摘要
利用铸体薄片、扫描电镜、X-衍射、物性分析、高压压汞等分析化验资料,对白豹地区长81储层成岩作用和成岩相进行了分析研究。白豹地区长81储层砂岩经历了早成岩阶段A、B期和中成岩阶段A、B期的成岩演化过程,主要发育机械压实、胶结、溶蚀及交代成岩作用。其中压实作用和胶结作用是孔隙度降低的主要原因,分别造成了18.6%和13.3%的原生孔隙度损失,溶蚀作用形成的次生孔隙在一定程度改善了储层物性。研究区发育了5种不同成因类型的成岩相带,绿泥石膜胶结粒间孔相物性、含油性最好,为研究区最有利的成岩相带;水云母胶结粒间孔相为次有利成岩相带;长石溶蚀相也为研究区比较有利的成岩相带;压实压溶致密相和碳酸盐胶结致密相不利于储层发育。
Diagenesis and diagenetic facies of Chang-81 reservoir in Baibao area are studied by application of thin sections,SEM,X-ray diffraction,physical properties analysis,high pressure injection and other analytical testing information.The sandstones of Chang-81 reservoir in Baibao area have experienced diagenetic evolution processes of A and B phases during early diagenesis,and A,B phases during middle diagenesis,and experienced mechanic compaction,cementation,dissolution and metasomatism.Decrease of sandstone porosity is mainly caused by compaction and cementation,which contribute 18.6% and 13.3% to the loss of primary pores respectively.Secondary pores resulted from dissolution improved the property of reservoir to some extent.There are 5 diagenetic facies zones with various genetic types developed in the study area,and physical property and oil bearing of chlorite cementation intergranular pore is best,which is the most favorable diagenetic facies zone.The hydromica cementation intergranular pore is the second favorable diagenetic facies zone.The feldspar dissolution is the third favorable diagenetic facies zone in the study area.However,compaction pressure solution diagenetic facies and carbonate cementation diagenetic facies are disadvantageous to the development of reservoir.
出处
《地质科技情报》
CAS
CSCD
北大核心
2013年第4期31-37,共7页
Geological Science and Technology Information
基金
国家科技重大专项"大型油气田及煤层气开发"(2011ZX05044)
关键词
成岩作用
成岩相
长81
延长组
白豹地区
diagenesis
diagenetic facies
Chang-81 reservoir
Yanchang Formation
Baibao area
