摘要
东营凹陷由高矿化度地层水引起的低电阻率油层在所发现的低阻油层中占较大的比例。分析了东营凹陷高矿化度地层水的来源及运移动力。目前地层中地层水的化学特性是地理、地质环境变迁导致的地下水动力场和化学场经漫长、复杂演化的结果。油层中地层水的化学特性可能等同于临近水层的化学特性,当地层水与其宿主岩的形成时间不同时,就可能与之完全不同。沉积盆地中的外来水可以来源于浅部或地表,重力是其运移的主要动力。也可以来源于深部,流体的高压是其运移的主要动力。邻近高压封存箱储层中的地层水的性质不仅取决于原生水还取决于来自深部地层的外来水以及油气在其中的富集程度。东营凹陷断裂构造带发育,在北坡、南坡和中央隆起带发育较多断至沙三中亚段、沙四段的大断层,它们有利于油气向上运移,同时也为深部高矿化度地层水的向上运移提供了通道,因此这些大的构造断裂附近的储层是有利的低电阻率油层分布带。
Among found low-resistivity pays in Dongying Sag, the low-resistivity pays of high formation water salinity took relatively major proportion. The source and migration dynamics of high formation water salinity in Dongying Depression were analyzed. The chemical property of formation water at present is the outcome of long and complex evolvements of underground hydrodynamic and chemical fields caused by geographical and geologic environmental transitions. The chemical property of formation water in oil layer might be equal to that of adjacent water layer. When the formation period of formation water is different to its host rock, its chemical property in oil layer may be entirely different to adjacent water layer. Extraneous water in sediment basin may come from upper stratum or the earth's surface, the gravitation is its primary migration dynamics; also comes from beneath stratum, the high fluid pressure its primary migration dynamics. The formation water property adjacent to high pressure compartment not only lies on primary water, also the enrichment degree of extraneous water and hydrocarbon from beneath stratum. In Dongying Depression rupture structural zone, there are many large faults extending to the middle members of Es3 or Es4 in the northern slope, southern slope and middle uplift belt, they are in favor of upward hydrocarbon migration, at the same time offer upward channels for the beneath high salinity formation water, therefore low-resistivity pays mostly distribute over vicinal reservoirs of these large structural faults.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2007年第3期39-41,共3页
Journal of Oil and Gas Technology
基金
中国石油化工股份有限公司"十五"科技攻关项目(P04020)
关键词
低电阻率油层
东营凹陷
油气运移
压力封存箱
高矿化度地层水
Dongying Depression
hydrocarbon migration
pressure compartment
low-resistivity pays
high formation water salinity
distributional rule
