摘要
为了精细评价Z油田储层的裂缝影响,本文基于实际资料,结合国内外裂缝研究实际,以沉积构造背景与应力场背景研究为基础,综合利用地质、岩心、测井及生产动态等资料,对有限取心井进行细致研究,建立了Z油田特低渗砂岩储层天然裂缝判识标准,并优选适用的天然裂缝判识方法,进而以单井裂缝识别为基础,运用多种方法预测裂缝的平面分布规律。研究结果表明:Z油田储层天然裂缝普遍发育,且以高角度缝为主;适用于该区的裂缝判识方法主要有重构FRAC1裂缝指示参数法、测井曲线R/S变尺度分析法和渗透率异常分析法等;区内裂缝平面上总体呈断续带状分布,南部裂缝走向呈近南北向,中部裂缝走向为北北东向,北部裂缝走向为北东东向;裂缝发育的区域渗透率级差显著。
In order to accurately evaluate and predict the influence of fracture in Z oilfield,the integrated studies were conducted based on the field datasets in the oilfield and the fracture research in both home and abroad,deposition tectonic setting and stress field background study were the basis and the geological data,core data,well logging data,production performance and other data were integratedly utilized in the studies.For the few cored wells the detailed studies were conducted,the natural fracture identification criterion for sand reservoir with ultra-low permeability was established,the proper natural fracture identification method was optimized,then based on single well fracture identification,the plane distribution law for the fractures was predicted by applying several prediction methods.The study results show that the natural fractures are fully developed in the reservoirs of Z oilfield,large angle fractures are the dominant,the fracture identification methods which fit the oilfield mainly include reconstructed FRAC1 fracture index parameter method,well logging curve R/S variable scale analysis method and permeability anomaly analysis method and so on.The plane distribution of the fractures in the oilfield is in intermittent zonal distribution form,the distribution direction for the fractures in the south is near SN direction,the fractures in the middle distribute is NNE direction,and the fractures in the north distribute is NEE direction,in the fracture development zone the permabilities vary greatly.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2010年第4期584-590,共7页
Oil Geophysical Prospecting
基金
陕西省工业攻关计划基金资助项目(项目编号2009K10-15)
关键词
Z油田
天然裂缝
测井
录井
识别技术
分布规律
Z oilfield,natural fracture,well logging,logging,recognition technique,distribution rule
