| 青海木里三露天天然气水合物钻孔岩性测井识别 |
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| 引用本文： | 曲璐,邹长春,宗青颖,侯颉,朱吉昌,李康,岳旭媛,李宁.青海木里三露天天然气水合物钻孔岩性测井识别[J].现代地质,2015,29(5):1122-1129. |
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| 作者姓名： | 曲璐 邹长春 宗青颖 侯颉 朱吉昌 李康 岳旭媛 李宁 |
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| 作者单位： | (1.中国地质大学(北京)地球物理与信息技术学院，北京100083；2. 中国矿业大学(北京)地球科学与测绘工程学院，北京100083) |
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| 基金项目： | 神华青海能源开发有限责任公司项目“青海省天峻县聚乎更煤矿区三露天天然气水合物调查评价”(SHQHNY201307001)；中国地质调查局项目“祁连山冻土区天然气水合物资源勘查 ”(GZH201400302)。 |
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| 摘 要： | 三露天井田具有断层发育、地层缺失和重复明显、岩性种类较多等特点，岩性识别难度较大。为此，专门利用测井资料对三露天井田地层岩性进行了岩性识别研究。通过对14个天然气水合物钻孔不同岩性的测井响应特征分析，优选了自然伽马、中子和密度测井作为岩性识别敏感参数，并采用交会图技术制作了岩性识别图版，建立岩性划分标准，对三露天井田地层岩性进行识别与划分。利用测井资料能够识别7种主要岩性，包括砂岩、粉砂岩、泥质粉砂岩、粉砂质泥岩、泥岩、油页岩和煤等。根据岩性测井识别结果，三露天井田岩性分布特征在横向上表现为东部砂岩物性好，西部地区泥岩较为发育；纵向上表现为木里组地层砂泥比为4.48，含有煤层204.5 m；江仓组地层砂泥比为0.84，泥岩和油页岩较为发育，更有利于水合物赋存。测井岩性识别结果为寻找三露天井田天然气水合物有利储层奠定了基础。
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| 关 键 词： | 岩性识别 天然气水合物 测井 三露天井田 |
Lithological Identification from Well Logs in Gas-hydrate Drilling Holes,Sanlutian of Muli Coalfield,Qinghai |
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| Institution: | (1.School of Geophysics and Information Technology, China University of Geosciences, Beijing100083, China; 2.College of Geosciences and Surveying Engineering, China University of Mining Technology, Beijing100083, China) |
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| Abstract: | The developed faults,lost and repeated formations and diversified lithology are the features of Sanlutian bore field, therefore, it is difficult to identify the lithology. As a result,log data are used specifically to study the formation lithology of Sanlutian bore field. By analyzing the log response characteristics for different lithological in fourteen gas hydrate drillings, Gamma ray log, neutron log and density log are optimized as the sensitive parameters to lithology identification. The lithological identification plate is made by cross plot technique and the identification criterion is built, which are used to identify and subdivide the lithology in Sanlutian bore field. Seven kinds of lithology can be identified by the log data, including sandstone, siltstone, argillaceous siltstone, silty mudstone, mudstone, oil shale and coal. According to the lithology identification result, the horizontal distribution of lithology in Sanlutian bore field is that sandstone in the east has good physical property and the well -developed mudstone is in the west; vertical distribution is that the sand to shale ratio is 4.48 in Muli Formation which has coal beds of 204.5 meters, while 0.84 in Jiangcang Formation that has abundant mudstone and oil shale which means better for the hydrate occurrence.The logging identification results of lithology lay the foundation of locating the favorable reservoir of gas hydrate in Sanlutian bore field. |
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| Keywords: | lithology identification gas hydrate well log Sanlutian bore field |
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