FLAIR、地球化学录井技术在珠江口盆地陆丰凹陷低对比度油层中的应用

Application of FLAIR and Geochemical Logging Technology in Low-Contrast Reservoir of Lufeng Sag in Pearl River Mouth Basin

张兴华 徐长敏 熊亭 袁胜斌 于喜

ZHANG Xinghua XU Changmin XIONG Ting YUAN Shengbin YU Xi

中法渤海地质服务有限公司，天津　300452 中海石油(中国)有限公司深圳分公司，广东深圳　518067

China-France Bohai Geological Service Co. Ltd., Tianjin 300452, China China Offshore Oil Co. Ltd. Shenzhen Branch, Shenzhen Guangdong 518067, China

在油气勘探作业过程中，要求在随钻过程中及时、有效发现并评价油气显示层，在沉积条件、成岩作用等诸多因素影响下，珠江口盆地陆丰凹陷古近系恩平组、文昌组储层电性与含油性关系复杂，普遍发育低孔低渗低对比度油层。针对使用常规录井、测井技术评价陆丰凹陷恩平组、文昌组低对比度油层难题，该文基于陆丰凹陷古近系恩平组、文昌组储层特征及各单项录井技术自身优势，通过优选录井技术组合系列，建立烃源岩内FLAIR解释评价标准及地化衍生参数图版，达到了随钻过程中及时、准确解释评价低对比度油层的目的，其随钻评价效果与钻后取样、测试结果一致。实践表明，FLAIR实时地层流体录井技术与地化录井技术组合系列有效地提高了陆丰凹陷随钻过程中综合解释符合率，对于提升陆丰凹陷的勘探效益具有一定的意义。

In the process of oil and gas exploration, it is required to timely and effectively discover and evaluate the oil and gas display layer in the process of drilling. Under the influence of many factors such as sedimentary conditions and diagenesis, the relationship between reservoir electrical properties and oil-bearing properties of Paleogene Enping Formation and Wenchang Formation in Lufeng Sag of Pearl River Mouth Basin is complex, and low-porosity, low-permeability and low-contrast reservoirs are generally developed. In order to solve the problem of using conventional logging and well logging technology to evaluate the low-contrast reservoirs of Enping Formation and Wenchang Formation in Lufeng Sag, based on the reservoir characteristics of Paleogene Enping Formation and Wenchang Formation in Lufeng Sag and the advantages of each single logging technology, this paper establishes the FLAIR interpretation and evaluation standards and the geochemical derivative parameter chart in source rocks by optimizing the combination series of logging technology, which achieves the purpose of timely and accurate interpretation and evaluation of low-contrast reservoirs during drilling. The effect of evaluation while drilling is consistent with the result of sampling and testing after drilling. The practice shows that the combination series of FLAIR real-time formation fluid logging technology and geochemical logging technology effectively improves the coincidence rate of comprehensive interpretation while drilling in Lufeng Sag, and has certain significance for improving the exploration benefit of Lufeng Sag.

https://doi.org/10.3969/j.issn.1008-2336.2021.04.049