Comprehensive Prediction of Dominant Reservoirs in the Guantao Formation Volcanic Rock Reservoir in NanPu Oilfield

Abstract The Guantao Formation volcanic rocks are nearly 200m thick in the No. 1 structural belt of Nanpu Sag. The recognition degree of volcanic lithology and rock equality is low. The reservoir characteristics and accumulation rules of volcanic reservoir are not clear. The features of volcanic reservoir and its accumulation laws are not well - understood. In order to offer a basis for achieving large - scale production, a comprehensive assessment of the favorable volcanic rock reservoirs should be conducted. Analysis is made on the key factors controlling volcanic reservoirs by comprehensively researching lithology, lithofacies, physical properties of reservoirs, reservoir spaces and oil content, etc. The differential enrichment laws of volcanic oil and gas in Nanpu No.1 structural belt are summarized as volcanic crater control area, oil source fault control zone, and dominant reservoir control reservoir. By superimposing multiple maps such as structure, lithology, lithofacies, reservoir physical property classification plan, gas logging ratio, gas logging thickness contour map, it is optimized that the volcanic reservoir near the crater and oil source fault are developed as favorable reservoirs of Guantao Formation volcanic reservoir in No. 1 structural belt of Nanpu Sag. The oil test results show that the evaluation results are reliable. This method is of great value in terms of application and popularization for predicting the dominant reservoirs within volcanic reservoirs. Meanwhile, it has some guiding value for the exploration and development of Guantao Formation volcanic rocks in Nanpu Sag.