渤海海域辽西构造带S型走滑转换带特征及控藏作用定量表征

doi:10.11743/ogg20180103

Abstract

Abstract: S-shaped strike-slip transfer zone is widely developed structure in strike-slip strain background.However, previous researches are mainly focused on the classification of strike-slip transfer zones, but its control on hydrocarbon accumulation is poorly understood.Based on 3D seismic data and oil and gas fields analysis, this paper addresses the effects of S-shaped strike-slip transfer zone on hydrocarbon accumulation in the Liaoxi structural belt, Bohai Sea, by using statistical methods.Cenozoic structural deformation of the Liaoxi structural belt is characterized by deformation of NE-trending extension superimposed by NEE-trending dextral strike-slip activities.S-shaped strike-slip transfer zone can be divided into restraining bends and releasing bends.According to different evolution stages, restraining bends can be further divided into 3 subordinate classes, involving transpressional uplifting bend, gentle restraining bend and intense restraining bend.Similarly, releasing bends involve spindle-shaped pull-apart, lazy s-shaped pull-apart and rhomboidal pull-apart.In addition, the strike-slip transfer zones at the end of strike-slip fault zones contain restraining and releasing horsetails.The concept of oil and gas enrichment index (OGEI) is defined, and the positive correlation between master strike-slip fault curvature and intensity of adjusting strike-slip faults is proven.A mathematical model from OGEI is proposed to quantitatively predict oil and gas enrichment.It is a quantitative tool for exploration decision, and has been applied in analysis of LD5-2N oil field successfully.

Key words: oil and gas enrichment index, strike-slip structure, S-shaped strike-slip transfer zone, Liaoxi structural belt, Tanlu fault zone, Bohai Sea

CLC Number:

TE121.2

Liu Yubo, Huang Xiaobo, Xu Changgui, Li Qiang, Wu Kui, Yu Yixin, Zhang Rucai. Characteristics of S-shaped strike-slip transfer zones and quantitative analysis of their influence on hydrocarbon accumulation in Liaoxi structural belt, Bohai Sea[J]. Oil & Gas Geology, 2018, 39(1): 20-29.

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Characteristics of S-shaped strike-slip transfer zones and quantitative analysis of their influence on hydrocarbon accumulation in Liaoxi structural belt, Bohai Sea

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