摘要
对陆梁油田白垩系呼图壁河组低阻油层进行了研究,分析该区低电阻率油层的成因,认为粘土的附加导电性、束缚水饱和度高、构造幅度低及强润湿性是造成油气层电阻率低的重要原因,低阻油田的粘土矿物以伊/蒙混层、伊利石、蒙脱石、绿泥石为主,均呈薄膜状分布于砂粒周缘,膜厚2～5 μm,最厚可达10 μ m,油层具亲水性.这种含水粘膜极大地扩大了储集层中导电网络面积,它是导致白垩系呼图壁河组低阻油层成因的主要原因.由于不同含油气性储层中的烃类(石油沥青)含量、组成和性质不同,所反映的荧光和有机地化特征也不同,椐此本文应用地球化学方法中氯仿沥青'A'的含量、热解气相色谱的游离烃含量和总烃含量以及饱和烃色谱特征,结合储层荧光的发光强度、发光面积及分布特征对低阻油层、油水层、含油水层及水层进行了识别,在生产中取得了很好的效果.
This paper studies the origin of the low-resistivity reservoirs of Hutubihe Formation of Cretaceous in Luliang oilfield ,it is believed that additional conductivity of clays and highirreducible water saturation and low-amplitude of structures and strong wettability are the important causes of low resistivity of the reservoir. The clay minerals are dominated by illite interbedded with smectite (I/S) ,illite (I) ,smectite (S) and chlorite (ch) distributed around the belts of the sand by the clay membrane of 2～5μm thick with the thickest of 10μm, also the reservoir is hydrophilic. Conductive network area of the reservoir has been enlarged due to the existence of water-bearing clay membrane which is the main cause of low resistivity of Hutubihe Formation reservoirs. Characteristics of hydrocarbon-bearing reservoirs vary because the hydrocarbon content (petroleum bitumen), composition and property of the reservoir are different, as well as the reflection of the fluorescence and the organic geochemistry characteristics. Low- resistivity oil zones, water-bearing oil zones, oil-water zones and aquifers have been identified by organic geochemistry means i.e. according to chloroform bitumen“A”content of the reservoir, free hydrocarbon content and the total hydrocarbon content of pyrolysis gas chromatography, and the chromatographic characteristics of saturated hydrocarbon combined with radiation strength of the fluorescent, radiation area of the fluorescent and its distribution characteristics, which has gained good effect in production. The results show that for a oil zone, chloroform bitumen“A” content of the reservoir is the highest, pores of the reservoir is abundance, restraining mass is little, fluorescence is bright-light, the radiation area of fluorescent is relatively large with homogeneous distribution. For a water-bearing oil zone, Chloroform bitumen“A” content of the reservoir is relative high, pore of the reservoir is abundance, restraining mass is moderate, and the radiation strength of fluorescent is middle bright-bright . For an oil-bearing aquifer, chloroform bitumen“A” content of the reservoir is very little, the radiation area of fluorescent is small, and the radiation strength of fluorescent is weak. For an aquifer, the carbon number of saturated hydrocarbon is small ranging from C14 to C20,without the fluorescence or with weak fluorescence.
出处
《新疆地质》
CAS
CSCD
2003年第3期325-328,共4页
Xinjiang Geology
关键词
陆梁油田
低阻油层
氯仿沥青
荧光
油层成因
Luliang oil field
Low-resistivity reservoirs
Origin
Chloroform bitumen“A”
Fluorescence
