渤海湾盆地莱州湾凹陷W16构造热流体活动对储层改造作用  

Effect of Thermal Fluid Activity on Reservoirs in W16 Structure of Laizhou Bay Sag,Bohai Bay Basin

作　　者：杜晓峰 张尚锋[3] 官大勇 王雅宁[3] 宿雯 苏奥 Du Xiaofeng;Zhang Shangfeng;Guan Dayong;Wang Ya’ning;Su Wen;Su Ao(China National Offshore Oil Corporation Research Institute Ltd.,Beijing 100028,China;Tianjin Branch of China National Offshore Oil Corporation,Tianjin 300459,China;Shool of Geosciences,Yangtze University,Wuhan 430100,China)

机构地区：[1]中海油研究总院有限责任公司,北京100028 [2]中海石油(中国)有限公司天津分公司,天津300459 [3]长江大学地球科学学院,湖北武汉430100

出　　处：《地球科学》2024年第10期3459-3470,共12页Earth Science

基　　金：国家自然科学基金项目(No.41472098)。

摘　　要：渤海湾盆地莱州湾凹陷古近系沙河组混积岩发育的优质储层的成因机理尚不明确.采用流体包裹体测温、镜质体反射率以及岩石学观察,结合实测物性,研究了沙河街组湖相碳酸盐岩-陆源碎屑岩-火山岩所构成的复杂混积背景下的热流体活动对储层改造作用.异常高的包裹体均一温度和镜质体反射率以及包裹体的高古盐度指示深部热卤水的活动.储层广泛存在酸性溶蚀:凝灰岩和泥晶白云岩填隙物以及长石颗粒等存在大量次生溶蚀孔,且常见粒缘缝,这可能是岩浆活动驱动的高压酸性热液入侵造成的淋滤和水力破裂.流体温压下降,热液矿物沉淀导致了储层强烈致密化.总体上,热液对该区储层改造可产生建设性和破坏性两种效应,在一定程度上强化了储层物性的空间分异.Genetic mechanism of the high-quality reservoirs developed by the Paleogene Shahejie Formation mixed rock in the Laizhouwan Sag,Bohai Bay Basin is still unclear.Based on fluid inclusion,vitrinite reflectance and petrological observation,combined with measured physical properties,it studies the effects of thermal fluid activities on reservoir under the complex mixing background of lacustrine carbonate rocks,terrigenous clastic rocks and volcanic rocks in the Shahejie Formation.The high homogenization temperatures of fluid inclusions,vitrinite reflectance,and paleo-salinity of fluid inclusions indicate the activity of deep hot brines.Acid dissolution exists widely in the reservoir:There are a large number of secondary dissolution pores in tuff,micrite dolomite interstitials and feldspar grains,and the common grain margin fractures,which may be caused by the intrusion of high pressure acid hydrothermal solution driven by magmatic activity.As the fluid temperature pressure drops,hydrothermal mineral precipitation also resulted in a strong and dense reservoir.In general,hydrothermal can produce both constructive and destructive effects on the reservoir,which strengthens the spatial differentiation of reservoir physical properties to a certain extent.

关 键 词：热流体 成岩作用 优质储层 莱州湾凹陷 石油地质学 

分 类 号：P512.2[天文地球—地质学]