New indicators from bedding-parallel beef veins for the fault valve   mechanism

doi:10.1007/s11430-015-5086-6

CORC > 北京大学 > 地球与空间科学学院

	New indicators from bedding-parallel beef veins for the fault valve mechanism
	Zhang Bo ; Yin CongYuan ; Gu ZhiDong ; Zhang JinJiang ; Yan ShuYu ; Wang Yang
刊名	SCIENCE CHINA-EARTH SCIENCES
	2015
关键词	calcite vein beef structure crack-seal slip EBSD carbonate rock Sichuan Basin CRYSTALLOGRAPHIC PREFERRED ORIENTATION SOUTH CHINA CRACK-SEAL DYNAMIC RECRYSTALLIZATION DEFORMATION MECHANISMS PRECIPITATION CREEP PRESSURE SOLUTION CALCITE MARBLE FIBROUS VEINS SICHUAN BASIN
DOI	10.1007/s11430-015-5086-6
英文摘要	Beef structures (bedding-parallel veins of fibrous calcite) are widespread within the Lower Triassic carbonate rocks in the Sichuan Basin of China, especially within clay-rich strata of low permeability. In the veins, fibrous calcite occurs in the outer zones, and coarse equant calcite in the inner zones. At least two generations of calcite crystallization took place during aqueous alteration, at the same time as deformation recorded by the calcite. The first-generation calcite fibers are at steep angles to the hydrocarbon-bearing host beds, and they grew vertically against the force of gravity at a time when the source rocks were maturing. Second-generation calcite occurs as coarse equant grains that sealed pores via localized fluid flow during horizontal tectonic compression, so that shear stresses acted at the fracture margins. Shearing of the host rock was accommodated in part by dissolution-precipitation creep (DPC), grain rotation, and grain slippage, recorded in crystallographic preferred orientations (CPOs) of the host calcite grains beside the crack walls. The beef veins formed during high pore-fluid overpressures along hydrofractures. We propose that the bedding-parallel veins with beef structures are evidence of a "crack-seal slip" fault valve process during hydrocarbon generation. The hydrocarbon-bearing calcite beef structure may be a good indicator of oil or gas migration, and of the flow direction of aqueous solutions.; National Natural Science Foundation of China [41272217, 41422206]; China National Petroleum Corporation (CNPC); SCI(E); EI; 中国科学引文数据库(CSCD); ARTICLE; geozhangbo@pku.edu.cn; 8; 1320-1336; 58
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/414444]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhang Bo,Yin CongYuan,Gu ZhiDong,et al. New indicators from bedding-parallel beef veins for the fault valve mechanism[J]. SCIENCE CHINA-EARTH SCIENCES,2015.
APA	Zhang Bo,Yin CongYuan,Gu ZhiDong,Zhang JinJiang,Yan ShuYu,&Wang Yang.(2015).New indicators from bedding-parallel beef veins for the fault valve mechanism.SCIENCE CHINA-EARTH SCIENCES.
MLA	Zhang Bo,et al."New indicators from bedding-parallel beef veins for the fault valve mechanism".SCIENCE CHINA-EARTH SCIENCES (2015).