| Author's Name: MA Xuefeng，YANG Dexiang, WANG Jian, CAO Lanzhu, TIAN Jianzhang, YU Yan, ZHONG Xuemei, LIU Haitao, HAN Qi |
| Institution: Huabei Oilfield Exploration and Development Research Institute |
| Abstract: |
| The Member-3 and the Member-1 of the Paleogene Shahejie Formation are the most important hydrocarbon source beds in Jizhong Depression of Bohai Bay Basin. It is proved that the patterns of “late source and early reservoir” and“self-generation and self-reservoir” are the two types of reservoir-forming assemblages with the largest discovered reserves and the richest oil resources. In recent years, it is showing so better exploration prospects in Jizhong Depression that important breakthroughs and discoveries have been made in fields of lithologic reservoir, buried-hill reservoirs and tight oil in the oil-rich troughs. In this paper, conventional and unconventional oil reservoir-forming conditions and main controlling factors are analyzed, multi-types of oil reservoir-forming patterns are setup and their enrichment rules are summarized. On this basis, suitable assessment methods and parameters are selected to estimate the oil resource potential,and the favorable exploration targets and prospects are selected. The results show that the amount of the conventional oil resource is 24.40×108 t, with the proved reserves accounting for 46%, and that of tight oil is 5.19×108 t. As remaining oil resources are still considerable, the exploration of structural-lithological reservoirs and hidden conventional reservoir in oil-enriched troughs and slopes would be continuously deepened, and the exploration of marl tight oil in Shulu Sag should be stably promoted, and the comprehensive evaluation for dessert area of tight oil should be strengthened. |
| Keywords: geological conditions; resource assessment; exploration potential; oil; oil-enriched trough; Jizhong Depression; Bohai Bay Basin |
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投稿时间：
2018-12-06 |
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