J4 ›› 2014, Vol. 20 ›› Issue (4): 602-.
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ZHANG Xinshun, HUANG Zhilong, FAN Caiwei , WU Hongzhu
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Abstract:
Based on the recent oil and gas exploration data of Baodao northern slope in the Qiongdongnan Basin and the analyses of target reservoir rocks of the Baodao northern slope, the oil-gas-bearing possibility was evaluated by quantitative grain fluorescence experiments. In combination with oil-gas charging time, stages of fault activity and some other geological background, oil-gas distribution characteristics of Baodao northern slope were analyzed. The results show that the target reservoir, i.e., the Sanya Formation, belongs to mid porosity and low permeability reservoir. Also, the pores are mainly intergranular and biological visceral pores, and the reservoir shows strong heterogeneity with high mud content. The oil and gas reservoirs of the Sanya Formation of Baodao northern slope formed very late. So the particle surface adsorbed hydrocarbon abundance of shallow Sanya Formation is prevalent high with low abundance of intragranular hydrocarbon. However, the oil and gas reservoirs of the Lingshui Formation, close to the Baodao sag, formed much earlier, but most of them were destroyed later. Therefore the particles of reservoirs have high abundance of intragranular hydrocarbon with low adsorbed hydrocarbon abundance. Because of the limited migration ability, the oil and gas generated from the Baodao Sag is mainly influenced the B area of Baodao northern slope and they have little contribution to the A area of Baodao northern slope, which is located at the northern part of the Songtao bulge. Through the widely developed faults, the oil and gas generated by the
Oligocene source rock migrated vertically and accumulated in the reservoir of the Sanya Formation very late. And the characteristics of the oil and gas are different from those of the oil and gas from other areas
Key words: quantitative grain fluorescence, oil-gas-bearing possibility, reservoir rock, accumulation model, Baodao northern slope; Qiongdongnan Basin
ZHANG Xinshun, HUANG Zhilong, FAN Caiwei , WU Hongzhu. Oil and Gas Migration Model of the Northern Slope of the Baodao Sag, the Qiongdongnan Basin[J]. J4, 2014, 20(4): 602-.
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URL: https://geology.nju.edu.cn/EN/
https://geology.nju.edu.cn/EN/Y2014/V20/I4/602