Genetic types and exploration field analysis of natural gas in Nanpu sag

doi:10.3969/j.issn.1672-7703.2017.06.003

Abstract

Abstract: The occurrence, geochemistry,genesis and distribution of the natural gas were studied for analysis of the natural gas exploration fieldsin the Nanpu sag. The Nanpu sag is rich in oil and gas resources, where at present, the primary exploration target is oil. Oil and gas resources have been found in the Guantao, Minghuazhen, Dongying and Shahejie Formations, pure gas and condensate gas are mainly distributed in the 1^st and 2^nd Members of the Dongying Formation, and solution gas is distributed in all formations. The discovered natural gas is mostly wet gas with a small amount of dry gas, which are mostly distributed in the Beipu Structure, the Nanpu 1 Structure, the Nanpu 2 Structure and the Nanpu 5 Structure. The first type of the natural gas is transitional, second humic and third sapropelic. These three types of natural gas show stronger tendency of vertical migration, especially the transitional and the sapropelic gas. The important oil and gas exploration fields in this sag include:the natural gas accumulation of the overflowing gas from shallow-middle continental oil pools, and the near-source tight sandstone gas pools, lithologic gas pools or light oil and gas pools in the deep layers and the slope of the Nanpu sag.Shallow gas is mainly transitional and local gas is sapropelic. Deep gas includes sapropelic, humic and transitional type.

Key words: natural gas genesis, transitional natural gas, humic natural gas, exploration field, Nanpu sag

CLC Number:

TE122.1

Gao Gang, Dong Yuexia, Yang Shangru, Zhao Zhongxin, Dong Yan, Gang Wenzhe. Genetic types and exploration field analysis of natural gas in Nanpu sag[J]. China Petroleum Exploration, 2017, 22(6): 16-26.

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