Abstract:

It is demonstrated that the Paleogene reservoir came through compaction, cementation and other diagenesis by the analysis of lab data.The mechanical compaction was main one, not the compaction-dissolution. The cementaion involved quartz growth, carbonate and clay mineral formation.The carbonate cements formed in two fifferent phases,the clay calcite was developed in the early phase on the shallow strata, but the crystal calcite on the middle-deep strata.The dissolution of calcite and feldspar was obvious.The pore evolution went through primary to secondary pores.The pore size was affected by the dissolution of calcite and feldspar,as well as cementation of carbonate.The early cementation of calcite was favorable for the late the development of secondary pores.There was a different depth of secondary pore development in different regions in Jiyang sag.From the west to the east in Jiyang sag, the depth of secondary pore growth was increased,that was 1500-2400m in western Huimin depression, 1650-2450m in middle Dongying depression,then 2200-2700m in Chezhen depression and 2300-3500m in Zhanhua depression ,the characteristics of secondary pore distribution was influnced by the migration of sedimentation center.

摘要：

大量的储层分析化验资料研究表明，济阳坳陷古近系砂岩储层经历了压实、胶结等多种成岩作用。压实作用以机械压实为主，压溶作用较少。胶结作用主要有十分普遍的石英次生加大胶结、碳酸盐胶结、粘土矿物胶结。碳酸盐胶结物有早、晚两期，早期泥晶方解石主要分布在浅层，连晶方解石充填的深度分布范围大，中深部最为发育。溶蚀作用主要有碳酸盐胶结物、长石颗粒和少量岩屑溶蚀。储层孔隙经历了由原生到次生的演化过程，在成岩演化过程中，长石的溶蚀作用、碳酸盐矿物的沉淀与溶解作用是影响孔隙大小的关键因素，早期方解石的胶结有利于后期次生孔隙的发育。不同凹陷次生孔隙发育的深度不同。在济阳坳陷西部的惠民凹陷次生孔隙主要发育于1500-2400m深度，向东至东营凹陷则主要发育于1650-2450m，再向东到沾化凹陷为2300-3500m，车镇凹陷为2200-2700m。从西向东、由南向北次生孔隙的发育深度逐步增大是受盆地沉积沉降中心的迁移规律控制的。