Discovery and exploration significance of large condensate gas fields in BZ19-6 structure in deep Bozhong sag

doi:10.3969/j.issn.1672-7703.2019.01.005

Abstract

Abstract: The deep formation of Bozhong sag in the Bohai sea area has favorable geological conditions for the formation of natural gas fields. BZ19-6 large-scale condensate gas field is the largest natural gas field discovered so far in Bohai Bay Basin, with reserves exceeding 100 billion cubic meters. Based on a large number of core, thin section, well logging and geochemical data, the deep gas reservoir-forming conditions in Bozhong 19-6 structure are systematically analyzed. It is proved that the deep layer of Bozhong sag has great potential for generation of natural gas and is the basis for the formation of large-scale condensate gas fields. The extremely thick overpressure mudstones of Dongying Formation and Shahejie Formation with stable regional distribution provide good sealing conditions for the preservation of large condensate gas fields. It is the first time to discover huge thick fractured-porous sandy conglomerate reservoir in Kongdian Formation of Paleogene in Bohai Bay Basin, which breaks through the forbidden area of searching for thick sandy conglomerate reservoir in depression area and greatly expands the exploration field of Paleogene oil and gas. Based on the analysis of the formation mechanism of high quality reservoirs in Archean deep buried metamorphic rock buried hills, it is proposed that the key to the formation of high quality reservoirs in metamorphic rocks is the development of large-scale fracture systems and dynamic fracture zones in buried hills caused by multi-stage dynamic fragmentation. These results have guided the discovery of large-scale condensate gas fields in Bozhong 19-6 structure, contributed to the breakthrough in natural gas exploration in Bohai Sea, and have important guiding significance for deep gas exploration in Bohai Bay Basin.

Key words: Bohai Sea, Bozhong sag, BZ19-6 large condensate gas field, glutenite, metamorphic rock, gas exploration

CLC Number:

Shi Hesheng, Wang Qingbin, Wang Jun, Liu Xiaojian, Feng Chong, Hao Yiwei, Pan Wenjing. Discovery and exploration significance of large condensate gas fields in BZ19-6 structure in deep Bozhong sag[J]. China Petroleum Exploration, 2019, 24(1): 36-45.

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