Logging identification of Ordovician karst cave filling in the Tahe Oil Field
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摘要: 中国石化西北油田分公司针对塔河奥陶系目的层部署的钻井约1300余口,其中1/3左右的井为放空或者漏失。从实钻资料分析,有相当一部分井直接钻遇了溶洞型储集体,有的溶洞未被充填,有的已受到一定程度的充填,并且充填物的性质存在较大的差异。为了能够准确高效地识别出溶洞充填物的性质,为完井方案的部署和完井井段的选择提供有力的测井技术支撑,按照由"正演"到"反演"的思路,通过溶洞体中的取心资料标定常规测井,总结不同充填物的测井响应特征,研究充填物测井交会图判别技术,并针对塔河6、10、12区等地区的奥陶系古暗河开展充填规律研究分析。Abstract: The SINOPEC Northwest Company has deployed over 1300 wells in the Ordovician in the Tahe Oilfield, among which about 1/3 of the wells turned out empty or leaking. Many wells drilled to karst caves. The caves were partially filled, and the filling materials had various physical properties. The accurate identification of the nature of cave fillings can help the deployment of completion program and select completion interval. We used core data to calibrate conventional logging, summarized the logging responses of different fillings, and identified fillings on seismic maps. The fillings of ancient underground rivers in blocks 6, 10, 12 in the Tahe Oil Field were studied.
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Key words:
- imaging logging /
- conventional logging /
- karst cave /
- Ordovician /
- Tarim Basin
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