摘要
依托地层水物理、化学性质分析等技术,对姬塬地区延长组长8油层组地层水分布规律与油藏关系进行了详细研究。结果表明,姬塬地区长8油层组地层水属常规油田水,水型主要为CaCl2型,矿化度在平面上呈现两边低中间高、南北向带状分布的特点;钠氯系数整体呈现西高东低的分布特征,该格局分布主要受盆地西缘冲断带及天环坳陷构造背景控制。同时根据油气包裹体氢、氧同位素测试结果分析认为,研究区内沉积水具有混合流体的特点,说明姬塬地区油气流体运移时有地表水渗入,早期油藏封闭性较差。
Based on the techniques of physical and chemical property analysis of formation water,the distribution rules of formation water and the relationships between formation water and reservoirs of Chang 8Reservoir Group in Yanchang Formation of Jiyuan Area were studied in detail.The results show that the formation water in the studied area belongs to conventional water of oilfields,calcium chloride is the main type of water,the water salinity is higher contents in plane but lower on both sides,presents banded distribution from south to north.Coefficient of sodium and chlorine presents higher in the west and lower in the east.The distributive pattern is controlled by the faulted zone in the western margin and Tianhuan Depression structure.According to analytical result of isotope of hydrogen and oxygen from inclusion of oil and gas,it is indicated that the sedimentation water presents characters of mixed flow,which indicates there exists some water coming from the earths surface in oil migration,and reservoir sealing property is poor at the early stage.
出处
《石油天然气学报》
CAS
CSCD
2014年第2期45-49,5-6,共5页
Journal of Oil and Gas Technology
基金
国家科技重大专项(2011ZX05044
2011ZX05001-004)
关键词
地层水
油藏
油气包裹体
姬塬地区
鄂尔多斯盆地
formation water
oil reservoir
oil and gas inclusion
Jiyuan Area
Ordos Basin
