辽河油田雷家地区沙四段储层特征及白云岩成因研究

雷家地区沙四段岩性主要包括白云岩、灰岩、泥岩及长石砂岩,白云岩主要为泥粉晶白云岩,灰岩主要有纹层状泥质灰岩和白云质灰岩,泥岩则以灰质或白云质泥岩为主;本区储集空间主要包括孔、洞、缝三大类,孔隙主要为晶间溶孔和溶蚀孔隙,部分井段有溶洞发育,而裂缝则为本区主要的储集空间,包括穿层裂缝、层内裂缝、顺层缝和微裂缝等;由于研究区沙四段具有盐度高、水体安静、强还原、弱碱性的沉积环境特征,因此本区白云岩成因主要为准同生白云作用、埋藏白云化作用和玄武岩淋滤白云化作用。

Leijia Rarion ES4 bed lithology mainly includes dolostone,limestone.mudstone and feldspar porphyry sandstone. Dolostone mainly includes Dolomite cement powder; limestone mainly includes Laminated Argillaceous limestone and Dolomitie limestone; mudstone mainly includes Dolomitic Mudstone. The reservoir space of Leijia Rarion mainly includes bore,hole and cracks. Bore mainly includes Intergranular Dissolution Porosity and Pore Solution. Cracks is the main reservoir space which includes Wear Layer Cracks.Layer Cracks.Bedding Joints and Micro--cracks. Because the rarion has the characteristic o~ high salinity,quiet water, strong reduction,alkalescent, the generation of dolomitite is White clouds with the role of quasi--health,burial of the role of clouds and leaching of basalt in the role of clouds.