摘要
在拉张的地质背景下,高束缚水成因的低电阻率油层形成于弱水动力变化带,水动力的强弱变化形成特殊的储集层岩性叠置结构(即不同的岩性按一定比例关系形成薄互层),形成由微孔隙与大孔隙构成双组孔隙系统的油层微观组构,油层高含束缚水因而电阻率低,但其中较大孔隙储集可动油气,具备产能。以沉积相研究为指导,从沉积相、储集层岩性结构及储集层微观组构这3个尺度进行研究,有助于在弱水动力变化带寻找高束缚水成因的低电阻率油层。运用这一方法研究了大港油田港东开发区某断块,数口井见到增油效果。
Under an extensional geological condition, low resistivity oil zone caused by high irreducible water saturation is formed in weak and unstable water dynamic areas where the change of water dynamic results in special reservoir lithological structure. The micro-pores and macro-pores make up the dual-porosity pore system. The resisitivity is low because of the high irreducible water saturation, but the macro-pores accumulate mobile oil and gas. Based on the three standards as reservoir microscopic structure, reservoir lithological structure and sedimentary facies distribution, the distribution of low resistivity oil zone can be forecasted by the research on sedimentary facies. Improved yield has been achieved in several wells of Dagang Oilfield.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2005年第2期123-125,共3页
Petroleum Exploration and Development
关键词
束缚水
低电阻率油层
沉积相
储集层岩性结构
微观组构
irreducible water
low resistivity oil zone
sedimentary facies
reservoir lithiological structure
microscopic structure
