CAJ | 학술논문

东营凹陷下第三系埋深大于3 000 m的深部碎屑岩储层普遍发育2～4个次生孔隙带，Φ=10%～30%，K=0.1×10\{-3\} μm2～30×10\{-3\} μm2，为中孔低渗低孔低渗油气储层。综合有机质热演化过程、成岩作用和构造断裂等分析，认为东营凹陷埋深大于3 000 m碎屑岩地层中，第一、二个次生孔隙带埋深在3 000 m～3 900 m之间，其形成主要与有机质成熟过程释放有机酸对长石等颗粒的溶解有密切关系，在深大断裂附近储层同时受到大气淡水的影响，而深陷带包裹于暗色泥岩中的浊积砂岩的次生孔隙发育情况还与泥质岩异常压力带有关；第三个次生孔隙带埋深一般为3 900 m～4 300 m，主要成因于粘土矿物转化造成的还原环境，同时受到硫酸盐热化学氧化还原反应的影响。这三个次生孔隙发育带对储集油气有效。第四个孔隙发育带埋深在4 700 m以下，主要是构造成因的微裂缝，较难成为有效的油气储层。
동영요함하제삼계매심대우3 000 m적심부쇄설암저층보편발육2～4개차생공극대，Φ=10%～30%，K=0.1×10\{-3\} μm2～30×10\{-3\} μm2，위중공저삼저공저삼유기저층。종합유궤질열연화과정、성암작용화구조단렬등분석，인위동영요함매심대우3 000 m쇄설암지층중，제일、이개차생공극대매심재3 000 m～3 900 m지간，기형성주요여유궤질성숙과정석방유궤산대장석등과립적용해유밀절관계，재심대단렬부근저층동시수도대기담수적영향，이심함대포과우암색니암중적탁적사암적차생공극발육정황환여니질암이상압력대유관；제삼개차생공극대매심일반위3 900 m～4 300 m，주요성인우점토광물전화조성적환원배경，동시수도류산염열화학양화환원반응적영향。저삼개차생공극발육대대저집유기유효。제사개공극발육대매심재4 700 m이하，주요시구조성인적미렬봉，교난성위유효적유기저층。
There are 2～4 zones of secondary pores in clastic rock of deep formation buried deep than 3 000 m in Dongying Sag with Φ\{max\}=10%～30%,K\{max\}=0.1×10\{-3\} μm2～30×10\{-3\} μm2.It is considered that changes of formation water chemistry caused by organic thermal evolution,clay minerals transformation and thermochemical sulfate reduction are the important factors influencing diagenesis and porosity evloution on the basis of synthetic analysis of organic thermal evloution,diagenesis and faulting of clastic rock in deep formation in the sag.The first and second zones of secondary pore of 3 000 m to 3 900 m in depth were controlled by organic acids dismissed during organ′s maturing ,fresh water permeating along the deep fault and abnormal pressure in argillite.At the depth ranging from 3 900 m to 4 300 m，the third zone of secondary pore was mainly related to clay minerals transformation and thermo-chemical sulfate reduction.These three secondary porosity zones are effective reservoir spaces.There were crevices in the forth zone of secondary pores which are unfavourable to the accumulation of oil.