High-Precision Magnetic Anomaly and Geological Significance of Shale Gas in Upper Yangtze Region 2018 IFEDC

Abstract

The accumulation pattern of the marine shale gas in South China is different from that in North America. The former has generally thin reservoirs and complex preservation conditions, so it is difficult to make a fine description of the structural features of shale formations and to reflect accurately the distribution pattern of high-quality shale by using the conventional seismic exploration technology. Based on data processing such as data correction, reduction-to-pole of magnetic data, space transforming, derivative conversion, smoothing filter and regularization filter, the magnetic anomalies were observed and analyzed, and the regional geological structure is divided in detail. The magnetic substrate obtained is the magnetic interface of metamorphic rocks equivalent to the Middle Proterozoic top boundary, with a depth of 2–4 km, reflecting the structural morphology and undulating characteristics of the metamorphic crystalline basement. The low parts on the magnetic basement provide the formation and accumulation of the Late Permian-Early Jurassic shale gas in the basin, in which favourable exploration blocks could be found. The fault structure in the study area has two layers of structure in space. The matching relationship between the sedimentary cap fracture and the basement fault controls the spatial distribution of the dominant reservoir together. Our research can guide shale gas exploration and development in this area and balance the high upstream exploration cost, and continue to push the efficient shale gas exploration and development process in China.

Copyright 2018, Shaanxi Petroleum Society.

This paper was prepared for presentation at the 2018 International Field Exploration and Development Conference in Xi’an, China, 18–20 September, 2018.

This paper was selected for presentation by the IFEDC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC Committee and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC Committee, its members. Papers presented at the Conference are subject to publication review by Professional Committee of Petroleum Engineering of Shaanxi Petroleum Society. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of Shaanxi Petroleum Society is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC. Contact email: paper@ifedc.org.