China Offshore Oilfield Services Limited
Key Laboratory of Deep Sea Deep Formation Energy Engineering of Hainan Province
School of Resources and Environment,Henan Polytechnic University
Hainan Branch of CNOOC Ltd.

目的目的为了查明琼东南盆地松涛隆起三亚组遗迹组构的发育特征,探讨其油气地质意义,方法方法以琼东南盆地松涛隆起三亚组代表性取心井为研究对象,根据岩心上遗迹化石与围岩发育特征,识别遗迹组构,通过校正岩心和电成像测井的深度,分析各类典型遗迹组构对应电成像测井的响应特征,建立琼东南盆地北部三亚组五类遗迹组构电成像测井识别的参考图版,用于连续电成像测井动态图像上遗迹组构的识别。结果结果结果表明:(1)研究区岩心和电成像测井图像上识别出5种遗迹组构,即Ophiomorpha-Thalassionides遗迹组构,Palaeophycus遗迹组构,Planolites-Thalassionides遗迹组构,Phycosiphon-Planolites遗迹组构和Phycosiphon-Chondrites遗迹组构;(2)对比南海北部相似沉积环境9口钻井112个层位岩心和电成像图像上识别出的遗迹组构,二者有104个层位完全吻合,识别准确度可达92.9%(8个层位因电成像质量较差,识别结果不一致),说明基于岩心和电成像测井识别琼东南盆地松涛隆起三亚组遗迹组构结果可靠、效果良好。结论结论该项研究对分析研究区储层的(古)沉积环境、预测其分布规律,揭示(古)生物对油气储层的改造机制具有重要意义。

Objectives In order to ascertain the development characteristics of ichnofabric of Sanya Forma‐tion in Songtao Uplift in Qiongdongnan Basin,and to explore the hydrocarbon geological significance of these ichnofabrics, Methods on the basis of detailed observation and description of the development charac‐teristics of trace fossils and host sediments on the core of representative coring wells,ichnofabrics were iden‐tified.By calibrating the depth of the core and electrical imaging logging,the calibration of electrical imag‐ing log images with core was achieved.Then,the response characteristics of ichonfabrics to electrical imag‐ing logging were carefully analyzed,and reference image templates for the identification of ichnofabrics us‐ing electrical imaging log were established. Results (1)Five kinds of ichnofabrics were identified on the core and electrical imaging log images of the study area:Phycosiphon⁃Chondrites ichnofabric,Phycosiphon-Planolites ichnofabric,Planolites-Thalassionides ichnofabric,Palaeophycus ichnofabric and Ophiomorpha-Thalassionides ichnofabric.By synthesizing the sedimentological and ichnological properties of 5 types of ich‐nofabrics,their sedimentary environment formed was interpreted.(2)According to the comparison between the ichnofabrics identified from the cores and the electrical imaging images of 112 horizons in 9 wells in Qiongdongnan Basin,104 horizons were completely consistent,and the identification accuracy could reach 92.9%,while 8 horizons were inconsistent due to poor electrical imaging quality.It was reliable and effective to identify ichnofabrics of Sanya Formation in Songtao Uplift of Qiongdongnan Basin based on core and elec‐trical imaging logging images. Conclusions This study was of great significance for analyzing the deposi‐tional environment and predicting the distribution pattern of reservoirs in the study area,revealing the modi‐fying effect of ichnofabric on hydrocarbon reservoirs,and promoting increased hydrocarbon storage and pro‐duction,as well as enhancing recovery in the study area.

国家自然科学基金资助项目(42272178);河南省自然科学基金资助项目(202300410185);中海油田服务股份有限公司重点科技项目(G2217C-0414T285)