红外光谱技术在羌塘 TK-1天然气水合物岩心录井中的应用

Application of infrared spectroscopy technology in core logging of natural gas hydrate well TK-1 in Qiangtang Basin, Xizang

中文关键词: 红外光谱  录井  羌塘  天然气水合物  岩心中图分类号:P581文献标志码:A文章编号:1674-7801(2025)02-0337-13

英文关键词: infrared spectroscopy  logging  Qiangtang  natural gas hydrate  core

中文摘要:

      红外光谱技术可以识别矿物信息，具有绿色、快速、无损探测的特点。羌塘盆地乌丽地区天然气水合物资源潜力较大，但目前勘探程度较低，地质状况较复杂，钻井岩心矿物格架识别有限，制约了对后续油气资源评价、勘探开发等工作的顺利开展。本文通过红外光谱技术对羌塘乌丽地区 TK-1天然气水合物钻井开展岩心录井，并辅以 QEMSCAN对红外光谱岩心录井信息补充验证。结果表明:TK-1钻井的砂岩、泥岩主要由石英、斜长石、钾长石、伊利石、高岭石和少量的绿泥石、碳酸盐、蒙脱石、石膏、地开石等矿物组成，砂岩主要的胶结类型按形成顺序依次为黏土矿物胶结、碳酸盐胶结，黏土矿物形成顺序为伊利石—高岭石—绿泥石。高岭石、地开石和绿泥石的脉状发育，代表了成岩后期存在小范围的构造活动和热扰动，可能会影响油气的运移和保存，因此在天然气水合物资源勘查过程中，需要关注绿泥石脉、地开石脉、高岭石脉发育较弱的区域。红外光谱技术对羌塘盆地乌丽地区天然气水合物钻井矿物和岩石等地质信息录井和识别具有独特的优势和应用潜力，是传统录井技术所获信息的重要补充。

英文摘要:

      Infrared spectroscopy technology can collect mineral information according to the characteristics ofmineral infrared spectrum, which has the advantages of green, rapid, non-destructive detection. There is a great po-tential of natural gas hydrate resources in Wuli area, Qiangtang Basin. However, its low exploration degree, compli-cated geological condition, difficult to identify mineral framework of drilling core, restricts the development of subse-quent oil and gas resource exploration and exploitation, at present. This paper is to collect mineral information in-cluding types and contents of minerals. and to obtain geological interpretation of the TK-1 well by ore logging usinginfrared spectroscopy technology as well as QEMSCAN. The following conclusions can be obtained based on thisstudying: The core of the TK-1 well (containing mudstone and sandstone) is composed with quartz, plagioclase, pot-ash feldspar, illite, kaolinite and a small quantity of chlorite, carbonate, smectite, gypsum dickite etc. Carbonate ce-mentation is formed after clay mineral cementation in sandstone. Clay minerals are formed in the order of illite—ka-olinite—chlorite. These kaolinite, dickite and chlorite veins with irregular forms and small scales, demonstrate thatthere are small-scale tectonic activities and thermal disturbance in the postdiagenetic period, which suggest that thearea where chlorite, dicket and kaolinite veins are weakly developed should be focused when natural gas hydrate re-sources are explored in Qiangtang Basin. Infrared spectroscopy technology has great advantages in identifying fine-grained minerals and clay minerals, which can make up for traditional logging technology in mineral information col-lecting.