渤海05/31合同区火成岩岩性测井识别方法及应用

The lithology identification and application of igneous rock based on well logging in Bohai 05/31 block

渤海05/31合同区各目的层组发育大段的火成岩。火成岩较碳酸盐岩的矿物成分复杂,岩性多样,研究难度较大。由于目前该区在火成岩段未进行钻井取心工作,其火成岩岩性解释仅仅依靠录井岩屑资料,误差较大,且与测井曲线反映的岩性存在明显不符的现象。在对该区测井资料进行标准化处理基础上,开展火成岩岩石学和测井响应研究,基于岩屑录井,岩屑薄片及地球化学方法,总结相对应的测井响应特征和岩石物理敏感参数,利用标准井测井资料建立火成岩岩电识别标准和图版;采用Elan-Plus最优化模型组综合解释技术,编制了合同区6口井火成岩测井骨架矿物分析和岩性识别成果图。经过验证,测井岩性识别效果较录井岩屑有了较大程度的提高。

There are abundant igneous rocks in the zones of interest in Bohai 05/31 Block.The mineral composition of igneous rock is much more complex and variety than the one of carbonate rock,therefore it is difficult to exploit.Since there are no any data of coring in the formation,the lithology identification of igneous rock just depends on the data of sample mud logging with big error,and obviously there are inconsistencies with the lithology in response to well logging.Based on the standard processing of log data in this area,carrying out the research of the igneous petrology and well logging response,based on the sample log,rock slice and geochemistry theory,summarizing the corresponding logging response characteristics and petrophysical sensitive parameters,establishing rock electricity relationship standards and charts for igneous rocks with the data of type well.Finally using the optimization well logging method,for example,Elan-Plus program,to obtain the drawing of mineral composition of rock skeleton and lithology identification results figure for 6 wells.After verification,well logging lithology identification has been improved to a greater extent than the mud logging.