摘要
义东油田位于济阳坳陷沾化凹陷义东断裂带 ,该油田大 81 4块沙四段咸化湖泊生物礁复合体自下而上可分为 5个小型礁体 ( 2个藻礁 ,3个藻礁丘体 )。根据岩心观察、镜下鉴定和钻井等资料 ,主要有 3种岩石类型 :白云岩类是下部藻礁的主体 ,灰岩类是礁丘相的主体 ,其它岩类 (主要为碎屑岩类和盐岩 )分布局限 ;储集空间主要有 7种类型 (粒间孔隙、粒内孔隙、铸模孔隙、生长骨架孔隙、角砾间孔隙、晶间孔隙和构造裂缝 )。该生物礁复合体位于凸起边缘的断阶带平台 ,发育于有陆源碎屑供给的半清水水域 ,紧邻深水区。礁体形成后经历了深埋藏成岩期 ,对储集空间演化影响最大的成岩作用是白云石化作用、溶解作用、新生变形作用和胶结作用。预测大 81 2 2 1井区及附近的 2个枝管藻白云岩礁体为最有利的勘探目标 ,义东 2 2井附近生物礁也有良好的勘探前景。图 4参
In Block Da 81 4 of the Yidong area, Jiyang Depression, bioherms in the Sha 4 Member of the Shahejie Formation were formed in haline lacustrine environment on ramp margin. Five small scale bioherms (2 algal reefs and 3 algal knolls) are in vertical succession. Three major lithofacies associated with bioherms are: ①dolomites dominate the lower algal reefs; ②limestones comprise the majority of the algal knolls; and ③limited presence of clastics and evaporates. Seven types of porosities are observed. They are inter particle, inter granular, mold granular, growth skeletal granular, breccias granary, inter crystal granular, and structure fissure. The bioherms have undergone deep burial, dolomization, dissolution, deformation, and cementation, all being domiant diageneses affecting reservoir porosity. The dolomized branching algal reefs in Block Da 81 4 and nearby blocks are probably most promising exploration targets.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2003年第4期43-46,共4页
Petroleum Exploration and Development
