摘要
薄片分析表明文昌A凹陷珠海组二、三段主要孔隙类型为次生孔隙。综合利用扫描电镜、阴极发光、同位素、典型矿物识别等对次生孔隙的形成机制进行研究。结果表明存在4种溶蚀成因机制。扇三角洲沉积背景下方解石沉淀和溶蚀残余钾长石指示早期淡水溶蚀作用。两期油气充注确定了有机酸的溶蚀时间。利用重晶石和金红石确定了酸性热液溶蚀成因,利用取样资料和铁白云石分布确定了无机CO2溶蚀的成因。并根据以上成因机制预测次生孔隙的分布,认为南大断裂带和6号断裂带次生孔隙带发育,是文昌A凹陷下步深层低渗储层勘探的重点区带。
Thin section data showedthat secondary poresdominant in the zhuhai formation in wenchang A depression.The genetic mechanisms of secondary pore development werestudied using scanning electron,cathode luminescence,isotope,typical mineral.There are 4 genetic mechanismsin wenchang A depression.The calcspar deposit and remnantpotash feldspar by corrosionshow theroles of meteoric water on secondary porosity of fan delta.That confirmed corrosiontime of stage by oil and gas charging,acidichydrothermal solution by barite and rutile,CO2 corrosion by ferrodolomite deposit.Through the genetic mechanism,the results show the secondary pore development zone develop in the south fault zone and the No.6 fault zone.Those zone are the key exploration area in depp layer of Wenchang A depression.
出处
《内蒙古石油化工》
CAS
2017年第5期1-4,共4页
Inner Mongolia Petrochemical Industry
基金
国家重大专项子课题[2016ZX05024-007]南海西部海域低渗油藏勘探开发关键技术资助
关键词
文昌A凹陷
珠海组
次生孔隙
形成机制
Genetic Mechanism
Secondary Pore
Zhuhai Formation
Wenchang A Depression
