试井资料在复杂碳酸盐岩储层类型识别中的应用--以磨溪地区震旦系碳酸盐岩储层为例  

Application of well-test data to identifying the types of complex carbonate reservoirs:Examples from Sinian carbonate reservoirs,Moxi area,Sichuan Basin

作　　者：胡燕[1] 易劲[1] 欧家强 袁权[1] 郭静姝[3] 蔡珺君 颜平 Hu Yan;Yi Jin;Ou Jiaqiang;Yuan Quan;Guo Jingshu;Cai Junjun;Yan Ping(Central Sichuan Oil and Gas District,PetroChina Southwest Oil&Gasfield Company,Suining,Sichuan 629000,China;Gas Production Administrative Department of Northern Central Sichuan Gas District,PetroChina South­west Oil&Gasfield Company,Suining,Sichuan 629000,China;Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China;College of Energy,Chengdu University of Technology,Chengdu,Sichuan 610059,China)

机构地区：[1]中国石油西南油气田公司川中油气矿 [2]中国石油西南油气田公司川中北部采气管理处 [3]中国石油西南油气田公司勘探开发研究院 [4]成都理工大学能源学院

出　　处：《天然气勘探与开发》2021年第4期52-59,共8页Natural Gas Exploration and Development

摘　　要：由于台缘带碳酸盐岩具有孔、洞和缝发育的多样储集空间,增产改造使近井地带的储渗特征更加复杂化,仅从试井曲线形态难以细分储层类型。在采用取心和钻完井资料识别储层类型的基础上,考虑压裂改造的影响,提出一套适用于复杂碳酸盐岩储层的试井分析方法,能够准确地识别复杂碳酸盐岩储层的类型,弥补了以往试井解释在复杂碳酸盐岩储层类型识别上的不足。研究结果表明:①需要排除井型差异对试井曲线的影响,选用直井开展储层类型识别;②磨溪区块储层主要为孔-洞型储层以及缝-洞型储层。由于酸化压裂改造的影响,应选择“双孔介质+径向复合”的试井模型试井解释;③外区的试井曲线能表征储层的渗流特征,储容比以及窜流系数可以区分孔-洞型、缝-洞型储层;④储层类型识别与基于取心和钻完井资料的识别结果一致,验证了该方法的可靠性。Since some platform marginal carbonate reservoirs are well developed with various reservoir space,such as pores,vugs and fractures,the stimulation makes permeability character near wells more complex,resulting in great challenge to reservoir-type classification only by shape of well-test curves.So,based on coring and drilling data to identify the type,a well-test analysis method available for complex carbonate reservoirs,which takes fracturing stimulation into consideration,was proposed.And this method may not only identify accurately the type of complex carbonate reservoirs,but also compensate for the lack of previous well-test interpretation on the reservoir type.Results show that(1)it is necessary to eliminate the influence of different well types on well-testing curves,and it is better to select vertical wells as type identification;(2)most reservoirs in Moxi block mainly belong to porous-vuggy and fractured-vuggy ones.So,influenced by acid fracturing,a"double porous medium and radial complex"model is better for well-test interpretation on these reservoir types;(3)the well-testing curves in other areas can represent percolation feature,and both storativity ratio and inter-porosity flow coefficient can distinguish these porous-vuggy and fractured-vuggy reservoirs;and(4)the reservoir types identified by this well-test method are consistent with those from coring and logging data,proving its effectiveness.

关 键 词：碳酸盐岩 储层类型 双孔介质 径向复合 储容比 窜流系数 

分 类 号：P618.13[天文地球—矿床学]