Distribution characteristics and exploration strategy of middle-shallow lithologic reservoirs in offshore mature exploration areas: a case study on Huizhou sag in the Pearl River Mouth Basin

doi:10.3969/j.issn.1672-7703.2018.06.002

Abstract

Abstract: It is quite difficult to explore offshore oil and gas reservoirs, and especially the offshore lithologic reservoirs in middle and shallow layers. And the exploration difficulties are mainly how to identify and describe the lithologic pinch-out boundary when the superimposed relationship of sandbodies is diverse and the resolution of conventional seismic profile is lower and how to discover large-scale reserves of lithologic reservoirs practically and effectively. Huizhou sag in the Pearl River Mouth Basin is a relatively mature exploration area, and it was taken as an example to systematically summarize the distribution characteristics of middle-shallow lithologic reservoirs in this area. And accordingly the exploration strategy for lithologic reservoirs in mature explorations areas was put forward. The exploration practice of lithologic reservoirs in Huizhou sag shows that they are usually distributed near the hydrocarbon rich sub-sags, co-existed with structural reservoirs controlled by marine flooding mudstone, and accumulated in the main hydrocarbon migration paths. Based on these characteristics, the exploration strategy of integrated exploration and development was put forward according to the overall-planning exploration principle with geology, geophysics and economic evaluation as a whole. This exploration strategy takes high-quality seismic data as the base, detailed geological cognition as the guidance and advanced geophysical technology as the method. It provides the important guidance for the discovery of new lithologic reservoirs in the periphery of Huizhou 21-A and Huizhou 25-B oil fields in Huizhou sag.

Key words: Huizhou sag, offshore mature exploration area, lithologic reservoir, distribution characteristics, exploration strategy, Pearl River Mouth Basin

CLC Number:

Mi Lijun, Zhang Xiangtao, Ding Lin, Du Jiayuan, Zhang Shaochen. Distribution characteristics and exploration strategy of middle-shallow lithologic reservoirs in offshore mature exploration areas: a case study on Huizhou sag in the Pearl River Mouth Basin[J]. China Petroleum Exploration, 2018, 23(6): 10-19.

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