高伽马值储层成因分析及识别方法  

Genesis analysis of high GR reservoir and its well-log based recognition method

作　　者：张涛[1] 林承焰[1] 张宪国[1] 于景锋[2] 卢显荣[3] 张守秀[4] 

机构地区：[1]中国石油大学华东地球科学与技术学院,山东青岛266555 [2]新疆油田公司勘探开发研究院,新疆克拉玛依834000 [3]中石化江苏油田地质科学研究院,江苏扬州225012 [4]中石化胜利油田东辛采油厂,山东东营257000

出　　处：《石油地球物理勘探》2012年第3期491-495,359-360+518,共5页Oil Geophysical Prospecting

基　　金：国家科技重大专项课题(编号:2011ZX05009-003);国家自然科学基金项目(编号:40872094);校自主创新科研基金(11CX04008A)

摘　　要：在T区碎屑岩地层中发现大量高伽马值储层,其自然伽马测井曲线特征与非储层之间差异小,易被解释为非储层。本文对高伽马值储层进行岩石组分分析,并与非储层岩石微观特征进行对比,认为该区高伽马值储层的成因因素主要是火山碎屑物质的增加、黏土类型的变化和黏土颗粒吸附具有放射性的有机质。在此基础上,本文提出利用Pe-GR交会法和体积模型法识别研究区高伽马值储层,前者利用了Pe不受放射性影响的优势,后者则通过建立超定方程组求解各等效组分的含量,有效解决了该区高伽马值有效储层识别难题。In clastic formation of Area T,high GR reservoirs are found.The GR log difference between these reservoirs and mudstones is so little that it is hard to tell high GR reservoirs from mudstones.In this study,rock constituents of high GR reservoirs are analyzed and are compared with these of nonreservoirs.The genesis factors of high GR reservoirs are concluded as the increase of pyroclastics,the change of clay types and the absorption effect of clay particles.With the above study,two methods,Pe-GR cross plot analysis and volume model are used to interpret these high GR reservoirs.The former method is based on the insensitiveness of Pe on radioactivity.In the latter method,overdetermined equation groups are constructed and volume contents of the equivalent components can be obtained by resolving these equation groups.This study established effective solutions for high GR reservoir identification.

关 键 词：高伽马值储层 成因 测井识别 凝灰质 光电吸收截面指数 体积模型 

分 类 号：P631[天文地球—地质矿产勘探]