普光气田飞仙关组储集层裂缝特征及期次  

Fracture Characteristics and Formation Period of Feixianguan Reservoir in Puguang Gas Field

作　　者：张冲[1] 刘鸿博[1,2] 姚勇[1] 谢润成[1,3] 周文[1,3] 巩高飞[1] 

机构地区：[1]成都理工大学能源学院,成都610059 [2]四川水利职业技术学院,四川都江堰611830 [3]成都理工大学油气藏地质及开发工程国家重点实验室,成都610059

出　　处：《新疆石油地质》2014年第5期521-525,共5页Xinjiang Petroleum Geology

基　　金：国家自然科学基金(41202096)

摘　　要：为查明普光气田下三叠统飞仙关组一段和二段鲕粒白云岩储集层裂缝特征和形成期次,对岩心、薄片中的裂缝基本特征,包括裂缝产状、充填程度、参数和张开度等,进行了详细描述和统计分析。采用古地磁薄片定向技术,分析了裂缝的组系和方向,认为北东东—南西西向为裂缝优势组系,而不同组系的裂缝反映了地层曾受到多期的构造运动。根据岩心裂缝的切割限制关系、铱含量及裂缝充填物碳氧同位素等,确定了裂缝形成期次为3期,即印支运动晚期(次要)、燕山运动期(裂缝主要形成期)、燕山运动晚期—喜马拉雅运动期(现今有效裂缝主要形成期)。对裂缝特征及裂缝期次的研究,可为目的层地质模型建立、油气成藏等研究提供重要地质信息。In order to definitely understand the fracture characteristic and formation period in oolitic dolomite reservoir of Feixianguan No.1 and No.2 members of Lower Triassic in Puguang gas field,this paper presents detailed description and statistical analysis of the fractures of cores and thin-section,including the fractural occurrence,pack density and fracture opening,etc.,and discusses the fractural group system and direction using paleomagnetic thin-section orientation technology.It is suggested that the NEE-SWW direction is the advantageous group system,while the fractures of different group systems reflect that the strata may undergo multistage tectonic activities.Based on the fracture cutting limit matching relationship,the iridium content and the filling carbon and oxygen isotopes,it is determined that there exist three periods of fracture formation,such as Late Indosinian period （the secondary formation period）,Yanshan period （the major formation period）and Late Yanshan-Himalayan period （the effective fractures major formation period nowadays）.Such a study can provide the important geological information for geological modeling and oil-gas accumulation of target zones in this area.

关 键 词：普光气田 飞仙关组 裂缝特征 裂缝期次 古地磁 碳同位素 氧同位素 铱含量 

分 类 号：TE112.23[石油与天然气工程—油气勘探]