Origin and migration of brines from Paleozoic strata in Central Tarim, China: constraints from Sr-87/Sr-86, delta D, delta O-18 and water chemistry

	Origin and migration of brines from Paleozoic strata in Central Tarim, China: constraints from Sr-87/Sr-86, delta D, delta O-18 and water chemistry
	Cai, CF ; Franks, SG ; Aagaard, P
刊名	APPLIED GEOCHEMISTRY
	2001-07-01
卷号	16 期号:9-10 页码:1269-1284
ISSN号	0883-2927
文献子类	Article
英文摘要	Chemistry of major and minor elements, Sr-87/Sr-86, deltaD, and delta O-18 of oilfield waters, and Sr-87/Sr-86 of whole rock were measured from Paleozoic strata in the Central Tarim basin, NW China. The aim is to elucidate the origin and migration of formation water and its relation to petroleum migration. High salinity oilfield waters in Carboniferous, Silurian and Ordovician reservoirs have maintained the same Na/Cl ratio as seawater, indicative of subaerially evaporated seawater. Two possible sources of evaporitic water are Carboniferous (C-u) and Cambrian, both of which contain evaporitic sediments. Geographic and stratigraphic trends in water chemistry suggest that most of the high salinity water is from the Cambrian. Strontium, H and O isotopes as well as ion chemistry indicate at least 3 end member waters in the basin. High-salinity Cambrian evaporitic water was expelled upward into Ordovician, Silurian and Carboniferous reservoirs along faults and fractures during compaction and burial. Meteoric water has likely invaded the section throughout its history as uplift created subaerial unconformities. Meteoric water certainly infiltrated Silurian and older strata during development of the C-III unconformity and again in recent times. Modern meteoric water enters Carboniferous strata from the west and flows eastward, mixing with the high salinity Cambrian water and to a lesser degree with paleometeoric water. The third rad member is highly radiogenic, shale-derived water which has migrated eastward from the Awati Depression to the weal. Enrichment of Ca and Sr and depletion of K, Mg, and SO4 relative to the seawater evaporation trajectory suggest waters were affected by albitization of feldspars, dolomitization, illitization of smectite, and SO4 reduction. The mixing of meteoric water occurred subsequently to seawater evaporation, main water-rock interactions, and brine migration. The direction of brine migration is consistent with that of petroleum migration, suggesting water and petroleum have followed the same migration pathways. (C) 2001 Elsevier Science Ltd. All rights reserved.
WOS关键词	SALINE FORMATION WATERS ; SEDIMENTARY BASIN ; ISOTOPE GEOCHEMISTRY ; MICHIGAN BASIN ; USA ; STRONTIUM ; EVOLUTION ; HISTORY
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000168492800022
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/77235]
专题	中国科学院地质与地球物理研究所
通讯作者	Cai, CF
作者单位	1.CAS, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Rock Fluid Syst Inc, Plano, TX 75023 USA 3.Univ Oslo, Dept Geol, N-0316 Oslo, Norway
推荐引用方式 GB/T 7714	Cai, CF,Franks, SG,Aagaard, P. Origin and migration of brines from Paleozoic strata in Central Tarim, China: constraints from Sr-87/Sr-86, delta D, delta O-18 and water chemistry[J]. APPLIED GEOCHEMISTRY,2001,16(9-10):1269-1284.
APA	Cai, CF,Franks, SG,&Aagaard, P.(2001).Origin and migration of brines from Paleozoic strata in Central Tarim, China: constraints from Sr-87/Sr-86, delta D, delta O-18 and water chemistry.APPLIED GEOCHEMISTRY,16(9-10),1269-1284.
MLA	Cai, CF,et al."Origin and migration of brines from Paleozoic strata in Central Tarim, China: constraints from Sr-87/Sr-86, delta D, delta O-18 and water chemistry".APPLIED GEOCHEMISTRY 16.9-10(2001):1269-1284.