为研究碳酸盐岩、火山岩等洞穴型储集层双侧向测井响应特征,基于数值模拟优化设计实验室缩小比例物理模拟系统的仪器及地层模型参数,并用物理实验数据标定数值模拟结果,进而研究原始地层条件下洞穴型储集层的双侧向测井响应特征。结果表明：实验室地层径向半径和纵向长度分别为1.0 m和2.0 m,双侧向测井仪器纵向及径向分别缩小为1/20和1/6时,即可满足实验室缩小比例物理模拟的需要,且缩小比例物理实验结果与数值计算结果对应性好。利用物理模拟实验刻度后的数值模拟参数,研究洞穴型原状地层双侧向测井响应特征,结果表明：井旁洞穴双侧向测井曲线在洞穴中心深度位置视电阻率达到最低,双侧向测井值无法准确反映洞穴真实电阻率值;洞穴半径越大、充填物电阻率越低、洞穴距井壁越近,双侧向测井对井旁洞穴敏感性越强;深侧向测井可识别的洞穴边界至井壁径向距离小于0.5 m,浅侧向测井可识别最大距离为0.3 m。图9参10
范宜仁
,
王磊
,
葛新民
,
范卓颖
,
巫振观
,
刘家雄
,
黄瑞
. 洞穴型地层双侧向测井响应模拟与特征分析[J]. 石油勘探与开发, 2016
, 43(2)
: 237
-243
.
DOI: 10.11698/PED.2016.02.09
To figure out the response characteristics of dual laterolog logging in carbonate and volcanic cavernous reservoirs, the parameters of laboratory formation model and tool were optimized on the basis of numerical simulation, then, the experimental data was used to calibrate the numerical simulation results. Finally, the response characteristics of cavernous formations in the original formation condition were acquired. The results show that the radial radius and height were set to 1 and 2 meters, meanwhile the length of dual laterolog in vertical and radial direction were reduced to 1/20 and 1/6, which can satisfy the need of laboratory experiments and there is a good match between experimental data with numerical results under the same circumstance. The numerical simulation parameters calibrated by physical modeling experiment were used to find out the dual laterolog response characteristics of cavernous formations. The results show the apparent resistivity on the dual laterolog by the well bore is the lowest at the cave center, and the apparent resistivity could not accurately reflect the infill resistivity of the cave; the larger the radius of the cave, the lower of the infill resistivity and the smaller the distance between the cave and the well bore, the more sensitive dual laterolog will be to caves in formations. The distance between the cave boundary and well wall that could be recognized by deep laterolog is less than 0.5 m, as for shallow laterolog, the largest distance is 0.3 m.
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