琼东南盆地宝岛凹陷北斜坡油气运聚模式探讨

基于琼东南盆地宝岛北斜坡近几年的勘探资料和前人研究成果，通过对该区已钻遇主要目的储层的定量颗粒荧光等
实验分析，结合油气地化特征、断层活动规律等，探讨研究区油气分布特征和运聚模式。结果表明：宝岛北斜坡主要目的
层三亚组储层属于中孔低渗储层，泥质含量高，储层非均质性较强；该储层普遍含气，油气藏形成时间晚，储层颗粒表面
吸附烃类普遍较高，颗粒内烃类含量非常低；而靠近凹陷的深层陵水组油气藏形成时间早，但后期遭受破坏，储层颗粒表
面吸附烃类普遍较低，颗粒内烃类含量较高；宝岛凹陷生成油气向北运移能力有限，主要向靠近凹陷的宝岛B区供烃，对
松涛凸起以北的宝岛A区油气贡献小；宝岛A区油气主要为其下覆渐新统海相烃源岩所生油气，通过广泛发育的断层垂向
运移而形成的，成藏时间晚，油气性质与其他地区差异明显。

Oil and Gas Migration Model of the Northern Slope of the Baodao Sag,the Qiongdongnan Basin

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