元素录井技术在潜山油气勘探中的应用

Application of Element Logging Technology in Buried Hill Oil and Gas exploration

熊亭 曹英权

XIONG Ting CAO Yingquan

中海石油（中国）有限公司 深圳分公司，广东深圳　430100 中法渤海地质服务有限公司，天津　300450

Shenzhen Branch, CNOOC (China) Ltd., Shenzhen, Guangdong 518067, China China-France Bohai Geoservices Co. Ltd., Tianjin 300452, China

为了解决惠州26-6构造潜山岩性识别、潜山界面卡取及储层评价等难题，该文利用元素录井资料，结合高分辨率电成像测井、钻井及井壁取心等资料进行研究，取得了以下研究成果：（1）利用元素录井中Si-Fe、Si-Na数据建立潜山岩性识别图版，可以用于随钻过程中快速识别岩性；（2）分析潜山地层与上覆地层岩性的元素变化特征，总结进山模式，可以实现潜山界面的随钻快速卡取；（3）基于元素迁移能力的差异性，建立易迁移元素指数EI及不易迁移元素指数NI，实现对花岗岩和闪长岩进行内幕带和风化带区分；（4）建立缝洞指数，有效地表征出潜山储层裂缝及孔洞发育情况。研究表明，元素录井技术可以在复杂岩性识别、潜山界面卡取、风化带与内幕带划分及储层评价中发挥重要的作用。

In order to solve the problems of buried hill lithology identification, buried hill interface sticking and reservoir evaluation in Huizhou 26-6 Structure, this paper used element logging data, combined with high resolution electrical imaging logging, drilling and wall coring data to study and obtain the following research results: (1) The lithology identification chart of buried hill is established by using Si-Fe and Si-Na data from element logging, which can be used to quickly identify lithology during drilling; (2) By analyzing the element variation characteristics of buried hill strata and overlying strata lithology, and summarizing the mountain entry mode, the rapid sticking of buried hill interface can be realized; (3) Based on the difference of element migration ability, the easy migration element index EI and the difficult migration element index NI are established to distinguish the interior zones and weathering zones of granite and diorite. (4) The fracture-cavity index is established to effectively represent the development of fractures and pores in buried hill reservoirs. This study shows that element logging technology can play an important role in complex lithology identification, buried hill interface sticking, weathering zone and interior zone division and reservoir evaluation.

https://doi.org/10.3969/j.issn.1008-2336.2023.01.045