渤海湾盆地枣园油田古近系孔店组沸石矿物的岩浆热液成因  

Magmatic hydrothermal fluid genesis of zeolite in the Paleogene Kongdian Formation of Zaoyuan oilfield, Bohai Bay Basin, China

作　　者：韩国猛[1] 王丽 肖敦清[1] 楼达[1] 徐牧月 赵勇刚[1] 裴眼路[1] 郭小文[2] 滕建成 韩元佳[2] HAN Guomeng;WANG Li;XIAO Dunqing;LOU Da;XU Muyue;ZHAO Yonggang;PEI Yanlu;GUO Xiaowen;TENG Jiancheng;HAN Yuanjia(PetroChina Dagang Oilfield Company,Tianjin 300280,China;Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education,China University of Geosciences(Wuhan),Wuhan 430074,China;School of Earth Sciences,China University of Geosciences(Wuhan),Wuhan 430074,China)

机构地区：[1]中国石油大港油田公司勘探开发研究院,天津300280 [2]中国地质大学(武汉)构造与油气资源教育部重点实验室,武汉430074 [3]中国地质大学(武汉)地球科学学院,武汉430074

出　　处：《石油勘探与开发》2021年第5期950-961,共12页Petroleum Exploration and Development

基　　金：中国石油大港油田公司“大港探区火成岩分布及储层预测研究”项目(DGTY-2018-JS-408);国家自然科学基金“盆地深部地质作用过程与资源效应”项目(U20B6001)。

摘　　要：通过普通薄片、电子探针、包裹体测温、激光拉曼光谱、激光剥蚀电感耦合等离子体质谱等技术分析手段,对渤海湾盆地枣园油田Z56井古近系孔店组二段(简称孔二段)热液流体活动进行识别,并探讨岩浆热液流体与孔二段沸石矿物的成因联系。实验发现:(1)泥岩裂缝内可见焦沥青与绿泥石、重晶石、黄铜矿、黄铁矿、钠沸石、方沸石等热液特征矿物共生;(2)焦沥青激光拉曼光谱的分峰拟合计算温度为324~354℃,绿泥石地质温度计指示温度为124~166℃,钠沸石原生包裹体均一温度为89~196℃,反映了岩浆热液流体的温度变化较大,但是都高于正常地温;(3)绿泥石和重晶石的铕正异常明显,钠沸石的稀土元素配分曲线与孔店组玄武岩相似,指示其来源于岩浆热液流体。同时,钻井资料显示,Z56井孔二段发育多套玄武岩夹层,具备岩浆热液活动的地质基础。因此,岩浆热液流体与孔二段泥岩之间的水-岩相互作用可能是导致研究区孔二段泥岩富含沸石矿物的原因之一。图9表3参48。Electronic probe, fluid inclusion homogenization temperature, Raman spectroscopy and laser ablation inductively coupled plasma mass spectrometry were utilized to identify the hydrothermal fluid-rock interactions in the second member of the Paleogene Kongdian Formation of Zaoyuan oilfield in Bohai Bay Basin(Kong 2 Member for short) of Well Z56 to find out the relationship between zeolite and hydrothermal fluid. The experimental results show that:(1) Pyrobitumen coexists with hydrothermal fluid characteristic minerals such as chlorite, barite, chalcopyrite, pyrite, natrolite and analcime in mudstone fractures.(2) The temperatures calculated from laser Raman spectrum of pyrobitumen, from the chlorite geothermometer and from measured homogenization temperature of natrolite inclusions are 324-354 ℃, 124-166 ℃ and 89-196 ℃, respectively;although vary widely, all the temperatures are obviously higher than the normal geothermal temperature.(3) The positive Eu anomaly of chlorite and barite, and the similar distribution pattern in rare earth elements between natrolite and basalt indicate they are from magmatic hydrothermal fluid. Moreover, drilling data shows that the Kong 2 Member in Well Z56 has several sets of basalt interlayers, suggesting there was geologic base of magmatic hydrothermal fluid activity. The magmatic hydrothermal fluid-rock interaction may be one of the reasons for the abnormal enrichment of zeolite in Kong 2 Member of the Cangdong Sag.

关 键 词：古近系孔店组 岩浆热液流体 沸石 枣园油田 沧东凹陷 黄骅坳陷 渤海湾盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]