2016年第6期
中州煤炭
总第246期
齐家油田致密储层脆性指数计算方法研究
委娜，赵天琦，张雁
（东北石油大学地球科学学院，黑龙江大庆163318）
摘要：脆性指数大小及分布规律是制订储层压裂方案、提高致密储层产能的重要依据。脆性指数主要是通过岩心试验和岩石力学参数法获得。为了计算岩心和岩石力学参数缺失的油田脆性指数，有效开采致密储层，利用取心井岩心测试得出脆性指数，而后与测并曲线进行了相关性分析，优选出高相关的自然伽马曲线，建立了适合本区的脆性指数测井解释模型。最后利用该曲线解释出全区各井层的脆性指数。通过分析脆性指数与矿物类型、含量、粒度等关系可知：岩石粒度越细，石英、钙质胶结物含量越高，脆性指数值越高。在该区内优选脆性指数较高的井层开展现场试验，取得了较好效果。关键词：脆性指数；杨氏模量；泊松比；自然伽马；致密油藏
中图分类号：P618.13
文献标志码：A
文章编号：10030506(2016)060140-05
Study on calculation method about brittleness index of tight sandstone reservoirs
inQijiaOilField
Lou Na,Zhao Tianqi,Zhang Yan
(School of Earth Sciences, Northeast Petroleum University,Daqing163318,Chine)
Abstract: The range of brittleness index and distribution law is the important evidences of making reservoir fracturing scheme and in-creasing production of tight reservoir. However, the main way to get britleness index is core test method or rock mechanics parameters method. To caleulate the britle index of the oil fields, which lack data of core and rock mechanics parameters, mining tight sandstone reservoir effectively. Firstly ,the authors used the eore from core hole to calculate brittleness index,and then made a correlation analysis with well logs, After that,they picked out the natual gamma as the highest correlation to the britleness index eurve,then established the logging interpretation model of brittleness index of this area;at last,by using gammas log,they have caleulated the britleness index of all wells and layers in the hole area. The relationship between brittleness index and the type, content, granularity of the rock were analyzed in this paper,then it was diseovered thst higher rock grain size, quartz and calcareous cement,with better property make higher brittle-
ness index. Well layers of high brittleness index were picked to carry out field investigation,and has obtained a favorable effect Keywords;britleness index; Young's modulus; Poisson's ratio; natual gamma;tight reservoir
引言 0
齐家油田构造位置在松辽盆地齐家——古龙凹陷齐家北凹陷的西北斜坡上，是一个区域鼻状构造背斜之上的弯隆背斜构造。齐家油田高台子油层孔隙度小于10%的数据占80%，渗透率小于0.1× 10-"μm的数据占总体的56%，属于致密油藏，产能一直偏低。确定岩石脆性大小及分布对制订缝网压裂方案有重要的意义，目前期望在研究区内找出
位置和层段，以达到通过实现缝网压裂达到提高产能的目的。
致密油藏的储集层致密、岩性复杂，目前研究成果认为压裂改造是提高工业产能一种重要手段[1-3] 因此，可压性评价对于优选压裂井段具有重要意义。国外学者通过室内岩石脆性试验发现，岩石压裂的难易程度可用脆性指数表征，岩石脆性指数高，地层性质脆硬，越易形成破裂缝，对压裂作业反应越敏感，进面对储层内流体的储集和运移都有利。故该
DO1;10. 19389/j. enki. 1003 0506. 2016.06. 035
收稿日期：201603-27；资任编辑：秦爱新
娜（1991一），女，黑龙江拜泉人，在读硕士研究生，现就读于东北石油大学2014级地质T.程（全）专业。
作者简介：要
逐，赵天璃，张雁，齐家油田致密储层脆性指数计算方法研究[J].中州煤炭，2016(6：140-144.
引用格式：要
Lou Na,Zhao Tianqi, Zhang Yan. Study on caleulatioe method about britleness index of tight sandstone reservoirs in Qijia Oil Field[ J]] Zhongzhou Coal,2016(6) ;140-144.
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