利用测井资料评价低孔隙度低渗透率气层产能方法研究  

Research on Productivity Evaluation in Low Porosity and Permeability Gas Reservoir by Logging Data

作　　者：邵维志[1] 王志勇[1] 张杰[2] 成振娥[1] 肖菲[1] 岂红军[1] 刘竹杰 

机构地区：[1]大港油田集团测井公司 [2]冀东油田公司柳赞作业区,河北唐海063200

出　　处：《测井技术》2007年第6期541-545,共5页Well Logging Technology

摘　　要：针对苏里格气藏苏20区块独特的地质特点,充分利用岩心、测井及现场试气资料,应用岩心刻度及交会图技术,建立自然伽马测井曲线与岩石粒径、孔隙度之间的关系,确定了盒8及山1段有效储层的下限值。应用多元逐步回归技术,在优选出具有代表性变量的基础上,计算出能够充分反映储层物性的综合指数MVI。综合应用流体压缩系数法和视弹性模量差比法计算储层含气指数FG。提出打开储层质量系数QI概念,定义它为射孔厚度与压裂高度之和除以储层有效厚度。通过GR、MVI、FG、QI、有效厚度与试气产量的结合,将苏20区块盒8及山1段气层分为3类,确定了各类气层的产能及解释标准。为现场工程和地质射孔方案及压裂措施的设计提供了可靠的依据。经过20多口井的应用,效果显著。Established is an integrative productivity evaluation method of He-8 and Shan-1 formation in Su-20 block,Sulige gas field,based on data of core,logs and gas tests.The method integrates effects of GR,MVI,FG and QI,where natural gamma log GR has rather good correlation with grain size and porosity of rock;MVI is a multivariate petrophysics index reflecting synthetically petrophysical properties of the reservoir,and is calculated from optimized variables,such as logs of SP,density,neutron,acoustic and GR,by weighted multiple stepwise regression;factor of gas bearing FG is calculated with fluid compressibility coefficient method and difference-ratio method of apparent Young's module;quality index of opened reservoir QI is defined as the ratio of sum of perforated interval and fracture height to the thickness of effective intervals.Based on the method,gas reservoirs of He-8 and Shan-1 formation in Su-20 block are classified into three types,and respective criteria of productivity and interpretation are established.The method gains good effect in more than 20 wells.

关 键 词：低孔隙度 低渗透率 多变量物性指数 综合含气指数 质量系数 有效储层 产能评价 

分 类 号：P631.84[天文地球—地质矿产勘探]