辽河坳陷古近系玄武岩气孔带测井响应特征与储层意义  

Logging response of vesicle zonation and reservoir significance of Paleogene basalts in Liaohe depression

作　　者：韩旭[1] 黄玉龙[1] 刘兴周[2] 郭强[2] HAN Xu;HUANG Yulong;LIU Xingzhou;GUO Qiang(College of Earth Sciences,Jilin University,Changchun 130061,China;Research Institute of Liaohe Oilfield,CNPC,Panjin 124010,Liaoning,China)

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

出　　处：《世界地质》2022年第3期559-567,共9页World Geology

基　　金：国家自然科学基金项目(41702128);中国石油天然气股份有限公司重大科技专项(2017E-1601)联合资助。

摘　　要：基于16口钻井岩芯和常规测井资料,通过岩芯描述、薄片鉴定、扫描电镜、孔隙度(Φe)测定及气孔含量(Φv)统计,将辽河坳陷古近系玄武岩流动单元划分为致密层(Φv<1%,Φe<5%)、少孔层(1%<Φv<5%,5%<Φe<10%)、中孔层(5%<Φv<10%,10%<Φe<15%)和多孔层(Φv>10%,Φe>15%)。提出将少孔层声波时差下限(59.7μs·ft^(-1))、中孔层声波时差下限(61.5μs·ft^(-1))和上限(84.3μs·ft^(-1))分别作为划分致密层、少孔层、中孔层和多孔层的测井界线。总结了板状熔岩流、气孔-致密互层型和多孔-少孔互层型复合熔岩流3类玄武岩储层流动单元的测井响应特征与气孔分带模式。指出玄武岩储层有效孔隙包括气孔充填残余孔、杏仁体溶孔和黏土矿物杏仁体内微孔,多孔-少孔互层型复合熔岩流整体上气孔发育,储集性能最好。Based on coring and conventional logging data of 16 wells,lava flow units of Paleogene basalts in Liaohe depression are divided into four layers including massive layer(Φv<1%,Φe<5%),minor vesicular layer(1%<Φv<5%,5%<Φe<10%),medium vesicular layer(5%<Φv<10%,10%<Φe<15%)and highly vesicular layer(Φv>10%,Φe>15%)through core description,thin section identification,scanning electron microscope,porosity(Φe)measurement and vesicle proportion(Φv)statistics.It is proposed that the lower limit of AC in minor vesicular layer(59.7μs·ft^(-1)),lower limit of AC in medium vesicular layer(61.5μs·ft^(-1))and the upper limit of AC in medium vesicular layer(84.3μs·ft^(-1))as the logging division of massive,minor vesicular,medium vesicular and highly vesicular layer,respectively.Three types of reservoir distribution patterns and their logging responses are summarized including tabular lava flow unit,vesicular-massive and minor-highly vesicular interbedding compound lava flow unit.The effective porosities of basaltic reservoir are composed of residual infilling vesicles,amygdaloid dissolved porosities and micropores inside amygdaloid of clay minerals.On the whole,high-quality reservoirs are primarily developed in the minor-highly vesicular interbedding lava flow unit due to larger vesicle proportion.

关 键 词：古近系玄武岩 气孔分带性 测井响应 火山岩储层 辽河坳陷 

分 类 号：P618.13[天文地球—矿床学] P588[天文地球—地质学]