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综合分析砂岩储集层沉积微相、碎屑组分、粒级及高温强超压特殊成岩环境等与储集层物性的关系,研究莺歌海盆地中央底辟带东方区DF13-1构造上中新统黄流组一段储集层特征及其影响因素。来自西部昆嵩隆起物源区的海底扇水道岩屑石英极细—细粒砂岩沉积厚度大、分布面积广,储集性能好,是东方区黄流组一段的主力储集层。高温热流体活动和强超压的存在是黄流组一段保留较好储集层物性的主要成岩因素:高温热流体活动促进了有机质生烃和黏土矿物的转化,在转化过程中析出的酸性水以及富含CO2的热流体对储集层产生溶蚀,形成次生孔隙发育带;强超压拓宽了生油窗范围,增加溶蚀作用的时间和强度,使次生孔隙带发育在更深的地层中。此外,强超压还有利于孔隙的保存。东方区粉砂岩、极细砂岩、细砂岩储集层经济基底大约为3 100 m、3 900 m和5 000 m,黄流组一段极细—细砂岩在目前埋深(2 600～3 500 m)条件下,可以形成天然气优质储集层。
Based on the analysis of sedimentary microfacies, detrital components, grain size, special high diagenesis overpressure and special diagenesis environment of sandstone reservoirs and reservoir physical properties, the study on the structure of DF13-1 in the eastern part of the central part of the central part of the Yinggehai Basin Characteristics and Influencing Factors of the First Member of Miocentrain Huangliu Formation. The submarine fan-rock cuttings from the KunSong uplift source area in west China are characterized by large thickness, wide distribution area and good reservoir performance. They are the main reservoirs of the first member of the Huangliu Formation in the Eastern Region. The existence of high-temperature hydrothermal fluid and strong overpressure are the main diagenetic factors in reservoiring reservoirs of the first stage of the Huangliu Formation. The activities of high-temperature hydrothermal fluids promote the conversion of organic matter and clay minerals, and the precipitation of acidic water And the CO2-rich thermal fluid eroded the reservoir to form secondary pore development zones. Strong overpressure broadened the oil window and increased the time and intensity of dissolution so that the secondary pore developed in the deeper strata . In addition, strong overpressure is also conducive to the preservation of the pores. The economic base of the siltstone, ultra-fine sandstone and fine sandstone reservoirs in Dongfang District is about 3 100 m, 3 900 m and 5 000 m. The first basal segment of the Huangliu Formation is currently buried at depths of 2,600-3,500 m ) Conditions, can form a high-quality natural gas reservoir.