Geological Structure and Exploration Potential of Tanghe Low Uplift in Nanxiang Basin

doi:10.11885/j.issn.1674-5086.2020.05.22.01

Abstract

Abstract: Tanghe Low Uplift is a secondary positive structural unit separating Biyang Depression and Nanyang Depression in Nanxiang Basin. The study of its geological structure is of great significance to the exploration of petroleum in this area and to the analysis of the structural-sedimentary filling relationship between Biyang and Nanyang oil-rich depressions. Based on seismic, well logging and geochemical data, we analyzes the stratigraphic distribution, structural characteristics, formation and evolution, genetic mechanism of Tanghe Low Uplift, and discusses its petroleum exploration potential. The results show that the strata developed from the bottom to the top are Yuhuangding Formation, Dacangfang Formation, Hetaoyuan Formation, Fenghuangzhen Formation and Pingyuan Formation. The structure is divided into East and West blocks, which is a "Horst like" structure composed of slope zones of Nanyang and Biyang depressions separated by Tonghejie Fault; the structure is divided into North and South zones, in the form of multiple half grabens. According to the balanced geological section, the tectonic evolution of the area is divided into four stages, namely, the unified subsidence stage, the differential subsidence stage, the compression setting stage and the depression stage. The genetic mechanism of low uplift is closely related to the differential activities of boundary faults under the transformation of regional tectonic stress field. Tanghe Low Uplift has favorable conditions for hydrocarbon supply of multiple sags, effective reservoir development of multi-layer system, long-term and high-efficient transport system, vertical superposition of multiple types of traps, and has great petroleum exploration potential.

Key words: Tanghe Low Uplift, stratigraphic distribution, structural features, formation and evolution, exploration potential

CLC Number:

TE122

LI Zhi, LI Teng, ZHU Yan, HE Dengfa, LI Yan. Geological Structure and Exploration Potential of Tanghe Low Uplift in Nanxiang Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(5): 35-46.

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