渤海湾盆地沙垒田地区新近纪走滑断裂发育特征及其对油气富集的控制作用

doi:10.11743/ogg20190408

Abstract

Abstract: Shaleitian uplift is the most abundant area for Neogene hydrocarbon accumulation in the western Bohai Sea.In order to clarify the characteristics of strike-slip fault growth and their controls on hydrocarbon accumulation, the fault types and development characteristics were described in detail using high resolution 3-D seismic and core data, and the relationship between strike-slip faults and hydrocarbon play elements was also discussed.The results show that there are three types of strike-slip faults developed in the study area, namely the basement involved strike-slip faults, caprock strike-slip faults and extensional strike-slip faults.Various types of traps are formed within or between fault zones under the influence of different types of strike-slip faults.Among others, the large-scale drape anticline, fault-nose and faulted anticline traps are favorable traps, but the small-scale fault-block traps are adverse ones.Strike-slip faults control the formation and development of skeletal sand body and fault conduit systems, which are pathways for hydrocarbon expulsion and migration from mature source rocks from adjacent sags.High-angle fractures caused by strike-slip improve reservoir qualities such as permeability.Strike-slip faults widespread in the Neogene formations are the main factors controlling hydrocarbon accumulation in the study area.

Key words: high-angle fracture, strike-slip fault, fault characteristics, trap type, hydrocarbon accumulation controlled by faults, Neogene, Shaleitian uplift, Bohai Bay Basin

CLC Number:

TE122.3

Zhang Zhengtao, Lin Changsong, Li Huiyong, Huang Zhi, Zhang Guokun. Characteristics of the Neogene strike-slip faults and their controls on hydrocarbon accumulation in Shaleitian uplift, Bohai Bay Basin[J]. Oil & Gas Geology, 2019, 40(4): 778-788.

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Characteristics of the Neogene strike-slip faults and their controls on hydrocarbon accumulation in Shaleitian uplift, Bohai Bay Basin

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