Quantitative prediction model for the depth limit of oil accumulation in the deep carbonate rocks:A case study of Lower Ordovician in Tazhong area of Tarim Basin  

作　　者：Wen-Yang Wang Xiong-Qi Pang Ya-Ping Wang Zhang-Xin Chen Fu-Jie Jiang Ying Chen 

机构地区：[1]State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China [2]State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing,102249,China [3]College of Geosciences,China University of Petroleum(Beijing),Beijing,102249,China [4]Research Institute of Exploration and Development,PetroChina Southwest Oil&Gas Field Company,Chengdu,610041,Sichuan,China [5]Chemical and Petroleum Engineering,Schulich School of Engineering,University of Calgary,Calgary,T2N 1N4,Canada

出　　处：《Petroleum Science》2024年第1期115-124,共10页石油科学（英文版）

基　　金：This work was supported by the Beijing Nova Program[Z211100002121136];Open Fund Project of State Key Laboratory of Lithospheric Evolution[SKL-K202103];Joint Funds of National Natural Science Foundation of China[U19B6003-02];the National Natural Science Foundation of China[42302149].We would like to thank Prof.Zhu Rixiang from the Institute of Geology and Geophysics,Chinese Academy of Sciences.

摘　　要：With continuous hydrocarbon exploration extending to deeper basins,the deepest industrial oil accumulation was discovered below 8,200 m,revealing a new exploration field.Hence,the extent to which oil exploration can be extended,and the prediction of the depth limit of oil accumulation(DLOA),are issues that have attracted significant attention in petroleum geology.Since it is difficult to characterize the evolution of the physical properties of the marine carbonate reservoir with burial depth,and the deepest drilling still cannot reach the DLOA.Hence,the DLOA cannot be predicted by directly establishing the relationship between the ratio of drilling to the dry layer and the depth.In this study,by establishing the relationships between the porosity and the depth and dry layer ratio of the carbonate reservoir,the relationships between the depth and dry layer ratio were obtained collectively.The depth corresponding to a dry layer ratio of 100%is the DLOA.Based on this,a quantitative prediction model for the DLOA was finally built.The results indicate that the porosity of the carbonate reservoir,Lower Ordovician in Tazhong area of Tarim Basin,tends to decrease with burial depth,and manifests as an overall low porosity reservoir in deep layer.The critical porosity of the DLOA was 1.8%,which is the critical geological condition corresponding to a 100%dry layer ratio encountered in the reservoir.The depth of the DLOA was 9,000 m.This study provides a new method for DLOA prediction that is beneficial for a deeper understanding of oil accumulation,and is of great importance for scientific guidance on deep oil drilling.

关 键 词：Deep layer Tarim Basin Hydrocarbon accumulation Depth limit of oil accumulation Prediction model 

分 类 号：P618.13[天文地球—矿床学]