Efficient exploration process and enlightenment of oil-rich sags in eastern China: a case study on the Boxing subsag in Jiyang depression

doi:10.3969/j.issn.1672-7703.2018.05.003

Abstract

Abstract: After more than 50 years of exploration and development in the Boxing subsag in the Jiyang depression, eight oil and gas fields such as Purification, Boxing and Jinjia were discovered, and their cumulative proven geological reserves exceed 4×10⁸ tons, but they are all highly explored. In the process of efficient exploration in the Boxing sag, advances of scientific and technological theory and transformation of exploration ideas have been the mainstream. For example, the slope-controlling sandstone theory greatly enhanced the confidence of finding oil in subsags, and realized the transfer from structural reservoirs to lithologic reservoirs in subsag belts; the focus on brackish lake basin and shallow-shore lake beach increased the confidence of subsags full of oil, and revealed that oil in the Boxing subsag should be full and continuous; the order and continuity of oil and gas distribution promoted the overall 3D exploration to multi-layer and multi-type reservoirs in the subsag, and a large number of "red-layer" oil and gas reservoirs and marginal stratigraphic reservoirs have been discovered, expanding the exploration field; at low oil prices, the concept of refined and efficient exploration can ensure the discovery of high-quality and producible reserves in the future.

Key words: efficient exploration, exploration enlightenment, oil-rich sag, Boxing subsag

CLC Number:

Zhang Yu, Qiu Yibo, Jia Guanghua, Liu Zhiyong, Han Min. Efficient exploration process and enlightenment of oil-rich sags in eastern China: a case study on the Boxing subsag in Jiyang depression[J]. China Petroleum Exploration, 2018, 23(5): 21-27.

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