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刘中春 《大庆石油地质与开发》2015,34(2)
塔河缝洞型碳酸盐岩油藏属于古岩溶型底水油藏,投产17年来,标定采收率仅为15%,而老区自然递减率已超30%。分析此类油藏剩余油,明确提高采收率途径,是目前急待解决的技术难题。在目前地质认识条件下,自主研制了系列可视化缝洞组合物理模型,采用物理模拟实验与动静结合分析方法,揭示了剩余油形成的力学机制、主要赋存方式及分布特征。提出了缝洞型油藏当溶孔直径大于4mm时可忽略毛管力的作用,大于此界限的孔、缝中重力分异将起主要作用;明确了主要剩余油的赋存方式是洞顶剩余油、高导流通道屏蔽剩余油、充填多孔介质中残余油及连通不好的盲端油;并提出了针对不同类型剩余油的提高采收率技术途径,为塔河缝洞型油藏高效开发提供了理论依据。 相似文献
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THREE‐DIMENSIONAL SEISMIC GEOMORPHOLOGY OF PALEOKARST IN THE CRETACEOUS MACAÉ GROUP CARBONATES,CAMPOS BASIN,BRAZIL
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Three‐dimensional seismic data from an oilfield in the Campos Basin, SE Brazil, was used to characterize a karstified unconformity surface at the top of the Albian – Cenomanian Macaé Group. Macaé Group carbonates underwent intense karstification associated with subaerial exposure during a period of some 10 to 15 Ma resulting in the development of canyons, valleys, sinkholes and cave systems. The carbonates host commercial oil accumulations at a number of important oil fields. Understanding how the karstification process has affected the carbonates' reservoir properties is essential for future exploration, not only to improve recovery rates but also to avoid drilling‐related issues such as thief zones. In this context, this study aims to characterize the top‐Macaé Group paleokarst system by investigating the morphology of the associated reflectors recorded on seismic data, together with endokarst features in the underlying carbonate succession such as cave systems and collapse structures. The top‐Macaé Group seismic horizon can be divided into two principal geomorphological domains: highlands, characterized by abrupt relief with well‐developed erosional features; and lowlands, marked by a smoother topography. Collapse sinkholes occur in both domains and take the form of closed circular depressions. The study of endokarst features from an analysis of amplitude anomalies (bright spots) indicates the presence of heterogeneous cave systems. The interpreted data contributes to a better understanding of the spatial distribution of the paleokarst system in the Macaé Group carbonates and may assist with future hydrocarbon exploration in the Campos Basin. 相似文献
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针对四川盆地磨溪区块震旦系顶面古岩溶"微地貌"单元划分不系统、研究较为缺乏的问题,综合分析磨溪区块的三维地震资料和钻井资料,论证并选取下寒武统沧浪铺组内部海泛面作为震旦系灯影组的上覆标志面,采用印模法恢复了震旦系顶面的古岩溶地貌。在此基础上,借鉴地貌学的经典坡位分类,结合磨溪区块震旦系顶面古岩溶地貌的发育特征,建立了磨溪区块震旦系顶面古岩溶微地貌的发育模式。优选坡度、剖面曲率、相对高程和长宽比4个参数,厘定各参数定量表征的标准,结合沟谷提取的分析结果,将磨溪区块划分为8类古岩溶微地貌单元,明确了磨溪区块震旦系顶面不同微地貌单元的发育特征,分析了不同微地貌单元中垂向岩溶风化带及溶蚀孔洞层发育程度的差异。研究表明,磨溪区块可划分为陡坡、坡肩、坡脚、残丘、坡顶、坡底、洼地和沟谷8类古岩溶微地貌单元。其中,残丘、洼地、坡顶和坡底在平面上呈低长宽比的似圆状、不规则状;坡肩、陡坡、坡脚和沟谷呈条带状。从坡肩、坡脚到坡底,各微地貌单元中的地表岩溶带和垂直渗流带厚度明显减小,水平潜流带厚度增大。溶蚀孔洞层在水平潜流带中的发育程度大于地表岩溶带和垂直渗流带中的发育程度,且水平潜流带厚度越大的部位其溶蚀孔洞层的累计厚度越大。坡底是有利于溶蚀孔洞层发育的微地貌单元。 相似文献
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塔北哈拉哈塘地区奥陶系多个层位均发育岩溶缝洞型储层。对钻井岩心系统采样测试分析,总结了哈拉哈塘地区不同地层的岩石类型及其纵向组合发育特征。不同类型碳酸盐岩溶蚀试验研究发现,泥质含量及MgO含量对岩石可溶性具有影响,溶蚀强度为纯颗粒石灰岩 > >白云质灰岩 >白云岩 >泥灰岩。以此为基础进行层组划分,将奥陶系碳酸盐岩划分为2类3型5个亚型:一间房组及鹰一、二段为灰岩连续型层组,属强岩溶层组;良一段,鹰三、四段为灰岩夹云岩亚型,岩溶强度属中等;其余各层组溶蚀性较弱。实际钻井结果及地震剖面"串珠"发育情况统计认为,该区岩溶层组类型控制了缝洞型储层的发育。 相似文献
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鄂尔多斯盆地东南部古岩溶特征及对气藏的控制 总被引:1,自引:0,他引:1
鄂尔多斯盆地古岩溶主要发育在奥陶系马家沟组碳酸盐岩地层中,盆地东南部古岩溶普遍发育.根据马家沟组碳酸盐岩地层残余厚度,古岩溶地貌划分为岩溶台地、岩溶斜坡和岩溶盆地3种类型.据据岩心观察和薄片鉴定、岩心分析,岩溶斜坡孔隙裂缝发育,并有着良好的油气显示. 相似文献
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