay Basin as an example, we analyzed the characteristics of unconformity development on bottom Paleogene and its influence on hydrocarbon accumulation comprehensively by using the data from 3D seismic, drilling and logging, and core thin-section. Results show that there are five contact types and seven structural types of the Paleogene bottom unconformity in the northern Bozhong Sag. Unconformity channel types can be divided into double migration channel type Ⅰ, single migration channel type Ⅱ₁ and Ⅱ₂ and plugging type Ⅲ. The single migration channel type Ⅱ₁ is the main type of unconformity hydrocarbon accumulation in the study area. The migration and accumulation types include lateral type, trap and lateral type, vertical and lateral type, and plugging type. The hydrocarbon migration capacity of sandstone above the unconformity is related to the microscopic characteristics of sandstone and the dip angle of fracture. The hydrocarbon migration and storage capacity of semi-weathered rock strata are controlled by the volcanic rocks with good original porosity and permeability and difficult to form weathered clay layer.
- unconformity,
- hydrocarbon accumulation,
- volcanic rock,
- Bohai Bay Basin,
- northern Bozhong sag

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References (28)

References

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