dc指数法识别查干凹陷火山岩储集层  

Dc index method of identifying volcanic reservoirs in Chagan depression

作　　者：张坤贞 王舒 郑玉朝 王玉府 董珊珊 

机构地区：[1]中石化中原石油工程有限公司录井公司

出　　处：《录井工程》2014年第4期31-34,101,共4页Mud Logging Engineering

摘　　要：查干凹陷火山岩储集层主要为孔洞-裂缝或裂缝-孔洞型,为典型的特殊油气藏储集层,在火山岩钻探过程中,由于井壁垮塌非常普遍,井径扩大率较大,使得声波时差、密度等测井资料失真,造成利用测井资料识别火山岩储集层困难,而综合录井参数具有不受井径扩大影响的特点。火山岩储集层孔隙度与可钻性的相关性分析表明,两者线性相关(r2=0.845);dc指数随孔隙度的增大而减小,当dc指数小于1.85时,孔隙度值达到11%以上,为有利储集层区。实践表明,dc指数较小的区域储集层发育,油气显示富集,反之储集层物性较差,应用dc指数法进行火山岩储集层识别与评价取得了较好效果。The main volcanic reservoirs in Chagan depression are vuggy and fractured or fractured and vuggy types,which are typical and special hydrocarbon reservoirs,it is difficult to identify volcanic reservoirs with wireline logging data in the course of volcanic rock drilling because common wall collapse and large ratio of the hole′s extending diameter make interval transit time,density,and other wireline logging data distortion.The hole′s extending diameter does not influence comprehensive mud logging data, the correlation analysis showed a linear correlation between porosity and drillability of volcanic reservoirs,the coefficient of correlation was0.845,dc index decreased with the porosity increased,it was a favorable reservoir area when dc index was less than1.85 and porosity value was up to 11% or more.The practical application indicated the reservoirs were developed and oil and gas showed enrichment in the areas with the smaller index,otherwise the physical properties were poor.It has achieved good results to use dc index to identify and evaluate volcanic reservoirs.

关 键 词：查干凹陷 火山岩 井径扩大 孔隙度 DC指数 储集层识别 

分 类 号：TE142[石油与天然气工程—油气勘探]