辽河盆地东部凹陷古近系玄武岩岩石学特征及其测井响应  

Petrological characteristics and logging response of Paleogene basalts in eastern depression of Liaohe Basin

作　　者：杨凯凯[1] 边伟华[1] 缴洋洋 周旭红[2] 徐琛琛[2] 卢忠琼 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]中国石油辽河油田分公司勘探开发研究院,辽宁盘锦124010 [3]中国石油华北油田二连分公司地质研究所,内蒙古锡林浩特026000

出　　处：《世界地质》2016年第1期235-243,共9页World Geology

基　　金：国家重点基础研究发展计划"973"项目(2012CB822002);国家自然科学青年基金项目(41002038);中国石油天然气股份有限公司科学研究与技术开发项目(2012E--3001)联合资助

摘　　要：根据辽河盆地东部凹陷45口钻井的305.79 m玄武岩岩芯、176个岩芯薄片和其对应井段的测井资料,将东部凹陷玄武岩分为致密玄武岩、气孔玄武岩和角砾化玄武岩等3类。致密玄武岩呈致密块状,蚀变程度低,测井响应以高密度(平均值为2.71 g·cm^(-3))、低自然伽马(平均值为36 API)为特征;气孔玄武岩气孔发育,多被沸石、方解石等充填,蚀变程度最高,测井响应以低密度(平均值为2.47 g·cm^(-3))、高声波时差(平均值为72μs·ft^(-1))为特征;角砾化玄武岩呈自碎角砾状,发育角砾间孔,测井响应以低电阻率(平均值为8Ω·m)为特征。这3种玄武岩的测井响应机理与其矿物组成、结构构造、蚀变类型及程度、孔缝发育程度及后期充填改造、流体类型等密切相关。Based on the basalt cores of 305. 79 m long,176 rock slides and their corresponding logging data of 45 wells in the eastern depression of Liaohe Basin,the basalts are divided into the massive,vesicular and brecciated basalts in category. The massive basalt is dense and massive,underwent a low degree of alteration,and its logging is characterized by high density（ in average of 2. 71 g·cm^（-3）） and low natural gamma（ in average of 36API）. The vesicular basalt is developed in vesicles,mostly filled with zeolite and calcite,underwent the most serious alteration,and its logging is characterized by low density（ in average of 2. 47 g·cm^（-3）） and high acoustic time（ in average of 72 μs·ft^（-1））. The brecciated basalt is in autobrecciated form,developed in inter-breccia spaces,and its logging is characterized by low resistivity（ in average of 8 Ω · m）. The mechanisms of well-logging response of the basalts depend on mineral composition,structure,alteration type and degree,reservoir space and later modification,and hydrocarbon saturation,etc.

关 键 词：辽河盆地 东部凹陷 玄武岩 岩石学特征 测井响应特征 

分 类 号：P588.145[天文地球—岩石学] P631.322[天文地球—地质学]