摘要
位于海南省北部 FS 凹陷的下第三系涠洲组、流沙港组,分别属于河流—泛滥平原—浅湖相和河流—三角洲—中深湖相的沉积。该凹陷沉积的碎屑岩具有矿物成分成熟度低和结构成熟度低的特征,所以其埋藏成岩作用十分强烈。成岩现象主要表现为压实、压溶作用,菱铁矿,含铁方解石和铁白云石胶结作用和溶解作用。涠洲组、流沙港组的储集性能严格地受到以上成岩现象的控制,使原生孔隙遭受到破坏,而溶解作用产生了一定量的次生孔隙。本文着重对该区下第三系涠洲组、流沙港组的沉积特征、成岩特征、孔隙类型和孔隙演化方面进行论述,指出其储层性能受到成岩作用的严格控制。
Lower Tertiary Weizhou and Liushagang formations in FS depression, northern part of Henan province are deposited in river-flooded plain-shallow lake and river-deltaic-medium deep lake phases,respectively.The clastic rocks in this depression are characterized by low maturation of the mineral composition,and low maturation in structure,thus diagenesis due to burial is very strong.Diagenesis is mainly appeared as compaction,pressure-solu- tion,as well as the cementation and dissolution of siderite,Fe-calcite and ankerite. Due to the above mentioned diagenesis,the reservoir characteristics of Weizhou and Liushagang formations are strictly controlled by these diagen- etic actions.Compaction,pressure-solution as well as the cementation of siderite,Fe-calcite and ankerite will destroy the primary pores,while dis- solution will produce secondary pores to a certain extent. This paper emphasizes on the depositional,diagenetic characteristics, types of pore structure and the evolution of the pore system of these two formations.Finally it is pointed out that the reservoir characteristics of these two groups are controlled strictly by diagenesis.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1992年第3期18-25,共8页
Petroleum Exploration and Development
