地应力对致密砂岩电阻率的影响机理及地应力校正电阻率模型的建立——以克深区块巴什基奇克组致密砂岩储层为例  

Influence Mechanism of In-situ Stress on Resistivity of Tight Sandstone and Establishment of In-situ Stress Correction Resistivity Model——Taking the Tight Sandstone Reservoir of Bashijiqike Formation in Keshen Block as an Example

作　　者：袁龙 夏宏泉[2] 王谦 韩闯[3] 王伟[1] 蔡德洋[3] 陈强[3] 张磊[3] Yuan Long;Xia Hongquan;Wang Qian;Han Chuang;Wang Wei;Cai Deyang;Chen Qiang;Zhang Lei(Research Institute of Logging Application,CNPC Logging,Xi an 710201,Shaanxi;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,Sichuan;Research Institute of Exploration and Development,Tarim Oilfield Company,PetroChina,Korla 841000,Xinjiang)

机构地区：[1]中国石油集团测井有限公司测井应用研究院,陕西西安710201 [2]油气藏地质及开发工程国家重点实验室(西南石油大学),四川成都610500 [3]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《长江大学学报（自然科学版）》2020年第6期1-8,M0002,共9页Journal of Yangtze University(Natural Science Edition)

基　　金：中国石油天然气集团有限公司重大科技专项“克深开发区块低孔裂缝性气藏测井储层评价技术研究”(041015080008)。

摘　　要：塔里木盆地克深区块白垩系巴什基奇克组致密砂岩储层处于异常高压和强地应力状态,地层电阻率受地应力影响显著,常以高电阻率水层的假象出现,利用常规储层流体性质判别与饱和度计算方法无法正确评价该类储层。通过建立三应力与孔隙度之间的关系式并结合阿尔奇公式,从理论上进一步印证了地应力增大导致地层电阻率增大的结论。在准确计算高陡构造地应力的基础上,通过对未受地应力作用和受地应力作用情况下的阿尔奇公式进行分析,建立了适合研究区致密砂岩地应力校正电阻率模型,并利用该模型处理了工区多口井的电阻率测井曲线。利用校正后的电阻率计算的地层含气饱和度与试油测试结论及取心资料的符合率明显提高。The tight sandstone reservoir of Cretaceous Bashijiqike Formation in Keshen Block of Tarim Basin is in the state of abnormal high pressure and strong in-situ stress,and the formation resistivity is significantly affected by the in-situ stress,which often appears as the illusion of water layers with high resistivity.Conventional methods of reservoir fluid property identification and saturation calculation cannot be used to evaluate this type of reservoir correctly.By establishing the relation between three stress and porosity,and combining with Archie formula,the conclusion that the increase of in-situ stress leads to the increase of formation resistivity was further verified theoretically.On the basis of accurate calculation of high and steep geotechnic stress,and the analysis of Archie formula without and under in-situ stress,an in-situ stress correction resistivity model of tight sandstone suitable for the study area was established.The resistivity logging curves of several wells in the work area were processed by using the model.The coincidence rate between the gas saturation of the formation calculated by the corrected resistivity and the oil test results and coring data has been obviously improved.

关 键 词：地应力 阿尔奇公式 电阻率 校正模型 高陡构造 巴什基奇克组 塔里木盆地克深区块 

分 类 号：P631.84[天文地球—地质矿产勘探]