川东北元坝气田长兴组白云岩成因研究

CORC > 北京大学 > 地球与空间科学学院

	川东北元坝气田长兴组白云岩成因研究; Dolomitization of the Upper Permian Changxing Formation in Yuanba gas field, NE Sichuan Basin, China
	田永净 ; 马永生 ; 刘波 ; 张学丰 ; 刘建强 ; 石开波 ; 吴双林
刊名	岩石学报
	2014
关键词	长兴组礁滩相地球化学浅埋藏白云岩化元坝川东北 Changxing Formation Reef-shoal Facies Geochemistry Shallow Burial Dolomitization Yuanba NE Sichuan
英文摘要	上二叠统长兴组礁滩相白云岩是川东北元坝气田的主要储层。长兴组白云岩主要分布在长二段顶部礁盖、礁间滩、礁后滩等沉积相。通过层序地层学、岩石学、地球化学等方法对白云岩成因进行了研究,结果表明:不同类型的白云岩具有相似的87Sr/86Sr值(集中分布在0.7071~0.7075之间),并与晚二叠世海水及泥晶灰岩87Sr/86Sr值相似,指示白云岩化流体主要来自于同期海水;利用低温条件下白云石-水之间氧同位素温度分馏方程恢复的白云岩化流体温度在40~55℃之间,表明白云岩化作用发生于低温浅埋藏环境中。在浅埋藏白云岩化过程中,受沉积地貌和海平面升降的影响,不同沉积相带发生白云岩化作用时流体的性质有所不同...; Reef-shoal dolomite is the main reservoir of the Upper Permian Changxing Formation in Yuanba gas field, NE Sichuan Basin, south of China. The dolomite mainly developed in upper part of the Second Member of Changxing Formation, whose sedimentary facies include reef cap facie, inter-reef shoal facie and back reef shoal facie, etc. Different types of dolomites have similar ratios of Sr-87/Sr-86 (range from 0.7071 to 0.7075), which are consistent with the Late Permian seawater and micritic limestone, indicating dolomitizing fluids mainly came from contemporaneous seawater. Dolomitization occurred in a shallow burial low-temperature environment judged from the dolomitizing fluids temperature (40 similar to 55 degrees C) which is calculated from oxygen isotope dolomite-water fractionation equation at low temperature. Even in an open-flow environment, affected by the palaeogeomorphology and the sea-level fluctuations, different sedimentary facies influenced by various dolomitization fluids. (1) Relict bioclast medium-coarse crystalline reef cap dolomite has obviously negative delta O-18, high Fe, Mn and slow crystal formation characteristics, suggesting the mixture of meteoric water and seawater involved in the reef cap dolomitization. (2) Microcrystal dolomite of inter-reef shoal has high delta O-18, significantly high Fe, Mn, Sr and low order degree. Although the data indicates complex dolomitization fluid sources, it is closely related to the evaporated brines. (3) Finely-medium crystalline dolomite of back reef (or shoal) has the characteristics of very low Fe, Mn value and high content of MgCO3, together with the rapid crystal formation, indicating a dolomitization under normal sea water condition.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000343530900024&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 0; tyongjing@163.com; 09; 2766-2776; 30
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/208899]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	田永净,马永生,刘波,等. 川东北元坝气田长兴组白云岩成因研究, Dolomitization of the Upper Permian Changxing Formation in Yuanba gas field, NE Sichuan Basin, China[J]. 岩石学报,2014.
APA	田永净.,马永生.,刘波.,张学丰.,刘建强.,...&吴双林.(2014).川东北元坝气田长兴组白云岩成因研究.岩石学报.
MLA	田永净,et al."川东北元坝气田长兴组白云岩成因研究".岩石学报 (2014).