阿姆河盆地查尔朱阶地及邻区盐相关断裂特征与油气地质意义

doi:10.11743/ogg20130613

Abstract

Abstract: A set of salt-gypsum rocks occur in the Upper Jurassic in Zarzhu terrace and its adjacent areas in the Amu Darya Basin,making fault and their combination types complicated,thus being of great significance for petroleum exploration.Through the analysis of the drilling data and seismic data,we studied the development characteristics of salt-related faults and their control on hydrocarbon accumulation.The results show that there are two fault systems in the pre-salt layer and above-salt layer in the study area respectively.They appear in 3 combination styles,i.e.thrust fault in above-salt layer-thrust fault in pre-salt layer,strike-slip in above-salt layer-thrust fault in pre-salt layer,and strike-slip-basement involvement in above-salt layer.The salt-related faults are controlled by tectonic stress field,pre-existing basement faults and thickness of salt-gypsum rocks.In the east part of the study area,where the salt-gypsum rock is thick,there develops two fault combination styles,i.e.strike-slip in above-salt layer-thrust fault in pre-salt layer,and thrust fault in above-salt layer-thrust fault in pre-salt layer.The faults provide trap conditions for hydrocarbon accumulation and do not destroy the sealing integrity of the salt-gypsum rock.While in the west part of the study area,where the salt-gypsum rock is thin and the compress is weak,there develops strike-slip-basement involvement in above-salt layer.The development of faults were controlled by the basement fault,and is destructive to the accumulation of oil and gas in pre-salt layers.

Key words: salt-related fault, salt-gypsum cap rock, hydrocarbon accumulation, Zarzhu terrace, Amu Darya Basin

CLC Number:

TE122.2

Nie Minglong, Wu lei, Sun lin, Gao Anhu. Salt-related fault characteristics and their petroleum geological significance in Zarzhu terrace and its adjacent areas, the Amu Darya Basin[J]. Oil & Gas Geology, 2013, 34(6): 803-808.

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Salt-related fault characteristics and their petroleum geological significance in Zarzhu terrace and its adjacent areas, the Amu Darya Basin

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