Journal
JOURNAL OF EARTH SCIENCE
Volume 23, Issue 3, Pages 253-267Publisher
CHINA UNIV GEOSCIENCES, WUHAN
DOI: 10.1007/s12583-012-0251-8
Keywords
petroleum charge; oil leakage; source-rock correlation; Bohai Bay basin
Categories
Funding
- National Natural Science Foundation of China [90914006]
- Program for Changjiang Scholars and Innovative Research Team in the University [IRT0658]
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This paper discusses origin and charging histories of the Bozhong (aecurrency signa) 25-1 field (BZ25-1) in the Bozhong sub-basin, Bohai (aecurrency signae mu center dot) Bay basin. Petroleum is contained in both Paleogene and Neogene reservoirs in the BZ25-1 field. The origin of the field was studied using biomarker distributions for 61 source rock samples and 34 oil samples. Oil in the Paleogene reservoirs was derived from the third member (Es (3), 43.0-38.0 Ma in age) of the Eocene Shahejie (ae(2)(TM) ae(23)eu) Formation, whereas oil in the Neogene reservoirs was a mixtures of oil generated from the third member and the first member (Es (1), 35.8-32.8 Ma) of the Eocene Shahejie Formation. Charging of the shallow Neogene reservoirs was dynamic, probably ongoing, which was a combined result of the existence of active source rocks, the development of overpressure and the fault reactivation since about 5.1 Ma. On the contrary, the deep Paleogene reservoirs experienced intensive oil leakage as indicated by the high GOI (grains-containing-oil-inclusions) values (up to 30%) for samples below the present-day oil-water contact. Part of the oil that leaked from the Paleogene reservoirs re-accumulated in the shallow Neogene reservoirs. The variation of oil origins within the BZ25-1 field, and the dynamic petroleum charging into the shallow Neogene reservoirs and leakage from the deep Paleogene reservoirs have important implications for petroleum exploration.
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