柴达木盆地英雄岭南带断裂活动特征及其控藏作用

doi:10.12108/yxyqc.20210115

Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (1): 161-174.doi: 10.12108/yxyqc.20210115

• PETROLEUM GEOLOGY • Previous Articles Next Articles

Characteristics of fault activity and its control on hydrocarbon accumulation in southern Yingxiongling area,Qaidam Basin

LU Enjun^1,2,3, LIU Shaobo^1,2,3, YU Zhichao^1,2,3, LU Xuesong^1,2,3, CHENG Dingshu⁴

1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
2. State Key Laboratory of Enhanced Oil Recovery, Beijing 100083, China;
3. Key Laboratory of Basin Structure and Hydrocarbon Accumulation, CNPC, Beijing 100083, China;
4. Research Institute Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China

Received:2020-02-20 Revised:2020-06-29 Online:2021-02-01 Published:2021-01-25

Abstract

Abstract: Faults are widely distributed in southern Yingxiongling area,Qaidam Basin. The control of the faults on hydrocarbon accumulation is unclear. Through reinterpretation of seismic profiles in this area,five main faults were analyzed:Shizigou fault,Ⅰ fault,Ⅱ fault,Youshashan fault and Ⅺ fault. The fault grade,structural style, activity intensity and evolution process were studied,and the control effect of faults on hydrocarbon accumulation was discussed by analyzing the characteristics of biomarkers and oil and gas filling periods in southern Yingxiongling area. The results show that:(1)Ⅰ,Ⅱ and Ⅺ faults belong to the faults under the weak layer (gypsum salt rock + mudstone)and formed in Paleogene,among which Ⅱ fault and Ⅺ fault were formed by superposition of multiple faults,while Shizigou and Youshashan faults belong to faults above the weak layer,and be formed by single fault growth in Neogene.(2)Oil and gas in shallow structural belt are the result of upward migration of deep oil and gas. The activity of reservoir controlling faults matches with hydrocarbon generation period and the formation period of traps.(3)The evolution of the fault-controlling reservoir model can be divided into three stages:basement faults control the formation of source rocks in the upper Xiaganchaigou Formation;detachment faults control the accumulation of low-mature oil and gas reservoirs in the lower Youshashan Formation. detachment faults control mature hydrocarbon accumulation in the upper Youshashan Formation,and reform the early low mature oil and gas reservoirs. The difference of different fault activity characteristics is one of the main controlling factors for the difference of hydrocarbon accumulation in southern Yingxiongling area.

Key words: fault activity, hydrocarbon accumulation, structural evolution, accumulation stage, southern Yingxiongling area

CLC Number:

TE122.3

LU Enjun, LIU Shaobo, YU Zhichao, LU Xuesong, CHENG Dingshu. Characteristics of fault activity and its control on hydrocarbon accumulation in southern Yingxiongling area,Qaidam Basin[J].Lithologic Reservoirs, 2021, 33(1): 161-174.

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Characteristics of fault activity and its control on hydrocarbon accumulation in southern Yingxiongling area,Qaidam Basin

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