摘要
碳酸盐岩缝洞储集体具有丰富的油气资源,洞穴是其最主要的储集空间,电性特征是评价洞穴充填情况的重要指标,利用双侧向测井资料表征洞穴充填物真实的电性特征对洞穴充填情况的准确评价具有重要的作用.应用三维有限元法对等效洞穴地层模型进行双侧向测井响应数值模拟,分析洞穴尺寸、洞穴充填物和基岩对双侧向测井响应的影响.分析结果表明:当洞穴较大时,浅侧向测井响应受基岩和洞穴尺寸影响很小,可直接将浅侧向测井响应作为洞穴充填物电阻率;当洞穴较小时,双侧向测井响应无法直接反映洞穴充填物电阻率,因此应用洞穴尺寸、基岩电阻率和浅侧向测井响应建立洞穴充填物电阻率的计算模型.该模型计算得到的洞穴充填物电阻率与给定的洞穴充填物电阻率具有很好的相似性,在西部某油田实际井资料处理解释中亦取得了良好的应用效果.洞穴充填物电阻率的准确计算为缝洞储集体的测井识别和解释评价提供了有力支撑.
Fractured-cave carbonate reservoir is rich in oil and gas resources. Cave is the most important reservoir space. Electrical characteristics are important indicators for evaluating caves and fillings. Using dual laterolog data to characterize the true electrical characteristics of the cave fillings has important significance in the accurate evaluation of the caves and fillings. Three-dimensional finite element method is applied to simulate the dual laterolog response of the equivalent cave formation model of different cave size,cave fillings and bedrock,the response of which on dual laterolog response is analyzed then. On this basis,when the case is large,shallow laterolog response is less affected by bedrock and cave size,and can be used directly as the cave fillings resistivity.When the case is small,dual laterolog responses can not directly reflect the cave fillings resistivity. So the cave fillings resistivity is calculated by the length of cave drilled by well,bedrock resistivity and the shallow laterolog response. The cave fillings resistivity calculated by this model has a good similarity with the given one.The practical data processing interpretation of an oilfield in western oil field is well applied. The accurate calculation of the cave fillings resistivity provides a strong support for the logging identification and interpretation evaluation of the fractured-cave carbonate reservoir.
作者
王晓畅
胡松
孔强夫
WANG Xiao-chang;HU Song;KONG Qiang-fu(SINOPEC Exploration and production Research Institute, Beijing 100083, China)
出处
《地球物理学进展》
CSCD
北大核心
2018年第3期1155-1160,共6页
Progress in Geophysics
基金
国家科技重大专项"不同类型缝洞储集体测井精细评价"(2016ZX05014-002-001)
国家科技重大专项"超深层碳酸盐岩缝洞性储层测井精细评价技术"(2017ZX05005-005-005)
中科院先导专项"深层碳酸盐岩油气储层地质建模"(XDA14010204)联合资助
关键词
洞穴
充填物
电阻率
双侧向测井
数值模拟
cave
fillings
resisitivity
dual laterolog
numerical simulation
