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- Title
Geological characteristics and hydrocarbon accumulation of Nanpi Slope in the Cangdong Sag,Bohai Bay Basin.
- Authors
Zhou Li-hong; Shi Xiao-song; Guan Quan-sheng; Yang Peng; Lin Ling; Wu Jia-peng
- Abstract
With increasing exploration degree of hydrocarbon reservoirs in the forward structural belt,the large-scale discovery of Tibet entered a bottleneck. The exploration idea must change from structural reservoir exploration to slope continuous reservoir exploration. By analyzing fine structure interpretation,sedimentary microfacies division,source rock characteristics and regional sand control mechanism of Nanpi Slope in the Cangdong Sag,we get the understanding of the geological features of the Nanpi Slope and the model of oil and gas accumulation. The study shows that the Nanpi Slope is a broad and gentle inherited slope,and the structure shows three characteristics of high,medium and low slopes. The Ek2 formation develops Braided River Delta in Paleogene,shallow delta is developed at the bottom of Ek1 formation,and alluvial fan sedimentary environment is developed in the upper part. The environment development is favorable for large areas of sand bodies. High quality source rocks developed in the Ek2 formation,with high hydrocarbon generating intensity. Based on the matching of structure,sand body,source rock and known reservoir,two reservoir forming combination systems of self-source accumulation and other source accumulation are formed.In the effective oil source rock range,the conventional reservoir accumulated in the middle slope main sand body area,the low slope and the distal fine-grained sedimentary rock overlap with oil shale to form tight oil in Ek2. In oil and gas system,conventional oil and tight oil overlap to form a model of continuous accumulation. Under the control of Ek2 effective hydrocarbon source rocks,Ek1 formed a composite oil accumulation model of “bottom sand group,near source,large area filling,upper succession fault and network communication”.
- Subjects
HYDROCARBONS; GEOLOGICAL basins; RESERVOIRS; SEDIMENTARY rocks; NATURAL gas
- Publication
Natural Gas Geoscience, 2017, Vol 28, Issue 9, p1
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2017.08.017