New geological understandings and prospecting breakthrough in slope zone of southern Liaoxi uplift

doi:10.3969/j.issn.1672-7703.2019.04.005

Abstract

Abstract: Slope zone is a significant area for prospecting oil and gas, whereas there is no commercial discovery in the slope zone of southern Liaoxi uplift through many years of exploration. Using a large number of core, well logging, seismic as well as laboratory data, critical questions constricting the oil and gas exploration in the slope zone of the Liaoxi uplift are systematically analyzed. The study result reveals that: (1) According to the concealed strike-slip fault interpretation model, many large-scale structural trap groups were reconfirmed in southern Liaoxi uplift. (2) The thick high-quality reservoir of the mixed beach bar in the Shahejie Formation breaks through the traditional understanding of thin-layer reservoir, laying a foundation for large-scale oil and gas reserves discovery in this formation. (3) Structural-lithological process controlled the development of high-quality reservoir in Mesozoic and formed the porous-fractured reservoir in LD25-A structure. (4) The over-pressure sealing and efficient transporting pathway both decide the convergence and accumulation of oil and gas in the slope zone. These innovative geological understandings have guided the discovery of LD25-A light oil field with high yield and high abundance, contributed to the breakthrough in the slope zone of the Liaoxi uplift, and have important guiding significance for prospecting the slope zone in the Bohai Bay Basin.

CLC Number:

Xue Yongan, Zhang Xintao, Niu Chengmin. New geological understandings and prospecting breakthrough in slope zone of southern Liaoxi uplift[J]. China Petroleum Exploration, 2019, 24(4): 449-456.

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