莺歌海盆地东方区中深层天然气地球化学特征与成因  

Geochemical Characteristics and Origin Types of Mid-Deep Natural Gas in Dongfang Area,Yinggehai Basin

作　　者：童传新[1,2] 马剑[3] 裴健翔 徐新德 刘平 

机构地区：[1]中国地质大学资源学院,武汉430074 [2]中海石油湛江分公司,广东湛江524057 [3]中国石油大学地球科学学院,北京102249

出　　处：《新疆石油地质》2015年第3期258-263,共6页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2011ZX05023-004-008)

摘　　要：为查明莺歌海盆地底辟带东方区中深层天然气成藏规律,在底辟活动研究成果基础上,利用天然气地球化学分析技术,对高温高压带天然气地球化学特征、分布差异及其与成藏关系进行了研究。研究结果表明:东方区高温高压带存在成熟煤型气、高成熟含混合成因CO2煤型气和高成熟富无机CO2煤型气等3种类型热成因气,其主力气源岩为中新统梅山组;底辟核部和近底辟核心区高温高压带发育多期混合充注天然气,晚期改造作用强,底辟斜坡带D13-2气田保留大量早期充注的天然气;底辟带及其周边天然气分布与充注期次和底辟活动强度密切相关。D1-1井区底辟的影响范围大约为10 km,10 km以外范围天然气品质变好,以富烷烃的天然气为主。In order to make clear the accumulation patterns of mid-deep natural gas in Dongfang area of diapir zone in Yinggehai basin,this paper studied the geochemistry,distribution of natural gas in high temperature and high pressure zone,and their relationship with gasaccumulation based on the researches of diapir activity,using the geochemical analysis technology.The results indicate that there existthree types of thermogenic gases mainly generating from Meishan formation,including the matured coal-related gas,the high-matured andCO2-bearing coal-related gas,and the high-matured and CO2-rich coal-related gas; there are multistage mixed charging natural gases inhigh temperature and high pressure zones in diaper core and near it,which are characterized by strong late reworking,and there is a largeamount of early charging gas in D13-2 gas field; such a distribution and charging period in the diapir belt and surroundings are closely re-lated to the diapir activity intensity differences.The influencing range of Diapir D1-1 is about 10 km,beyond which the quality of naturalgas is getting better,and dominated by alkane-rich gas.

关 键 词：莺歌海盆地 东方区 底辟 天然气充注 高温高压带 地球化学特征 

分 类 号：TE125[石油与天然气工程—油气勘探]