蚀变对中基性火山岩储层的控制作用:以松辽盆地徐家围子断陷下白垩统营城组为例  

Controlling of alteration on intermediate and basic volcanic reservoirs:a case study of Lower Cretaceous Yingcheng Formation of Xujiaweizi fault depression,Songliao Basin

作　　者：魏翔宇[1] 高有峰[2] 魏琴 孙松[1] 印长海[4] 刘家军[4] 陈桐[1] 王璞珺[1] WEI Xiang-yu GAO You-feng WEI Qin SUN Song YIN Chang-hai LIU Jia-jun CHEN Tong WANG Pu-jun(College of Earth Sciences, Jilin University, Changchun 130061, China Research Center of Paleontology and Stratigraphy, Jilin University, Changchun 130026, China No.1 Middle School in Nanping, Nanping 353000, Fujian, China Institute of Exploration and Development of Daqing Oilfield Company Ltd, Daqing 163712, Heilongjiang, China)

机构地区：[1]吉林大学地球科学学院,长春130061 [2]吉林大学生物学与地层学研究中心,长春130026 [3]福建省南平第一中学,福建南平353000 [4]中国石油大庆油田公司勘探开发研究院,黑龙江大庆163712

出　　处：《世界地质》2017年第2期541-551,共11页World Geology

基　　金：国家重点基础研究发展计划"973"项目(2012CB822002);国家自然科学基金项目(41202072);中国地质调查局油气基础性公益性地质调查项目(DD20160207-06)联合资助

摘　　要：利用岩芯、薄片和扫描电镜等资料,综合分析松辽盆地徐家围子断陷下白垩统营城组火山岩储集空间类型和火山岩蚀变控制因素。依据化学蚀变指数(CIA)、黏土矿物测试和岩石矿物特征,将蚀变程度划分为弱蚀变(CIA<50)、中蚀变(50<CIA<60)、强蚀变(CIA>60)三种。与蚀变作用有关的成岩作用类型包括:脱玻化作用、溶蚀作用及充填作用。研究结果表明,随着蚀变程度提升,基质脱玻化作用和岩石黏土矿化作用越强,次生孔隙越发育;脱玻化作用和溶蚀作用具明显改善储层物性特征,充填作用虽然降低储层物性,但黏土矿物充填物中存在晶间微孔,仍具有一定储集性能。Reservoir space types and controlling factors of alteration of Yingcheng Formation volcanic rocks in Xujiaweizi depression were studied by core data, thin sections and scanning electric microscope. Based on chemical alteration index （CIA）, clay mineral test and rock mineral characteristics, the intensity of alteration is divided into three types： weak alteration（CIA〈50）, moderate alteration（50〈 CIA〈 60）and strong alteration（CIA〉60）. The types of diagenesis related to alteration include： devitrification, dissolution and filling. It is indicated from this research that more secondary pores were developed with the increasing of alteration intensity, devitrification of matrix and clay mineralization of rocks. Devitrification and dissolution can also improve the reservoir properties. Although cavity filling apparently reduced the reservoir properties, there are intergranular micropores in the infilling of clay minerals, which still has a certain reservoir performance.

关 键 词：松辽盆地 徐家围子断陷 下白垩统 营城组 中基性火山岩储层 蚀变 

分 类 号：P588.14[天文地球—岩石学] P618.130[天文地球—地质学]