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为了阐明西湖凹陷中央反转构造带花港组储层物性演化规律,以南部和中部地区花港组为研究对象,依据铸体薄片、扫描电镜、X-衍射、高压压汞、镜质体反射率等手段,以储层物性和储盖组合研究为基础,结合埋藏史恢复,分析储层孔隙演化规律及其主控因素,认为不同储盖组合在埋藏史控制下经历不同的成岩演化过程,形成现今的储层特征.研究结果表明:南部地区远离早期沉降中心,缓慢沉降期原生孔隙保存,快速沉降期和构造抬升期溶蚀发育,稳定沉降期发育少量晚期胶结,压实损失孔隙度(Ф_(COM))、胶结损失孔隙度(Ф_(CEM))和溶蚀增加孔隙度(Ф_(DIS))分别为20.86%,7.65%和7.78%,相对浅埋及半开放成岩环境形成相对弱压实、弱胶结和强溶蚀常规-低渗储层;中部地区靠近早期沉降中心,缓慢沉降期压实较强,快速沉降期有利的储盖组合形成的欠压实超压抑制压实,构造抬升期发育不同程度溶蚀,稳定沉降期发育晚期胶结,花港组上段Ф_(COM),Ф_(CEM)和Ф_(DIS)分别为21.82%,9.01%和5.64%,花港组下段Ф_(COM),Ф_(CEM)和Ф_(DIS)分别为23.84%,9.05%和4.50%,相对深埋及封闭成岩环境形成相对强压实、强胶结和弱溶蚀的花港组上段低渗-致密储层和花港组下段致密储层.
In order to clarify the evolution of the physical properties of the Huagang Formation reservoir in the Central Reversed Tectonic Belt of West Lake Sag, taking the Huaguang Formation in the southern and central regions as the research object, according to the castings, scanning electron microscopy, X-ray diffraction, high pressure mercury intrusion, vitrinite reflectance Based on the study of reservoir property and reservoir-cap combination, combined with the recovery of burial history, the evolution law of the pore of reservoir and its controlling factors are analyzed. It is concluded that different reservoir-cap assemblages underwent different diagenetic evolution under the control of burial history, The results show that the south area is far away from the early subsidence center, the shallow subsidence period is the primary pore preservation, the rapid subsidence period and the tectonic uplifting period. During the stable subsidence period, a small amount of late cementation and compaction loss porosity (Ф_ (COM)), porosity (Ф_ (CEM)) and porosity (Ф_ (DIS)) are 20.86%, 7.65% and 7.78%, respectively. Relatively weakly compacted , Weak cementation and strong dissolution of conventional - low permeability reservoir; central area near the early settlement center, the slow subsidence compaction strong, rapid subsidence of the favorable reservoir cover combination of overcompacted overpressure suppression compaction, tectonic uplift (COM), Ф_ (CEM) and Ф_ DIS were 21.82%, 9.01% and 5.64%, respectively, in the upper reaches of Huagang Formation. The values of COM, (CEM) and Ф DIS (DIS) of 23.84%, 9.05% and 4.50%, respectively. The relatively deep-buried and closed diagenetic environments formed relatively strong compaction, strong cementation and weak dissolution of the upper Huayang Formation low permeability- Lower Huaguang Formation tight reservoir.